Merge branch '6469-issue-board-milestone-lists' into 'master'

Resolve "Issue board milestone lists"

Closes #6469

See merge request gitlab-org/gitlab-ee!6615

app/assets/javascripts/boards/components/board_list.vue

@@ -112,12 +112,20 @@ export default {
           if (e.target) {
             const containerEl = e.target.closest('.js-board-list') || e.target.querySelector('.js-board-list');
             const toBoardType = containerEl.dataset.boardType;
+            const cloneActions = {
+              label: ['milestone', 'assignee'],
+              assignee: ['milestone', 'label'],
+              milestone: ['label', 'assignee'],
+            };
 
             if (toBoardType) {
               const fromBoardType = this.list.type;
+              // For each list we check if the destination list is
+              // a the list were we should clone the issue
+              const shouldClone = Object.entries(cloneActions).some(entry => (
+                 fromBoardType === entry[0] && entry[1].includes(toBoardType)));
 
-              if ((fromBoardType === 'assignee' && toBoardType === 'label') ||
-                  (fromBoardType === 'label' && toBoardType === 'assignee')) {
+              if (shouldClone) {
                 return 'clone';
               }
             }

app/assets/javascripts/boards/components/board_new_issue.vue

@@ -50,11 +50,14 @@ export default {
 
       const labels = this.list.label ? [this.list.label] : [];
       const assignees = this.list.assignee ? [this.list.assignee] : [];
+      const milestone = this.list.milestone ? this.list.milestone : null;
+
       const issue = new ListIssue({
         title: this.title,
         labels,
         subscribed: true,
         assignees,
+        milestone,
         project_id: this.selectedProject.id,
       });
 

app/assets/javascripts/boards/models/issue.js

@@ -27,7 +27,6 @@ class ListIssue {
     this.referencePath = obj.reference_path;
     this.path = obj.real_path;
     this.toggleSubscriptionEndpoint = obj.toggle_subscription_endpoint;
-    this.milestone_id = obj.milestone_id;
     this.project_id = obj.project_id;
 
     if (obj.project) {
@@ -36,6 +35,7 @@ class ListIssue {
 
     if (obj.milestone) {
       this.milestone = new ListMilestone(obj.milestone);
+      this.milestone_id = obj.milestone.id;
     }
 
     obj.labels.forEach((label) => {
@@ -85,6 +85,19 @@ class ListIssue {
     this.assignees = [];
   }
 
+  addMilestone (milestone) {
+    const miletoneId = this.milestone ? this.milestone.id : null;
+    if (milestone.id !== miletoneId) {
+      this.milestone = new ListMilestone(milestone);
+    }
+  }
+
+  removeMilestone (removeMilestone) {
+    if (removeMilestone && removeMilestone.id === this.milestone.id) {
+      this.milestone = {};
+    }
+  }
+
   getLists () {
     return gl.issueBoards.BoardsStore.state.lists.filter(list => list.findIssue(this.id));
   }

app/assets/javascripts/boards/models/list.js

@@ -4,6 +4,7 @@
 import ListLabel from '~/vue_shared/models/label';
 import ListAssignee from '~/vue_shared/models/assignee';
 import queryData from '../utils/query_data';
+import ListMilestone from './milestone';
 
 const PER_PAGE = 20;
 
@@ -49,6 +50,9 @@ class List {
     } else if (obj.user) {
       this.assignee = new ListAssignee(obj.user);
       this.title = this.assignee.name;
+    } else if (obj.milestone) {
+      this.milestone = new ListMilestone(obj.milestone);
+      this.title = this.milestone.title;
     }
 
     if (!typeInfo.isBlank && this.id) {
@@ -67,12 +71,14 @@ class List {
   }
 
   save() {
-    const entity = this.label || this.assignee;
+    const entity = this.label || this.assignee || this.milestone;
     let entityType = '';
     if (this.label) {
       entityType = 'label_id';
-    } else {
+    } else if (this.assignee) {
       entityType = 'assignee_id';
+    } else if (this.milestone) {
+      entityType = 'milestone_id';
     }
 
     return gl.boardService
@@ -187,6 +193,13 @@ class List {
         issue.addAssignee(this.assignee);
       }
 
+      if (this.milestone) {
+        if (listFrom && listFrom.type === 'milestone') {
+          issue.removeMilestone(listFrom.milestone);
+        }
+        issue.addMilestone(this.milestone);
+      }
+
       if (listFrom) {
         this.issuesSize += 1;
 

app/assets/javascripts/boards/models/milestone.js

-class ListMilestone {
+export default class ListMilestone {
   constructor(obj) {
     this.id = obj.id;
     this.title = obj.title;
+    this.path = obj.path;
+    this.state = obj.state;
+    this.webUrl = obj.web_url || obj.webUrl;
+    this.description = obj.description;
   }
 }
 

app/assets/javascripts/boards/stores/boards_store.js

@@ -126,6 +126,16 @@ gl.issueBoards.BoardsStore = {
         issue.findAssignee(listTo.assignee)) {
         const targetIssue = listTo.findIssue(issue.id);
         targetIssue.removeAssignee(listFrom.assignee);
+      } else if (listTo.type === 'milestone') {
+        const currentMilestone = issue.milestone;
+        const currentLists = this.state.lists
+            .filter(list => (list.type === 'milestone' && list.id !== listTo.id))
+            .filter(list => list.issues.some(listIssue => issue.id === listIssue.id));
+
+        issue.removeMilestone(currentMilestone);
+        issue.addMilestone(listTo.milestone);
+        currentLists.forEach(currentList => currentList.removeIssue(issue));
+        listTo.addIssue(issue, listFrom, newIndex);
       } else {
         // Add to new lists issues if it doesn't already exist
         listTo.addIssue(issue, listFrom, newIndex);
@@ -143,6 +153,9 @@ gl.issueBoards.BoardsStore = {
     } else if (listTo.type === 'backlog' && listFrom.type === 'assignee') {
       issue.removeAssignee(listFrom.assignee);
       listFrom.removeIssue(issue);
+    } else if (listTo.type === 'backlog' && listFrom.type === 'milestone') {
+      issue.removeMilestone(listFrom.milestone);
+      listFrom.removeIssue(issue);
     } else if (this.shouldRemoveIssue(listFrom, listTo)) {
       listFrom.removeIssue(issue);
     }
@@ -162,7 +175,7 @@ gl.issueBoards.BoardsStore = {
   },
   findList (key, val, type = 'label') {
     const filteredList = this.state.lists.filter((list) => {
-      const byType = type ? (list.type === type) || (list.type === 'assignee') : true;
+      const byType = type ? (list.type === type) || (list.type === 'assignee') || (list.type === 'milestone') : true;
 
       return list[key] === val && byType;
     });

app/models/list.rb

@@ -6,7 +6,7 @@ class List < ActiveRecord::Base
   belongs_to :board
   belongs_to :label
 
-  enum list_type: { backlog: 0, label: 1, closed: 2, assignee: 3 }
+  enum list_type: { backlog: 0, label: 1, closed: 2, assignee: 3, milestone: 4 }
 
   validates :board, :list_type, presence: true
   validates :label, :position, presence: true, if: :label?
@@ -29,11 +29,11 @@ class List < ActiveRecord::Base
   end
 
   def destroyable?
-    label?
+    self.class.destroyable_types.include?(list_type&.to_sym)
   end
 
   def movable?
-    label?
+    self.class.movable_types.include?(list_type&.to_sym)
   end
 
   def title

app/views/shared/boards/components/_board.html.haml

@@ -6,12 +6,13 @@
         %i.fa.fa-fw.board-title-expandable-toggle{ "v-if": "list.isExpandable",
           ":class": "{ \"fa-caret-down\": list.isExpanded, \"fa-caret-right\": !list.isExpanded }",
           "aria-hidden": "true" }
+        = render_if_exists "shared/boards/components/list_milestone"
 
         %a.user-avatar-link.js-no-trigger{ "v-if": "list.type === \"assignee\"", ":href": "list.assignee.path" }
           -# haml-lint:disable AltText
           %img.avatar.s20.has-tooltip{ height: "20", width: "20", ":src": "list.assignee.avatar", ":alt": "list.assignee.name" }
 
-        %span.board-title-text.has-tooltip{ "v-if": "list.type !== \"label\"",
+        %span.board-title-text.has-tooltip.block-truncated{ "v-if": "list.type !== \"label\"",
           ":title" => '((list.label && list.label.description) || list.title || "")', data: { container: "body" } }
           {{ list.title }}
 

config/routes.rb

@@ -81,6 +81,7 @@ Rails.application.routes.draw do
       resources :issues, module: :boards, only: [:index, :update]
 
       resources :users, module: :boards, only: [:index]
+      resources :milestones, module: :boards, only: [:index]
     end
 
     # UserCallouts

db/schema.rb

@@ -33,19 +33,19 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.string "logo"
     t.integer "updated_by"
     t.string "header_logo"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
     t.text "description_html"
     t.integer "cached_markdown_version"
     t.text "new_project_guidelines"
     t.text "new_project_guidelines_html"
-    t.string "favicon"
     t.text "header_message"
     t.text "header_message_html"
     t.text "footer_message"
     t.text "footer_message_html"
     t.text "message_background_color"
     t.text "message_font_color"
+    t.string "favicon"
   end
 
   create_table "application_setting_terms", force: :cascade do |t|
@@ -191,14 +191,14 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.integer "gitaly_timeout_medium", default: 30, null: false
     t.integer "gitaly_timeout_fast", default: 10, null: false
     t.boolean "mirror_available", default: true, null: false
-    t.string "auto_devops_domain"
     t.integer "default_project_creation", default: 2, null: false
+    t.string "auto_devops_domain"
     t.boolean "external_authorization_service_enabled", default: false, null: false
     t.string "external_authorization_service_url"
     t.string "external_authorization_service_default_label"
     t.boolean "pages_domain_verification_enabled", default: true, null: false
-    t.float "external_authorization_service_timeout", default: 0.5, null: false
     t.boolean "allow_local_requests_from_hooks_and_services", default: false, null: false
+    t.float "external_authorization_service_timeout", default: 0.5
     t.text "external_auth_client_cert"
     t.text "encrypted_external_auth_client_key"
     t.string "encrypted_external_auth_client_key_iv"
@@ -468,8 +468,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.string "encrypted_value_iv"
     t.integer "group_id", null: false
     t.boolean "protected", default: false, null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
   end
 
   add_index "ci_group_variables", ["group_id", "key"], name: "index_ci_group_variables_on_group_id_and_key", unique: true, using: :btree
@@ -508,8 +508,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.string "encrypted_value_salt"
     t.string "encrypted_value_iv"
     t.integer "pipeline_schedule_id", null: false
-    t.datetime "created_at"
-    t.datetime "updated_at"
+    t.datetime_with_timezone "created_at"
+    t.datetime_with_timezone "updated_at"
   end
 
   add_index "ci_pipeline_schedule_variables", ["pipeline_schedule_id", "key"], name: "index_ci_pipeline_schedule_variables_on_schedule_id_and_key", unique: true, using: :btree
@@ -897,8 +897,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.datetime "created_at"
     t.datetime "updated_at"
     t.string "confirmation_token"
-    t.datetime_with_timezone "confirmed_at"
-    t.datetime_with_timezone "confirmation_sent_at"
+    t.datetime "confirmed_at"
+    t.datetime "confirmation_sent_at"
   end
 
   add_index "emails", ["confirmation_token"], name: "index_emails_on_confirmation_token", unique: true, using: :btree
@@ -969,8 +969,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.integer "project_id"
     t.integer "author_id", null: false
     t.integer "target_id"
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
     t.integer "action", limit: 2, null: false
     t.string "target_type"
   end
@@ -1262,8 +1262,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
   add_index "gpg_key_subkeys", ["keyid"], name: "index_gpg_key_subkeys_on_keyid", unique: true, using: :btree
 
   create_table "gpg_keys", force: :cascade do |t|
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
     t.integer "user_id"
     t.binary "primary_keyid"
     t.binary "fingerprint"
@@ -1275,8 +1275,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
   add_index "gpg_keys", ["user_id"], name: "index_gpg_keys_on_user_id", using: :btree
 
   create_table "gpg_signatures", force: :cascade do |t|
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
     t.integer "project_id"
     t.integer "gpg_key_id"
     t.binary "commit_sha"
@@ -1540,10 +1540,12 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.datetime "created_at", null: false
     t.datetime "updated_at", null: false
     t.integer "user_id"
+    t.integer "milestone_id"
   end
 
   add_index "lists", ["board_id", "label_id"], name: "index_lists_on_board_id_and_label_id", unique: true, using: :btree
   add_index "lists", ["label_id"], name: "index_lists_on_label_id", using: :btree
+  add_index "lists", ["milestone_id"], name: "index_lists_on_milestone_id", using: :btree
   add_index "lists", ["user_id"], name: "index_lists_on_user_id", using: :btree
 
   create_table "members", force: :cascade do |t|
@@ -1664,6 +1666,7 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.text "title_html"
     t.text "description_html"
     t.integer "time_estimate"
+    t.boolean "squash", default: false, null: false
     t.integer "cached_markdown_version"
     t.datetime "last_edited_at"
     t.integer "last_edited_by_id"
@@ -1671,7 +1674,6 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.string "merge_jid"
     t.boolean "discussion_locked"
     t.integer "latest_merge_request_diff_id"
-    t.boolean "squash", default: false, null: false
     t.boolean "allow_maintainer_to_push"
   end
 
@@ -1983,8 +1985,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
 
   create_table "project_auto_devops", force: :cascade do |t|
     t.integer "project_id", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
     t.boolean "enabled"
     t.string "domain"
     t.integer "deploy_strategy", default: 0, null: false
@@ -2062,9 +2064,9 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.datetime "next_execution_timestamp"
     t.string "status"
     t.string "jid"
+    t.text "last_error"
     t.datetime_with_timezone "last_update_at"
     t.datetime_with_timezone "last_successful_update_at"
-    t.text "last_error"
   end
 
   add_index "project_mirror_data", ["jid"], name: "index_project_mirror_data_on_jid", using: :btree
@@ -2170,10 +2172,10 @@ ActiveRecord::Schema.define(version: 20180803001726) do
     t.boolean "only_mirror_protected_branches"
     t.boolean "pull_mirror_available_overridden"
     t.integer "jobs_cache_index"
-    t.boolean "mirror_overwrites_diverged_branches"
     t.string "external_authorization_classification_label"
-    t.string "external_webhook_token"
+    t.boolean "mirror_overwrites_diverged_branches"
     t.boolean "pages_https_only", default: true
+    t.string "external_webhook_token"
   end
 
   add_index "projects", ["ci_id"], name: "index_projects_on_ci_id", using: :btree
@@ -2213,15 +2215,15 @@ ActiveRecord::Schema.define(version: 20180803001726) do
   add_index "prometheus_alerts", ["prometheus_metric_id"], name: "index_prometheus_alerts_on_prometheus_metric_id", unique: true, using: :btree
 
   create_table "prometheus_metrics", force: :cascade do |t|
-    t.integer "project_id"
+    t.integer "project_id", null: false
     t.string "title", null: false
     t.string "query", null: false
     t.string "y_label"
     t.string "unit"
     t.string "legend"
     t.integer "group", null: false
-    t.datetime "created_at", null: false
-    t.datetime "updated_at", null: false
+    t.datetime_with_timezone "created_at", null: false
+    t.datetime_with_timezone "updated_at", null: false
   end
 
   add_index "prometheus_metrics", ["group"], name: "index_prometheus_metrics_on_group", using: :btree
@@ -2685,8 +2687,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
   add_index "user_callouts", ["user_id"], name: "index_user_callouts_on_user_id", using: :btree
 
   create_table "user_custom_attributes", force: :cascade do |t|
-    t.datetime_with_timezone "created_at", null: false
-    t.datetime_with_timezone "updated_at", null: false
+    t.datetime "created_at", null: false
+    t.datetime "updated_at", null: false
     t.integer "user_id", null: false
     t.string "key", null: false
     t.string "value", null: false
@@ -2942,10 +2944,10 @@ ActiveRecord::Schema.define(version: 20180803001726) do
   add_foreign_key "cluster_providers_gcp", "clusters", on_delete: :cascade
   add_foreign_key "clusters", "users", on_delete: :nullify
   add_foreign_key "clusters_applications_helm", "clusters", on_delete: :cascade
-  add_foreign_key "clusters_applications_ingress", "clusters", name: "fk_753a7b41c1", on_delete: :cascade
+  add_foreign_key "clusters_applications_ingress", "clusters", on_delete: :cascade
   add_foreign_key "clusters_applications_jupyter", "clusters", on_delete: :cascade
   add_foreign_key "clusters_applications_jupyter", "oauth_applications", on_delete: :nullify
-  add_foreign_key "clusters_applications_prometheus", "clusters", name: "fk_557e773639", on_delete: :cascade
+  add_foreign_key "clusters_applications_prometheus", "clusters", on_delete: :cascade
   add_foreign_key "clusters_applications_runners", "ci_runners", column: "runner_id", name: "fk_02de2ded36", on_delete: :nullify
   add_foreign_key "clusters_applications_runners", "clusters", on_delete: :cascade
   add_foreign_key "container_repositories", "projects"
@@ -3017,6 +3019,7 @@ ActiveRecord::Schema.define(version: 20180803001726) do
   add_foreign_key "lfs_file_locks", "users", on_delete: :cascade
   add_foreign_key "lists", "boards", name: "fk_0d3f677137", on_delete: :cascade
   add_foreign_key "lists", "labels", name: "fk_7a5553d60f", on_delete: :cascade
+  add_foreign_key "lists", "milestones", on_delete: :cascade
   add_foreign_key "lists", "users", name: "fk_d6cf4279f7", on_delete: :cascade
   add_foreign_key "members", "users", name: "fk_2e88fb7ce9", on_delete: :cascade
   add_foreign_key "merge_request_diff_commits", "merge_request_diffs", on_delete: :cascade
@@ -3111,8 +3114,8 @@ ActiveRecord::Schema.define(version: 20180803001726) do
   add_foreign_key "u2f_registrations", "users"
   add_foreign_key "user_callouts", "users", on_delete: :cascade
   add_foreign_key "user_custom_attributes", "users", on_delete: :cascade
-  add_foreign_key "user_interacted_projects", "projects", name: "fk_722ceba4f7", on_delete: :cascade
-  add_foreign_key "user_interacted_projects", "users", name: "fk_0894651f08", on_delete: :cascade
+  add_foreign_key "user_interacted_projects", "projects", on_delete: :cascade
+  add_foreign_key "user_interacted_projects", "users", on_delete: :cascade
   add_foreign_key "user_statuses", "users", on_delete: :cascade
   add_foreign_key "user_synced_attributes_metadata", "users", on_delete: :cascade
   add_foreign_key "users", "application_setting_terms", column: "accepted_term_id", name: "fk_789cd90b35", on_delete: :cascade

ee/app/assets/javascripts/boards/components/assignees_list_slector.js

+import BoardsListSelector from './boards_list_selector/index';
+
+export default function () {
+  const $addListEl = document.querySelector('#js-add-list');
+  return new BoardsListSelector({
+    propsData: {
+      listPath: $addListEl.querySelector('.js-new-board-list').dataset.listAssigneesPath,
+      listType: 'assignees',
+    },
+  }).$mount('.js-assignees-list');
+}

ee/app/assets/javascripts/boards/components/assignees_list/assignees_list_item.vue → ee/app/assets/javascripts/boards/components/boards_list_selector/assignees_list_item.vue

@@ -3,7 +3,7 @@ import { sprintf, __ } from '~/locale';
 
 export default {
   props: {
-    assignee: {
+    item: {
       type: Object,
       required: true,
     },
@@ -11,13 +11,13 @@ export default {
   computed: {
     avatarAltText() {
       return sprintf(__("%{name}'s avatar"), {
-        name: this.assignee.name,
+        name: this.item.name,
       });
     },
   },
   methods: {
     handleItemClick() {
-      this.$emit('onItemSelect', this.assignee);
+      this.$emit('onItemSelect', this.item);
     },
   },
 };
@@ -35,16 +35,16 @@ export default {
       <div class="avatar-container s32">
         <img
           :alt="avatarAltText"
-          :src="assignee.avatar_url"
+          :src="item.avatar_url"
           class="avatar s32 lazy"
         />
       </div>
       <div class="dropdown-user-details">
-        <div :title="assignee.name">{{ assignee.name }}</div>
+        <div :title="item.name">{{ item.name }}</div>
         <div
-          :title="assignee.username"
+          :title="item.username"
           class="dropdown-light-content"
-        >@{{ assignee.username }}</div>
+        >@{{ item.username }}</div>
       </div>
     </button>
   </li>

ee/app/assets/javascripts/boards/components/assignees_list/index.js → ee/app/assets/javascripts/boards/components/boards_list_selector/index.js

 import Vue from 'vue';
 import _ from 'underscore';
-import { __ } from '~/locale';
+import { __, sprintf } from '~/locale';
 import Flash from '~/flash';
 import axios from '~/lib/utils/axios_utils';
 
-import AssigneesListContainer from './assignees_list_container.vue';
+import ListContainer from './list_container.vue';
 
 export default Vue.extend({
   components: {
-    AssigneesListContainer,
+    ListContainer,
   },
   props: {
-    listAssigneesPath: {
+    listPath: {
+      type: String,
+      required: true,
+    },
+    listType: {
       type: String,
       required: true,
     },
@@ -23,43 +27,68 @@ export default Vue.extend({
     };
   },
   mounted() {
-    this.loadAssignees();
+    this.loadList();
   },
   methods: {
-    loadAssignees() {
-      if (this.store.state.assignees.length) {
+    loadList() {
+      if (this.store.state[this.listType].length) {
         return Promise.resolve();
       }
 
       return axios
-        .get(this.listAssigneesPath)
+        .get(this.listPath)
         .then(({ data }) => {
           this.loading = false;
-          this.store.state.assignees = data;
+          this.store.state[this.listType] = data;
         })
         .catch(() => {
           this.loading = false;
-          Flash(__('Something went wrong while fetching assignees list'));
+          Flash(sprintf(__('Something went wrong while fetching %{listType} list'), {
+            listType: this.listType,
+          }));
         });
     },
-    handleItemClick(assignee) {
-      if (!this.store.findList('title', assignee.name)) {
-        this.store.new({
-          title: assignee.name,
-          position: this.store.state.lists.length - 2,
-          list_type: 'assignee',
-          user: assignee,
+    filterItems(term, items) {
+      const query = term.toLowerCase();
+
+      return items.filter((item) => {
+        const name = item.name ? item.name.toLowerCase() : item.title.toLowerCase();
+        const foundName = name.indexOf(query) > -1;
+
+        if (this.listType === 'milestones') {
+          return foundName;
+        }
+
+        const username = item.username.toLowerCase();
+        return foundName || username.indexOf(query) > -1;
       });
+    },
+    handleItemClick(item) {
+      if (!this.store.findList('title', item.name)) {
+        const list = {
+          title: item.name,
+          position: this.store.state.lists.length - 2,
+          list_type: this.listType,
+        };
+
+        if (this.listType === 'milestones') {
+          list.milestone = item;
+        } else if (this.listType === 'assignees') {
+          list.user = item;
+        }
+
+        this.store.new(list);
 
         this.store.state.lists = _.sortBy(this.store.state.lists, 'position');
       }
     },
   },
   render(createElement) {
-    return createElement('assignees-list-container', {
+    return createElement('list-container', {
       props: {
         loading: this.loading,
-        assignees: this.store.state.assignees,
+        items: this.store.state[this.listType],
+        listType: this.listType,
       },
       on: {
         onItemSelect: this.handleItemClick,

ee/app/assets/javascripts/boards/components/assignees_list/assignees_list_container.vue → ee/app/assets/javascripts/boards/components/boards_list_selector/list_container.vue

 <script>
 import LoadingIcon from '~/vue_shared/components/loading_icon.vue';
 
-import AssigneesListFilter from './assignees_list_filter.vue';
-import AssigneesListContent from './assignees_list_content.vue';
+import ListFilter from './list_filter.vue';
+import ListContent from './list_content.vue';
 
 export default {
   components: {
     LoadingIcon,
-    AssigneesListFilter,
-    AssigneesListContent,
+    ListFilter,
+    ListContent,
   },
   props: {
     loading: {
       type: Boolean,
       required: true,
     },
-    assignees: {
+    items: {
       type: Array,
       required: true,
     },
+    listType: {
+      type: String,
+      required: true,
+    },
   },
   data() {
     return {
@@ -26,18 +30,18 @@ export default {
     };
   },
   computed: {
-    filteredAssignees() {
-      if (!this.query) {
-        return this.assignees;
-      }
+    filteredItems() {
+      if (!this.query) return this.items;
 
-      // fuzzaldrinPlus doesn't support filtering
-      // on multiple keys hence we're using plain JS.
       const query = this.query.toLowerCase();
-      return this.assignees.filter((assignee) => {
-        const name = assignee.name.toLowerCase();
-        const username = assignee.username.toLowerCase();
+      return this.items.filter((item) => {
+        const name = item.name ? item.name.toLowerCase() : item.title.toLowerCase();
+
+        if (this.listType === 'milestones') {
+          return name.indexOf(query) > -1;
+        }
 
+        const username = item.username.toLowerCase();
         return name.indexOf(query) > -1 || username.indexOf(query) > -1;
       });
     },
@@ -46,8 +50,8 @@ export default {
     handleSearch(query) {
       this.query = query;
     },
-    handleItemClick(assignee) {
-      this.$emit('onItemSelect', assignee);
+    handleItemClick(item) {
+      this.$emit('onItemSelect', item);
     },
   },
 };
@@ -61,12 +65,13 @@ export default {
     >
       <loading-icon />
     </div>
-    <assignees-list-filter
+    <list-filter
       @onSearchInput="handleSearch"
     />
-    <assignees-list-content
+    <list-content
       v-if="!loading"
-      :assignees="filteredAssignees"
+      :items="filteredItems"
+      :list-type="listType"
       @onItemSelect="handleItemClick"
     />
   </div>

ee/app/assets/javascripts/boards/components/assignees_list/assignees_list_content.vue → ee/app/assets/javascripts/boards/components/boards_list_selector/list_content.vue

 <script>
 import AssigneesListItem from './assignees_list_item.vue';
+import MilestoneListItem from './milestones_list_item.vue';
 
 export default {
-  components: {
-    AssigneesListItem,
-  },
   props: {
-    assignees: {
+    items: {
       type: Array,
       required: true,
     },
+    listType: {
+      type: String,
+      required: true,
+    },
+  },
+  computed: {
+    listContentComponent() {
+      return this.listType === 'assignees' ? AssigneesListItem : MilestoneListItem;
+    },
   },
   methods: {
-    handleItemClick(assignee) {
-      this.$emit('onItemSelect', assignee);
+    handleItemClick(item) {
+      this.$emit('onItemSelect', item);
     },
   },
 };
@@ -22,10 +29,11 @@ export default {
 <template>
   <div class="dropdown-content">
     <ul>
-      <assignees-list-item
-        v-for="assignee in assignees"
-        :key="assignee.id"
-        :assignee="assignee"
+      <component
+        v-for="item in items"
+        :is="listContentComponent"
+        :key="item.id"
+        :item="item"
         @onItemSelect="handleItemClick"
       />
     </ul>

ee/app/assets/javascripts/boards/components/boards_list_selector/milestones_list_item.vue

+<script>
+export default {
+  props: {
+    item: {
+      type: Object,
+      required: true,
+    },
+  },
+  methods: {
+    handleItemClick() {
+      this.$emit('onItemSelect', this.item);
+    },
+  },
+};
+</script>
+
+<template>
+  <li
+    class="filter-dropdown-item"
+    @click="handleItemClick"
+  >
+    <button
+      class="btn btn-link dropdown-user"
+      type="button"
+    >
+      <div class="dropdown-user-details">
+        <div :title="item.title">{{ item.title }}</div>
+      </div>
+    </button>
+  </li>
+</template>

ee/app/assets/javascripts/boards/components/boards_selector.js

@@ -3,7 +3,8 @@ import $ from 'jquery';
 import { throttle } from 'underscore';
 import '~/boards/stores/boards_store';
 import BoardForm from './board_form.vue';
-import AssigneesList from './assignees_list';
+import AssigneeList from './assignees_list_slector';
+import MilestoneList from './milestone_list_selector';
 
 (() => {
   window.gl = window.gl || {};
@@ -38,12 +39,14 @@ import AssigneesList from './assignees_list';
         loading: true,
         hasScrollFade: false,
         hasAssigneesListMounted: false,
+        hasMilestoneListMounted: false,
         scrollFadeInitialized: false,
         boards: [],
         state: Store.state,
         throttledSetScrollFade: throttle(this.setScrollFade, this.throttleDuration),
         contentClientHeight: 0,
         maxPosition: 0,
+        store: gl.issueBoards.BoardsStore,
       };
     },
     computed: {
@@ -84,6 +87,7 @@ import AssigneesList from './assignees_list';
     created() {
       this.state.currentBoard = this.currentBoard;
       Store.state.assignees = [];
+      Store.state.milestones = [];
       $('#js-add-list').on('hide.bs.dropdown', this.handleDropdownHide);
       $('.js-new-board-list-tabs').on('click', this.handleDropdownTabClick);
     },
@@ -146,13 +150,14 @@ import AssigneesList from './assignees_list';
         $addListEl.data('preventClose', true);
         if (e.target.dataset.action === 'tab-assignees' &&
             !this.hasAssigneesListMounted) {
-          this.assigneeList = new AssigneesList({
-            propsData: {
-              listAssigneesPath: $addListEl.find('.js-new-board-list').data('listAssigneesPath'),
-            },
-          }).$mount('.js-assignees-list');
+          this.assigneeList = AssigneeList();
           this.hasAssigneesListMounted = true;
         }
+
+        if (e.target.dataset.action === 'tab-milestones' && !this.hasMilestoneListMounted) {
+          this.milstoneList = MilestoneList();
+          this.hasMilestoneListMounted = true;
+        }
       },
     },
   });

ee/app/assets/javascripts/boards/components/milestone_list_selector.js

+import BoardsListSelector from './boards_list_selector';
+
+export default function () {
+  const $addListEl = document.querySelector('#js-add-list');
+  return new BoardsListSelector({
+    propsData: {
+      listPath: $addListEl.querySelector('.js-new-board-list').dataset.listMilestonePath,
+      listType: 'milestones',
+    },
+  }).$mount('.js-milestone-list');
+}

ee/app/assets/javascripts/boards/models/list.js

 /* eslint-disable no-param-reassign */
 import List from '~/boards/models/list';
 import ListAssignee from '~/vue_shared/models/assignee';
+import ListMilestone from '~/boards/models/milestone';
 
 const EE_TYPES = {
   promotion: {
@@ -47,7 +48,7 @@ class ListEE extends List {
   }
 
   onNewIssueResponse(issue, data) {
-    issue.milestone = data.milestone;
+    issue.milestone = data.milestone ? new ListMilestone(data.milestone) : data.milestone;
     issue.assignees = Array.isArray(data.assignees)
       ? data.assignees.map(assignee => new ListAssignee(assignee))
       : data.assignees;

ee/app/assets/stylesheets/pages/boards.scss

@@ -12,7 +12,7 @@
 
 .dropdown .dropdown-menu.dropdown-menu-tabs {
   padding-top: 0;
-  width: 240px;
+  min-width: 240px;
 
   .dropdown-tabs-list {
     display: flex;

ee/app/controllers/boards/milestones_controller.rb

+module Boards
+  class MilestonesController < Boards::ApplicationController
+    def index
+      milestones_finder = Boards::MilestonesFinder.new(board, current_user)
+
+      render json: MilestoneSerializer.new.represent(milestones_finder.execute)
+    end
+  end
+end

ee/app/controllers/ee/boards/lists_controller.rb

@@ -5,12 +5,12 @@ module EE
 
       override :list_creation_attrs
       def list_creation_attrs
-        super + %i[assignee_id]
+        super + %i[assignee_id milestone_id]
       end
 
       override :serialization_attrs
       def serialization_attrs
-        super.merge(user: true)
+        super.merge(user: true, milestone: true)
       end
     end
   end

ee/app/finders/boards/milestones_finder.rb

+module Boards
+  class MilestonesFinder
+    def initialize(board, current_user = nil)
+      @board = board
+      @current_user = current_user
+    end
+
+    def execute
+      finder_service.execute
+    end
+
+    private
+
+    def finder_service
+      parent = @board.parent
+
+      finder_params =
+        if parent.is_a?(Group)
+          {
+            group_ids: parent.self_and_ancestors
+          }
+        else
+          {
+            project_ids: [parent.id],
+            group_ids: parent.group&.self_and_ancestors
+          }
+        end
+
+      ::MilestonesFinder.new(finder_params)
+    end
+  end
+end

ee/app/helpers/ee/boards_helper.rb

@@ -8,7 +8,8 @@ module EE
 
     override :board_list_data
     def board_list_data
-      super.merge(list_assignees_path: board_users_path(board, :json))
+      super.merge(list_milestone_path: board_milestones_path(board, :json),
+                  list_assignees_path: board_users_path(board, :json))
     end
 
     override :board_data

ee/app/models/ee/list.rb

@@ -10,31 +10,34 @@ module EE
       end
 
       base.belongs_to :user
+      base.belongs_to :milestone
 
       base.validates :user, presence: true, if: :assignee?
+      base.validates :milestone, presence: true, if: :milestone?
       base.validates :user_id, uniqueness: { scope: :board_id }, if: :assignee?
+      base.validates :milestone_id, uniqueness: { scope: :board_id }, if: :milestone?
       base.validates :list_type,
-        exclusion: { in: %w[assignee], message: _('Assignee boards not available with your current license') },
+        exclusion: { in: %w[assignee], message: _('Assignee lists not available with your current license') },
         unless: -> { board&.parent&.feature_available?(:board_assignee_lists) }
+      base.validates :list_type,
+        exclusion: { in: %w[milestone], message: _('Milestone lists not available with your current license') },
+        unless: -> { board&.parent&.feature_available?(:board_milestone_lists) }
     end
 
     def assignee=(user)
       self.user = user
     end
 
-    override :destroyable?
-    def destroyable?
-      assignee? || super
-    end
-
-    override :movable?
-    def movable?
-      assignee? || super
-    end
-
     override :title
     def title
-      assignee? ? user.to_reference : super
+      case list_type
+      when 'assignee'
+        user.to_reference
+      when 'milestone'
+        milestone.title
+      else
+        super
+      end
     end
 
     override :as_json
@@ -43,16 +46,20 @@ module EE
         if options.key?(:user)
           json[:user] = UserSerializer.new.represent(user).as_json
         end
+
+        if options.key?(:milestone)
+          json[:milestone] = MilestoneSerializer.new.represent(milestone).as_json
+        end
       end
     end
 
     module ClassMethods
       def destroyable_types
-        super + [:assignee]
+        super + [:assignee, :milestone]
       end
 
       def movable_types
-        super + [:assignee]
+        super + [:assignee, :milestone]
       end
     end
   end

ee/app/models/license.rb

@@ -38,6 +38,7 @@ class License < ActiveRecord::Base
     admin_audit_log
     auditor_user
     board_assignee_lists
+    board_milestone_lists
     cross_project_pipelines
     email_additional_text
     db_load_balancing

ee/app/serializers/milestone_serializer.rb

+class MilestoneSerializer < BaseSerializer
+  entity API::Entities::Milestone
+end

ee/app/services/ee/boards/issues/create_service.rb

@@ -7,10 +7,12 @@ module EE
         override :issue_params
         def issue_params
           assignee_ids = Array(list.user_id || board.assignee&.id)
+          milestone_id = list.milestone_id || board.milestone_id
+
           {
             label_ids: [list.label_id, *board.label_ids],
             weight: board.weight,
-            milestone_id: board.milestone_id,
+            milestone_id: milestone_id,
             # This can be removed when boards have multiple assignee support.
             # See https://gitlab.com/gitlab-org/gitlab-ee/issues/3786
             assignee_ids: assignee_ids

ee/app/services/ee/boards/issues/list_service.rb

@@ -6,11 +6,19 @@ module EE
 
         override :filter
         def filter(issues)
-          issues = without_board_assignees(issues) unless list&.movable? || list&.closed?
-
-          return super unless list&.assignee?
+          unless list&.movable? || list&.closed?
+            issues = without_assignees_from_lists(issues)
+            issues = without_milestones_from_lists(issues)
+          end
 
+          case list&.list_type
+          when 'assignee'
             with_assignee(super)
+          when 'milestone'
+            with_milestone(super)
+          else
+            super
+          end
         end
 
         override :issues_label_links
@@ -24,30 +32,49 @@ module EE
 
         private
 
-        override :metadata_fields
-        def metadata_fields
-          super.merge(total_weight: 'COALESCE(SUM(weight), 0)')
+        def all_assignee_lists
+          if parent.feature_available?(:board_assignee_lists)
+            board.lists.assignee.where.not(user_id: nil)
+          else
+            ::List.none
+          end
         end
 
-        def board_assignee_ids
-          @board_assignee_ids ||=
-            if parent.feature_available?(:board_assignee_lists)
-              board.lists.movable.pluck(:user_id).compact
+        def all_milestone_lists
+          if parent.feature_available?(:board_milestone_lists)
+            board.lists.milestone.where.not(milestone_id: nil)
           else
-              []
+            ::List.none
           end
         end
 
-        def without_board_assignees(issues)
-          return issues unless board_assignee_ids.any?
+        def without_assignees_from_lists(issues)
+          return issues if all_assignee_lists.empty?
+
+          issues
+            .where.not(id: issues.joins(:assignees).where(users: { id: all_assignee_lists.select(:user_id) }))
+        end
 
-          issues.where.not(id: issues.joins(:assignees).where(users: { id: board_assignee_ids }))
+        override :metadata_fields
+        def metadata_fields
+          super.merge(total_weight: 'COALESCE(SUM(weight), 0)')
+        end
+
+        def without_milestones_from_lists(issues)
+          return issues if all_milestone_lists.empty?
+
+          issues.where("milestone_id NOT IN (?) OR milestone_id IS NULL",
+                       all_milestone_lists.select(:milestone_id))
         end
 
         def with_assignee(issues)
           issues.assigned_to(list.user)
         end
 
+        def with_milestone(issues)
+          issues.where(milestone_id: list.milestone_id)
+        end
+
         # Prevent filtering by milestone stubs
         # like Milestone::Upcoming, Milestone::Started etc
         def has_valid_milestone?

ee/app/services/ee/boards/issues/move_service.rb

@@ -14,7 +14,7 @@ module EE
             args.delete(:remove_label_ids)
           end
 
-          args.merge(assignee_ids: assignee_ids(issue))
+          args.merge(list_movement_args(issue))
         end
 
         def both_are_list_type?(type)
@@ -27,6 +27,25 @@ module EE
           moving_from_list.list_type == moving_to_list.list_type
         end
 
+        def list_movement_args(issue)
+          assignee_ids = assignee_ids(issue)
+          milestone_id = milestone_id(issue)
+
+          {
+            assignee_ids: assignee_ids,
+            milestone_id: milestone_id
+          }
+        end
+
+        def milestone_id(issue)
+          # We want to nullify the issue milestone.
+          return if moving_to_list.backlog?
+
+          # Moving to a list which is not a 'milestone list' will keep
+          # the already existent milestone.
+          [issue.milestone_id, moving_to_list.milestone_id].compact.last
+        end
+
         def assignee_ids(issue)
           assignees = (issue.assignee_ids + [moving_to_list.user_id]).compact
 

ee/app/services/ee/boards/lists/create_service.rb

@@ -6,10 +6,16 @@ module EE
 
         override :type
         def type
-          return :assignee if params.keys.include?('assignee_id')
-
+          # We don't ever expect to have more than one list
+          # type param at once.
+          if params.key?('assignee_id')
+            :assignee
+          elsif params.key?('milestone_id')
+            :milestone
+          else
             super
           end
+        end
 
         override :target
         def target(board)
@@ -17,17 +23,28 @@ module EE
             case type
             when :assignee
               find_user(board)
+            when :milestone
+              find_milestone(board)
             else
               super
             end
           end
         end
 
+        def find_milestone(board)
+          milestones = milestone_finder(board).execute
+          milestones.find(params['milestone_id'])
+        end
+
         def find_user(board)
           user_ids = user_finder(board).execute.select(:user_id)
           ::User.where(id: user_ids).find(params['assignee_id'])
         end
 
+        def milestone_finder(board)
+          @milestone_finder ||= ::Boards::MilestonesFinder.new(board, current_user)
+        end
+
         def user_finder(board)
           @user_finder ||= ::Boards::UsersFinder.new(board, current_user)
         end

ee/app/services/ee/boards/lists/list_service.rb

@@ -2,13 +2,35 @@ module EE
   module Boards
     module Lists
       module ListService
+        # When adding a new licensed type, make sure to also add
+        # it on license.rb with the pattern "board_<list_type>_lists"
+        LICENSED_LIST_TYPES = [:assignee, :milestone].freeze
+
         extend ::Gitlab::Utils::Override
 
         override :execute
         def execute(board)
-          return super if board.parent.feature_available?(:board_assignee_lists)
+          not_available_lists =
+            list_type_features_availability(board).select { |_, available| !available }
+
+          if not_available_lists.any?
+            super.where.not(list_type: not_available_lists.keys)
+          else
+            super
+          end
+        end
 
-          super.where.not(list_type: ::List.list_types[:assignee])
+        private
+
+        def list_type_features_availability(board)
+          parent = board.parent
+
+          {}.tap do |hash|
+            LICENSED_LIST_TYPES.each do |list_type|
+              list_type_key = ::List.list_types[list_type]
+              hash[list_type_key] = parent&.feature_available?(:"board_#{list_type}_lists")
+            end
+          end
         end
       end
     end

ee/app/views/shared/boards/components/_list_milestone.html.haml

+= content_tag(:span, sprite_icon('timer', size: 16), { "v-if": "list.milestone", "aria-hidden": "true", "class": "append-right-5" })

ee/app/views/shared/issuable/_board_create_list_dropdown.html.haml

-- if board.parent.feature_available?(:board_assignee_lists)
+- assignee_lists_available = board.parent.feature_available?(:board_assignee_lists)
+- milestone_lists_available = board.parent.feature_available?(:board_milestone_lists)
+
+- if assignee_lists_available || milestone_lists_available
   .dropdown.prepend-left-10#js-add-list
     %button.btn.btn-create.btn-inverted.d-flex.js-new-board-list{ type: "button", data: board_list_data }
       %span Add list
@@ -7,17 +10,30 @@
       %ul.nav.nav-tabs.dropdown-tabs-list.js-new-board-list-tabs{ role: 'tablist' }
         %li.nav-item.dropdown-tab-item.js-tab-button-labels
           %a.active{ href: '#', role: 'tab', data: { is_link: 'true', toggle: 'tab', action: 'tab-labels', target: '#tab-labels' } }
-            Label list
+            Label
+
+        - if assignee_lists_available
           %li.nav-item.dropdown-tab-item.js-tab-button-assignees
             %a{ href: '#', role: 'tab', data: { is_link: 'true', toggle: 'tab', action: 'tab-assignees', target: '#tab-assignees' } }
-            Assignee list
+              Assignee
+
+        - if milestone_lists_available
+          %li.nav-item.dropdown-tab-item.js-tab-button-milestones
+            %a{ href: '#', role: 'tab', data: { is_link: 'true', toggle: 'tab', action: 'tab-milestones', target: '#tab-milestones' } }
+              Milestone
       .tab-content
         #tab-labels.tab-pane.tab-pane-labels.active.js-tab-container-labels{ role: 'tabpanel' }
           = render partial: "shared/issuable/label_page_default", locals: { show_title: false, show_footer: true, show_create: true, show_boards_content: true, content_title: _('Label lists show all issues with the selected label.') }
           - if can?(current_user, :admin_label, board.parent)
             = render partial: "shared/issuable/label_page_create", locals: { show_close: false }
+
+        - if assignee_lists_available
           #tab-assignees.tab-pane.tab-pane-assignees.js-tab-container-assignees{ role: 'tabpanel' }
             = render partial: "shared/issuable/assignee_page_default"
+
+        - if milestone_lists_available
+          #tab-milestones.tab-pane.tab-pane-milestones.js-tab-container-milestones{ role: 'tabpanel' }
+            = render partial: "shared/issuable/milestone_page_default"
       = dropdown_loading
 - else
   = render_ce 'shared/issuable/board_create_list_dropdown', board: board

ee/app/views/shared/issuable/_milestone_page_default.html.haml

+.dropdown-page-one
+  .issue-board-dropdown-content
+    %p
+      = _('Milestone lists show all issues from the selected milestone.')
+  .js-milestone-list

ee/changelogs/unreleased/6469-issue-board-milestone-lists.yml

+---
+title: Add support for milestones lists on the issue boards
+merge_request: 6615
+author:
+type: added

ee/changelogs/unreleased/ccr-6397-add_board_assignee_list.yml

+---
+title: Allow creating assignee lists via API
+merge_request:
+author:
+type: added

ee/db/migrate/20180724161450_add_milestone_to_lists.rb

+class AddMilestoneToLists < ActiveRecord::Migration
+  DOWNTIME = false
+
+  def change
+    add_reference :lists, :milestone, index: true, foreign_key: { on_delete: :cascade }
+  end
+end

ee/lib/ee/api/boards_responses.rb

@@ -34,6 +34,41 @@ module EE
             end
           end
 
+          def create_list_params
+            params.slice(:label_id, :milestone_id, :assignee_id)
+          end
+
+          # Overrides API::BoardsResponses authorize_list_type_resource!
+          def authorize_list_type_resource!
+            if params[:label_id] && !available_labels_for(board_parent).exists?(params[:label_id])
+              render_api_error!({ error: 'Label not found!' }, 400)
+            end
+
+            if milestone_id = params[:milestone_id]
+              milestones = ::Boards::MilestonesFinder.new(board, current_user).execute
+
+              unless milestones.find_by(id: milestone_id)
+                render_api_error!({ error: 'Milestone not found!' }, 400)
+              end
+            end
+
+            if assignee_id = params[:assignee_id]
+              users = ::Boards::UsersFinder.new(board, current_user).execute
+
+              unless users.find_by(user_id: assignee_id)
+                render_api_error!({ error: 'User not found!' }, 400)
+              end
+            end
+          end
+
+          # Overrides API::BoardsResponses list_creation_params
+          params :list_creation_params do
+            optional :label_id, type: Integer, desc: 'The ID of an existing label'
+            optional :milestone_id, type: Integer, desc: 'The ID of an existing milestone'
+            optional :assignee_id, type: Integer, desc: 'The ID of an assignee'
+            exactly_one_of :label_id, :milestone_id, :assignee_id
+          end
+
           params :update_params do
             optional :name, type: String, desc: 'The board name'
             optional :assignee_id, type: Integer, desc: 'The ID of a user to associate with board'

ee/lib/ee/api/entities.rb

@@ -100,6 +100,15 @@ module EE
         end
       end
 
+      module List
+        extend ActiveSupport::Concern
+
+        prepended do
+          expose :milestone, using: ::API::Entities::Milestone, if: -> (entity, _) { entity.milestone? }
+          expose :user, as: :assignee, using: ::API::Entities::UserSafe, if: -> (entity, _) { entity.assignee? }
+        end
+      end
+
       module ApplicationSetting
         extend ActiveSupport::Concern
 

ee/spec/controllers/boards/milestones_controller_spec.rb

+require 'spec_helper'
+
+describe Boards::MilestonesController do
+  let(:project) { create(:project) }
+  let(:board) { create(:board, project: project) }
+  let(:user)  { create(:user) }
+
+  before do
+    create(:milestone, project: project)
+
+    project.add_maintainer(user)
+    sign_in(user)
+  end
+
+  describe 'GET index' do
+    it 'returns a list of all milestones of board parent' do
+      get :index, board_id: board.to_param, format: :json
+
+      parsed_response = JSON.parse(response.body)
+
+      expect(response).to have_gitlab_http_status(200)
+      expect(response.content_type).to eq('application/json')
+      expect(parsed_response).to all(match_schema('entities/milestone', dir: 'ee'))
+      expect(parsed_response.size).to eq(1)
+    end
+  end
+end

ee/spec/factories/lists.rb

@@ -4,4 +4,11 @@ FactoryBot.define do
     label nil
     user
   end
+
+  factory :milestone_list, parent: :list do
+    list_type :milestone
+    label nil
+    user nil
+    milestone
+  end
 end

ee/spec/finders/boards/milestones_finder_spec.rb

+require 'spec_helper'
+
+describe Boards::MilestonesFinder do
+  describe '#execute' do
+    let(:group) { create(:group) }
+    let(:nested_group) { create(:group, parent: group) }
+    let(:deep_nested_group) { create(:group, parent: group) }
+
+    let(:group_project) { create(:project, group: group) }
+    let(:nested_group_project) { create(:project, group: nested_group) }
+
+    let!(:group_milestone) { create(:milestone, group: group, project: nil) }
+    let!(:group_project_milestone) { create(:milestone, project: group_project, group: nil) }
+    let!(:nested_group_project_milestone) { create(:milestone, project: nested_group_project, group: nil) }
+    let!(:nested_group_milestone) { create(:milestone, group: nested_group, project: nil) }
+    let!(:deep_nested_group_milestone) { create(:milestone, group: deep_nested_group, project: nil) }
+
+    let(:user) { create(:user) }
+    let(:finder) { described_class.new(board, user) }
+
+    context 'when project board', :nested_groups do
+      let(:board) { create(:board, project: nested_group_project, group: nil) }
+
+      it 'returns milestones from board project and ancestors groups' do
+        group.add_developer(user)
+
+        results = finder.execute
+
+        expect(results).to contain_exactly(nested_group_project_milestone,
+                                           nested_group_milestone,
+                                           group_milestone)
+      end
+    end
+
+    context 'when group board', :nested_groups do
+      let(:board) { create(:board, project: nil, group: nested_group) }
+
+      it 'returns milestones from board group and its ancestors' do
+        group.add_developer(user)
+
+        results = finder.execute
+
+        expect(results).to contain_exactly(group_milestone,
+                                           nested_group_milestone)
+      end
+    end
+  end
+end

ee/spec/fixtures/api/schemas/entities/milestone.json

+{
+  "type": "object",
+  "properties" : {
+    "id": { "type": "integer" },
+    "iid": { "type": "integer" },
+    "project_id": { "type": ["integer", "null"] },
+    "group_id": { "type": ["integer", "null"] },
+    "title": { "type": "string" },
+    "description": { "type": ["string", "null"] },
+    "state": { "type": "string" },
+    "created_at": { "type": "string" },
+    "updated_at": { "type": "string" },
+    "start_date": { "type": ["date", "null"] },
+    "due_date": { "type": ["date", "null"] },
+    "web_url": { "type": "string" }
+  },
+  "additionalProperties": false
+}

ee/spec/javascripts/boards/components/assignees_list/assignees_list_item_spec.js → ee/spec/javascripts/boards/components/board_list_selector/assignees_list_item_spec.js

 import Vue from 'vue';
 
-import AssigneesListItemComponent from 'ee/boards/components/assignees_list/assignees_list_item.vue';
+import AssigneesListItemComponent from 'ee/boards/components/boards_list_selector/assignees_list_item.vue';
 import mountComponent from 'spec/helpers/vue_mount_component_helper';
 
 import { mockAssigneesList } from 'spec/boards/mock_data';
@@ -9,7 +9,7 @@ const createComponent = () => {
   const Component = Vue.extend(AssigneesListItemComponent);
 
   return mountComponent(Component, {
-    assignee: mockAssigneesList[0],
+    item: mockAssigneesList[0],
   });
 };
 

ee/spec/javascripts/boards/components/assignees_list/assignees_list_spec.js → ee/spec/javascripts/boards/components/board_list_selector/board_list_selector_spec.js

@@ -2,19 +2,20 @@ import '~/boards/stores/boards_store';
 
 import MockAdapter from 'axios-mock-adapter';
 import axios from '~/lib/utils/axios_utils';
-import AssigneesListComponent from 'ee/boards/components/assignees_list/';
+import BoardListSelectorComponent from 'ee/boards/components/boards_list_selector/';
 
 import mountComponent from 'spec/helpers/vue_mount_component_helper';
 
 import { mockAssigneesList } from 'spec/boards/mock_data';
 import { TEST_HOST } from 'spec/test_constants';
 
-describe('AssigneesListComponent', () => {
+describe('BoardListSelectorComponent', () => {
   const dummyEndpoint = `${TEST_HOST}/users.json`;
 
   const createComponent = () =>
-    mountComponent(AssigneesListComponent, {
-      listAssigneesPath: dummyEndpoint,
+    mountComponent(BoardListSelectorComponent, {
+      listPath: dummyEndpoint,
+      listType: 'assignees',
     });
 
   let vm;
@@ -43,13 +44,13 @@ describe('AssigneesListComponent', () => {
   });
 
   describe('methods', () => {
-    describe('loadAssignees', () => {
+    describe('loadList', () => {
       it('calls axios.get and sets response to store.state.assignees', done => {
         mock.onGet(dummyEndpoint).reply(200, mockAssigneesList);
         gl.issueBoards.BoardsStore.state.assignees = [];
 
         vm
-          .loadAssignees()
+          .loadList()
           .then(() => {
             expect(vm.loading).toBe(false);
             expect(vm.store.state.assignees.length).toBe(mockAssigneesList.length);
@@ -63,7 +64,7 @@ describe('AssigneesListComponent', () => {
         gl.issueBoards.BoardsStore.state.assignees = mockAssigneesList;
 
         vm
-          .loadAssignees()
+          .loadList()
           .then(() => {
             expect(axios.get).not.toHaveBeenCalled();
           })
@@ -76,7 +77,7 @@ describe('AssigneesListComponent', () => {
         gl.issueBoards.BoardsStore.state.assignees = [];
 
         vm
-          .loadAssignees()
+          .loadList()
           .then(() => {
             expect(vm.loading).toBe(false);
             expect(document.querySelector('.flash-text').innerText.trim()).toBe(

ee/spec/javascripts/boards/components/assignees_list/assignees_list_container_spec.js → ee/spec/javascripts/boards/components/board_list_selector/list_container_spec.js

 import Vue from 'vue';
 
-import AssigneesListContainerComponent from 'ee/boards/components/assignees_list/assignees_list_container.vue';
+import ListContainerComponent from 'ee/boards/components/boards_list_selector/list_container.vue';
 import mountComponent from 'spec/helpers/vue_mount_component_helper';
 
 import { mockAssigneesList } from 'spec/boards/mock_data';
 
 const createComponent = () => {
-  const Component = Vue.extend(AssigneesListContainerComponent);
+  const Component = Vue.extend(ListContainerComponent);
 
   return mountComponent(Component, {
     loading: false,
-    assignees: mockAssigneesList,
+    items: mockAssigneesList,
+    listType: 'assignees',
   });
 };
 
-describe('AssigneesListContainerComponent', () => {
+describe('ListContainerComponent', () => {
   let vm;
 
   beforeEach(() => {
@@ -26,26 +27,26 @@ describe('AssigneesListContainerComponent', () => {
   });
 
   describe('computed', () => {
-    describe('filteredAssignees', () => {
+    describe('filteredItems', () => {
       it('returns assignees list as it is when `query` is empty', () => {
         vm.query = '';
-        expect(vm.filteredAssignees.length).toBe(mockAssigneesList.length);
+        expect(vm.filteredItems.length).toBe(mockAssigneesList.length);
       });
 
       it('returns filtered assignees list as it is when `query` has name', () => {
         const assignee = mockAssigneesList[0];
 
         vm.query = assignee.name;
-        expect(vm.filteredAssignees.length).toBe(1);
-        expect(vm.filteredAssignees[0].name).toBe(assignee.name);
+        expect(vm.filteredItems.length).toBe(1);
+        expect(vm.filteredItems[0].name).toBe(assignee.name);
       });
 
       it('returns filtered assignees list as it is when `query` has username', () => {
         const assignee = mockAssigneesList[0];
 
         vm.query = assignee.username;
-        expect(vm.filteredAssignees.length).toBe(1);
-        expect(vm.filteredAssignees[0].username).toBe(assignee.username);
+        expect(vm.filteredItems.length).toBe(1);
+        expect(vm.filteredItems[0].username).toBe(assignee.username);
       });
     });
   });

ee/spec/javascripts/boards/components/assignees_list/assignees_list_content_spec.js → ee/spec/javascripts/boards/components/board_list_selector/list_content_spec.js

 import Vue from 'vue';
 
-import AssigneesListContentComponent from 'ee/boards/components/assignees_list/assignees_list_content.vue';
+import ListContentComponent from 'ee/boards/components/boards_list_selector/list_content.vue';
 import mountComponent from 'spec/helpers/vue_mount_component_helper';
 
 import { mockAssigneesList } from 'spec/boards/mock_data';
 
 const createComponent = () => {
-  const Component = Vue.extend(AssigneesListContentComponent);
+  const Component = Vue.extend(ListContentComponent);
 
   return mountComponent(Component, {
-    assignees: mockAssigneesList,
+    items: mockAssigneesList,
+    listType: 'assignees',
   });
 };
 
-describe('AssigneesListContentComponent', () => {
+describe('ListContentComponent', () => {
   let vm;
 
   beforeEach(() => {

ee/spec/javascripts/boards/components/assignees_list/assignees_list_filter_spec.js → ee/spec/javascripts/boards/components/board_list_selector/list_filter_spec.js

 import Vue from 'vue';
 
-import AssigneesListFilterComponent from 'ee/boards/components/assignees_list/assignees_list_filter.vue';
+import ListFilterComponent from 'ee/boards/components/boards_list_selector/list_filter.vue';
 import mountComponent from 'spec/helpers/vue_mount_component_helper';
 
 const createComponent = () => {
-  const Component = Vue.extend(AssigneesListFilterComponent);
+  const Component = Vue.extend(ListFilterComponent);
 
   return mountComponent(Component);
 };
 
-describe('AssigneesListFilterComponent', () => {
+describe('ListFilterComponent', () => {
   let vm;
 
   beforeEach(() => {

ee/spec/models/ee/list_spec.rb

 require 'rails_helper'
 
 describe List do
-  context 'when it is an assignee type' do
   let(:board) { create(:board) }
 
+  describe 'relationships' do
+    it { is_expected.to belong_to(:user) }
+    it { is_expected.to belong_to(:milestone) }
+  end
+
+  context 'when it is an assignee type' do
     subject { described_class.new(list_type: :assignee, board: board) }
 
     it { is_expected.to be_destroyable }
     it { is_expected.to be_movable }
 
-    describe 'relationships' do
-      it { is_expected.to belong_to(:user) }
-    end
-
     describe 'validations' do
       it { is_expected.to validate_presence_of(:user) }
     end
@@ -25,4 +26,30 @@ describe List do
       end
     end
   end
+
+  context 'when it is a milestone type' do
+    let(:milestone) { build(:milestone, title: 'awesome-release') }
+    subject { described_class.new(list_type: :milestone, milestone: milestone, board: board) }
+
+    it { is_expected.to be_destroyable }
+    it { is_expected.to be_movable }
+
+    describe 'validations' do
+      it { is_expected.to validate_presence_of(:milestone) }
+
+      it 'is invalid when feature is not available' do
+        stub_licensed_features(board_milestone_lists: false)
+
+        expect(subject).to be_invalid
+        expect(subject.errors[:list_type])
+          .to contain_exactly('Milestone lists not available with your current license')
+      end
+    end
+
+    describe '#title' do
+      it 'returns the milestone title' do
+        expect(subject.title).to eq('awesome-release')
+      end
+    end
+  end
 end

ee/spec/requests/api/boards_spec.rb

@@ -7,4 +7,11 @@ describe API::Boards do
   set(:board) { create(:board, project: board_parent, milestone: milestone) }
 
   it_behaves_like 'multiple and scoped issue boards', "/projects/:id/boards"
+
+  describe 'POST /projects/:id/boards/:board_id/lists' do
+    let(:url) { "/projects/#{board_parent.id}/boards/#{board.id}/lists" }
+
+    it_behaves_like 'milestone board list'
+    it_behaves_like 'assignee board list'
+  end
 end

ee/spec/requests/api/group_boards_spec.rb

@@ -46,4 +46,11 @@ describe API::GroupBoards do
 
   it_behaves_like 'group and project boards', "/groups/:id/boards", true
   it_behaves_like 'multiple and scoped issue boards', "/groups/:id/boards"
+
+  describe 'POST /groups/:id/boards/:board_id/lists' do
+    let(:url) { "/groups/#{board_parent.id}/boards/#{board.id}/lists" }
+
+    it_behaves_like 'milestone board list'
+    it_behaves_like 'assignee board list'
+  end
 end

ee/spec/services/ee/boards/issues/create_service_spec.rb

@@ -6,19 +6,46 @@ describe Boards::Issues::CreateService do
     let(:board)   { create(:board, project: project) }
     let(:user)    { create(:user) }
     let(:label)   { create(:label, project: project, name: 'in-progress') }
-    let(:list)    { create(:list, board: board, user: user, list_type: List.list_types[:assignee], position: 0) }
 
-    subject(:service) { described_class.new(board.parent, project, user, board_id: board.id, list_id: list.id, title: 'New issue') }
+    subject(:service) do
+      described_class.new(board.parent, project, user, board_id: board.id, list_id: list.id, title: 'New issue')
+    end
 
     before do
-      stub_licensed_features(board_assignee_lists: true)
       project.add_developer(user)
     end
 
+    context 'assignees list' do
+      before do
+        stub_licensed_features(board_assignee_lists: true)
+      end
+
+      let(:list) do
+        create(:list, board: board, user: user, list_type: List.list_types[:assignee], position: 0)
+      end
+
       it 'assigns the issue to the List assignee' do
         issue = service.execute
 
         expect(issue.assignees).to eq([user])
       end
     end
+
+    context 'milestone list' do
+      before do
+        stub_licensed_features(board_milestone_lists: true)
+      end
+
+      let(:milestone) { create(:milestone, project: project) }
+      let(:list) do
+        create(:list, board: board, milestone: milestone, list_type: List.list_types[:milestone], position: 0)
+      end
+
+      it 'assigns the issue to the list milestone' do
+        issue = service.execute
+
+        expect(issue.milestone).to eq(milestone)
+      end
+    end
+  end
 end

ee/spec/services/ee/boards/issues/list_service_spec.rb

@@ -20,6 +20,7 @@ describe Boards::Issues::ListService, services: true do
     let(:p3) { create(:group_label, title: 'P3', group: group) }
 
     let(:user_list) { create(:user_list, board: board, position: 2) }
+    let(:milestone_list) { create(:milestone_list, board: board, position: 3) }
     let(:backlog)   { create(:backlog_list, board: board) }
     let(:list1)     { create(:list, board: board, label: development, position: 0) }
     let(:list2)     { create(:list, board: board, label: testing, position: 1) }
@@ -44,11 +45,36 @@ describe Boards::Issues::ListService, services: true do
     let(:parent) { group }
 
     before do
-      stub_licensed_features(board_assignee_lists: true)
+      stub_licensed_features(board_assignee_lists: true, board_milestone_lists: true)
+
       parent.add_developer(user)
       opened_issue3.assignees.push(user_list.user)
     end
 
+    context 'milestone lists' do
+      let!(:milestone_issue) { create(:labeled_issue, project: project, milestone: milestone_list.milestone, labels: [p3]) }
+
+      it 'returns issues from milestone persisted in the list' do
+        params = { board_id: board.id, id: milestone_list.id }
+
+        issues = described_class.new(parent, user, params).execute
+
+        expect(issues).to contain_exactly(milestone_issue)
+      end
+
+      context 'backlog list context' do
+        it 'returns issues without milestones and without milestones from other lists' do
+          params = { board_id: board.id, id: backlog.id }
+
+          issues = described_class.new(parent, user, params).execute
+
+          expect(issues).to contain_exactly(opened_issue1, # milestone from this issue is not in a list
+                                            opened_issue2, # milestone from this issue is not in a list
+                                            reopened_issue1) # has no milestone
+        end
+      end
+    end
+
     context '#metadata' do
       it 'returns issues count and weight for list' do
         params = { board_id: board.id, id: backlog.id }
@@ -72,7 +98,7 @@ describe Boards::Issues::ListService, services: true do
     end
 
     context 'when list_id is missing' do
-      context 'when board does not have a milestone' do
+      context 'when board is not scoped by milestone' do
         it 'returns opened issues without board labels and assignees applied' do
           params = { board_id: board.id }
 
@@ -82,14 +108,15 @@ describe Boards::Issues::ListService, services: true do
         end
       end
 
-      context 'when board have a milestone' do
+      context 'when board is scoped by milestone' do
         it 'returns opened issues without board labels, assignees, or milestone applied' do
           params = { board_id: board.id }
           board.update_attribute(:milestone, m1)
 
           issues = described_class.new(parent, user, params).execute
 
-          expect(issues).to match_array([opened_issue2, list1_issue2, reopened_issue1, opened_issue1])
+          expect(issues)
+            .to match_array([opened_issue2, list1_issue2, reopened_issue1, opened_issue1])
         end
 
         context 'when milestone is predefined' do

ee/spec/services/ee/boards/issues/move_service_spec.rb

 require 'spec_helper'
 
 describe Boards::Issues::MoveService, services: true do
+  shared_examples 'moving an issue to/from milestone lists' do
+    context 'from backlog to milestone list' do
+      let!(:issue) { create(:labeled_issue, project: project) }
+
+      it 'assigns the milestone' do
+        params = { board_id: board1.id, from_list_id: backlog.id, to_list_id: milestone_list1.id }
+
+        expect { described_class.new(parent, user, params).execute(issue) }
+          .to change { issue.reload.milestone }
+          .from(nil)
+          .to(milestone_list1.milestone)
+      end
+    end
+
+    context 'from milestone to backlog list' do
+      let!(:issue) { create(:labeled_issue, project: project, milestone: milestone_list1.milestone) }
+
+      it 'removes the milestone' do
+        params = { board_id: board1.id, from_list_id: milestone_list1.id, to_list_id: backlog.id }
+        expect { described_class.new(parent, user, params).execute(issue) } .to change { issue.reload.milestone }
+          .from(milestone_list1.milestone)
+          .to(nil)
+      end
+    end
+
+    context 'from label to milestone list' do
+      let(:issue)  { create(:labeled_issue, project: project, labels: [bug, development]) }
+
+      it 'assigns the milestone and keeps labels' do
+        params = { board_id: board1.id, from_list_id: label_list1.id, to_list_id: milestone_list1.id }
+
+        expect { described_class.new(parent, user, params).execute(issue) }
+          .to change { issue.reload.milestone }
+          .from(nil)
+          .to(milestone_list1.milestone)
+
+        expect(issue.labels).to contain_exactly(bug, development)
+      end
+    end
+
+    context 'from milestone to label list' do
+      let!(:issue) do
+        create(:labeled_issue, project: project,
+                               milestone: milestone_list1.milestone,
+                               labels: [bug, development])
+      end
+
+      it 'adds labels and keeps milestone' do
+        params = { board_id: board1.id, from_list_id: milestone_list1.id, to_list_id: label_list2.id }
+
+        described_class.new(parent, user, params).execute(issue)
+        issue.reload
+
+        expect(issue.labels).to contain_exactly(bug, development, testing)
+      end
+    end
+
+    context 'from assignee to milestone list' do
+      let!(:issue) { create(:labeled_issue, project: project, assignees: [user], milestone: nil) }
+
+      it 'assigns the milestone and keeps assignees' do
+        params = { board_id: board1.id, from_list_id: user_list1.id, to_list_id: milestone_list1.id }
+
+        expect { described_class.new(parent, user, params).execute(issue) }
+          .to change { issue.reload.milestone }
+          .from(nil)
+          .to(milestone_list1.milestone)
+
+        expect(issue.assignees).to eq([user])
+      end
+    end
+
+    context 'from milestone to assignee list' do
+      let!(:issue) { create(:labeled_issue, project: project, milestone: milestone_list1.milestone) }
+
+      it 'assigns the user and keeps milestone' do
+        params = { board_id: board1.id, from_list_id: milestone_list1.id, to_list_id: user_list1.id }
+
+        described_class.new(parent, user, params).execute(issue)
+        issue.reload
+
+        expect(issue.milestone).to eq(milestone_list1.milestone)
+        expect(issue.assignees).to contain_exactly(user_list1.user)
+      end
+    end
+
+    context 'between milestone lists' do
+      let!(:issue) { create(:labeled_issue, project: project, milestone: milestone_list1.milestone) }
+
+      it 'replaces previous list milestone to targeting list milestone' do
+        params = { board_id: board1.id, from_list_id: milestone_list1.id, to_list_id: milestone_list2.id }
+
+        expect { described_class.new(parent, user, params).execute(issue) }
+          .to change { issue.reload.milestone }
+          .from(milestone_list1.milestone)
+          .to(milestone_list2.milestone)
+      end
+    end
+  end
+
   shared_examples 'moving an issue to/from assignee lists' do
     let(:issue)  { create(:labeled_issue, project: project, labels: [bug, development]) }
-    let(:params) { { board_id: board1.id, from_list_id: list1.id, to_list_id: list2.id } }
+    let(:params) { { board_id: board1.id, from_list_id: label_list1.id, to_list_id: label_list2.id } }
 
     context 'from assignee to label list' do
       it 'does not unassign and adds label' do
-        params = { board_id: board1.id, from_list_id: list3.id, to_list_id: list2.id }
-        issue.assignees.push(list3.user)
-        expect(issue.assignees).to contain_exactly(list3.user)
+        params = { board_id: board1.id, from_list_id: user_list1.id, to_list_id: label_list2.id }
+        issue.assignees.push(user_list1.user)
+        expect(issue.assignees).to contain_exactly(user_list1.user)
 
         described_class.new(parent, user, params).execute(issue)
 
         issue.reload
         expect(issue.labels).to contain_exactly(bug, development, testing)
-        expect(issue.assignees).to contain_exactly(list3.user)
+        expect(issue.assignees).to contain_exactly(user_list1.user)
       end
     end
 
     context 'from assignee to backlog' do
       it 'removes assignment' do
-        params = { board_id: board1.id, from_list_id: list3.id, to_list_id: backlog.id }
-        issue.assignees.push(list3.user)
-        expect(issue.assignees).to contain_exactly(list3.user)
+        params = { board_id: board1.id, from_list_id: user_list1.id, to_list_id: backlog.id }
+        issue.assignees.push(user_list1.user)
+        expect(issue.assignees).to contain_exactly(user_list1.user)
 
         described_class.new(parent, user, params).execute(issue)
 
@@ -35,35 +135,35 @@ describe Boards::Issues::MoveService, services: true do
 
     context 'from assignee to closed list' do
       it 'keeps assignment and closes the issue' do
-        params = { board_id: board1.id, from_list_id: list3.id, to_list_id: closed.id }
-        issue.assignees.push(list3.user)
-        expect(issue.assignees).to contain_exactly(list3.user)
+        params = { board_id: board1.id, from_list_id: user_list1.id, to_list_id: closed.id }
+        issue.assignees.push(user_list1.user)
+        expect(issue.assignees).to contain_exactly(user_list1.user)
 
         described_class.new(parent, user, params).execute(issue)
 
         issue.reload
-        expect(issue.assignees).to contain_exactly(list3.user)
+        expect(issue.assignees).to contain_exactly(user_list1.user)
         expect(issue).to be_closed
       end
     end
 
     context 'from label list to assignee' do
       it 'assigns and does not remove label' do
-        params = { board_id: board1.id, from_list_id: list1.id, to_list_id: list3.id }
+        params = { board_id: board1.id, from_list_id: label_list1.id, to_list_id: user_list1.id }
 
         described_class.new(parent, user, params).execute(issue)
 
         issue.reload
         expect(issue.labels).to contain_exactly(bug, development)
-        expect(issue.assignees).to contain_exactly(list3.user)
+        expect(issue.assignees).to contain_exactly(user_list1.user)
       end
     end
 
     context 'between two assignee lists' do
       it 'unassigns removal and assigns addition' do
-        params = { board_id: board1.id, from_list_id: list3.id, to_list_id: list4.id }
-        issue.assignees.push(list3.user)
-        expect(issue.assignees).to contain_exactly(list3.user)
+        params = { board_id: board1.id, from_list_id: user_list1.id, to_list_id: user_list2.id }
+        issue.assignees.push(user_list1.user)
+        expect(issue.assignees).to contain_exactly(user_list1.user)
 
         described_class.new(parent, user, params).execute(issue)
 
@@ -80,10 +180,12 @@ describe Boards::Issues::MoveService, services: true do
     let!(:board1) { create(:board, **parent_attr) }
     let(:board2) { create(:board, **parent_attr) }
 
-    let(:list1)   { create(:list, board: board1, label: development, position: 0) }
-    let(:list2)   { create(:list, board: board1, label: testing, position: 1) }
-    let(:list3)   { create(:user_list, board: board1, position: 2) }
-    let(:list4)   { create(:user_list, board: board1, user: user, position: 3) }
+    let(:label_list1) { create(:list, board: board1, label: development, position: 0) }
+    let(:label_list2) { create(:list, board: board1, label: testing, position: 1) }
+    let(:user_list1) { create(:user_list, board: board1, position: 2) }
+    let(:user_list2) { create(:user_list, board: board1, user: user, position: 3) }
+    let(:milestone_list1) { create(:milestone_list, board: board1, milestone: milestone1, position: 4) }
+    let(:milestone_list2) { create(:milestone_list, board: board1, milestone: milestone2, position: 5) }
     let(:closed) { create(:closed_list, board: board1) }
     let(:backlog) { create(:backlog_list, board: board1) }
 
@@ -91,6 +193,8 @@ describe Boards::Issues::MoveService, services: true do
       let(:project) { create(:project) }
       let(:parent_attr) { { project: project } }
       let(:parent) { project }
+      let(:milestone1) { create(:milestone, project: project) }
+      let(:milestone2) { create(:milestone, project: project) }
 
       let(:bug) { create(:label, project: project, name: 'Bug') }
       let(:development) { create(:label, project: project, name: 'Development') }
@@ -98,12 +202,13 @@ describe Boards::Issues::MoveService, services: true do
       let(:regression) { create(:label, project: project, name: 'Regression') }
 
       before do
-        stub_licensed_features(board_assignee_lists: true)
+        stub_licensed_features(board_assignee_lists: true, board_milestone_lists: true)
         parent.add_developer(user)
-        parent.add_developer(list3.user)
+        parent.add_developer(user_list1.user)
       end
 
       it_behaves_like 'moving an issue to/from assignee lists'
+      it_behaves_like 'moving an issue to/from milestone lists'
     end
 
     context 'when parent is a group' do
@@ -111,6 +216,8 @@ describe Boards::Issues::MoveService, services: true do
       let(:project) { create(:project, namespace: group) }
       let(:parent_attr) { { group: group } }
       let(:parent) { group }
+      let(:milestone1) { create(:milestone, group: group) }
+      let(:milestone2) { create(:milestone, group: group) }
 
       let(:bug) { create(:group_label, group: group, name: 'Bug') }
       let(:development) { create(:group_label, group: group, name: 'Development') }
@@ -118,12 +225,13 @@ describe Boards::Issues::MoveService, services: true do
       let(:regression) { create(:group_label, group: group, name: 'Regression') }
 
       before do
-        stub_licensed_features(board_assignee_lists: true)
+        stub_licensed_features(board_assignee_lists: true, board_milestone_lists: true)
         parent.add_developer(user)
-        parent.add_developer(list3.user)
+        parent.add_developer(user_list1.user)
       end
 
       it_behaves_like 'moving an issue to/from assignee lists'
+      it_behaves_like 'moving an issue to/from milestone lists'
     end
   end
 end

ee/spec/services/ee/boards/lists/create_service_spec.rb

@@ -2,18 +2,17 @@ require 'spec_helper'
 
 describe Boards::Lists::CreateService do
   describe '#execute' do
-    let(:parent) { create(:project) }
-    let(:board) { create(:board, project: parent) }
-    let(:label) { create(:label, project: parent, name: 'in-progress') }
+    let(:project) { create(:project) }
+    let(:board) { create(:board, project: project) }
 
+    context 'when assignee_id param is sent' do
       let(:user) { create(:user) }
       let(:other_user) { create(:user) }
-
-    subject(:service) { described_class.new(parent, user, 'assignee_id' => other_user.id) }
+      subject(:service) { described_class.new(project, user, 'assignee_id' => other_user.id) }
 
       before do
-      parent.add_developer(user)
-      parent.add_developer(other_user)
+        project.add_developer(user)
+        project.add_developer(other_user)
 
         stub_licensed_features(board_assignee_lists: true)
       end
@@ -25,4 +24,24 @@ describe Boards::Lists::CreateService do
         expect(list).to be_valid
       end
     end
+
+    context 'when milestone_id param is sent' do
+      let(:user) { create(:user) }
+      let(:milestone) { create(:milestone, project: project) }
+      subject(:service) { described_class.new(project, user, 'milestone_id' => milestone.id) }
+
+      before do
+        project.add_developer(user)
+
+        stub_licensed_features(board_milestone_lists: true)
+      end
+
+      it 'creates a milestone list when param is valid' do
+        list = service.execute(board)
+
+        expect(list.list_type).to eq('milestone')
+        expect(list).to be_valid
+      end
+    end
+  end
 end

ee/spec/services/ee/boards/lists/list_service_spec.rb

@@ -10,6 +10,7 @@ describe Boards::Lists::ListService do
       context 'when the feature is enabled' do
         before do
           allow(board.parent).to receive(:feature_available?).with(:board_assignee_lists).and_return(true)
+          allow(board.parent).to receive(:feature_available?).with(:board_milestone_lists).and_return(false)
         end
 
         it 'returns all lists' do
@@ -24,6 +25,30 @@ describe Boards::Lists::ListService do
       end
     end
 
+    shared_examples 'list service for board with milestone lists' do
+      let!(:milestone_list) { build(:milestone_list, board: board).tap { |l| l.save(validate: false) } }
+      let!(:backlog_list) { create(:backlog_list, board: board) }
+      let!(:list) { create(:list, board: board, label: label) }
+
+      context 'when the feature is enabled' do
+        before do
+          allow(board.parent).to receive(:feature_available?).with(:board_assignee_lists).and_return(false)
+          allow(board.parent).to receive(:feature_available?).with(:board_milestone_lists).and_return(true)
+        end
+
+        it 'returns all lists' do
+          expect(service.execute(board))
+            .to match_array([backlog_list, list, milestone_list, board.closed_list])
+        end
+      end
+
+      context 'when the feature is disabled' do
+        it 'filters out assignee lists that might have been created while subscribed' do
+          expect(service.execute(board)).to match_array [backlog_list, list, board.closed_list]
+        end
+      end
+    end
+
     context 'when board parent is a project' do
       let(:project) { create(:project) }
       let(:board) { create(:board, project: project) }
@@ -31,6 +56,7 @@ describe Boards::Lists::ListService do
       let(:service) { described_class.new(project, double) }
 
       it_behaves_like 'list service for board with assignee lists'
+      it_behaves_like 'list service for board with milestone lists'
     end
 
     context 'when board parent is a group' do
@@ -40,6 +66,7 @@ describe Boards::Lists::ListService do
       let(:service) { described_class.new(group, double) }
 
       it_behaves_like 'list service for board with assignee lists'
+      it_behaves_like 'list service for board with milestone lists'
     end
   end
 end

ee/spec/support/shared_examples/assignee_board_list.rb

+# frozen_string_literal: true
+shared_examples_for 'assignee board list' do
+  context 'when assignee_id is sent' do
+    it 'returns 400 if user is not found' do
+      other_user = create(:user)
+      post api(url, user), assignee_id: other_user.id
+
+      expect(response).to have_gitlab_http_status(400)
+      expect(json_response.dig('message', 'error')).to eq('User not found!')
+    end
+
+    it 'returns 400 if assignee list feature is not available' do
+      stub_licensed_features(board_assignee_lists: false)
+
+      post api(url, user), assignee_id: user.id
+
+      expect(response).to have_gitlab_http_status(400)
+      expect(json_response.dig('message', 'list_type'))
+          .to contain_exactly('Assignee lists not available with your current license')
+    end
+
+    it 'creates an assignee list if user is found' do
+      stub_licensed_features(board_assignee_lists: true)
+
+      post api(url, user), assignee_id: user.id
+
+      expect(response).to have_gitlab_http_status(201)
+      expect(json_response.dig('assignee', 'id')).to eq(user.id)
+    end
+  end
+end

ee/spec/support/shared_examples/milestone_board_list.rb

+shared_examples_for 'milestone board list' do
+  context 'when milestone_id is sent' do
+    it 'returns 400 if milestone is not found' do
+      other_milestone = create(:milestone)
+      post api(url, user), milestone_id: other_milestone.id
+
+      expect(response).to have_gitlab_http_status(400)
+      expect(json_response.dig('message', 'error')).to eq('Milestone not found!')
+    end
+
+    it 'returns 400 if milestone list feature is not available' do
+      stub_licensed_features(board_milestone_lists: false)
+
+      post api(url, user), milestone_id: milestone.id
+
+      expect(response).to have_gitlab_http_status(400)
+      expect(json_response.dig('message', 'list_type'))
+        .to contain_exactly('Milestone lists not available with your current license')
+    end
+
+    it 'creates a milestone list if milestone is found' do
+      stub_licensed_features(board_milestone_lists: true)
+
+      post api(url, user), milestone_id: milestone.id
+
+      expect(response).to have_gitlab_http_status(201)
+      expect(json_response.dig('milestone', 'id')).to eq(milestone.id)
+    end
+  end
+end

lib/api/boards.rb

 module API
   class Boards < Grape::API
     include BoardsResponses
+    include EE::API::BoardsResponses
     include PaginationParams
 
     before { authenticate! }
@@ -71,12 +72,10 @@ module API
           success Entities::List
         end
         params do
-          requires :label_id, type: Integer, desc: 'The ID of an existing label'
+          use :list_creation_params
         end
         post '/lists' do
-          unless available_labels_for(user_project).exists?(params[:label_id])
-            render_api_error!({ error: 'Label not found!' }, 400)
-          end
+          authorize_list_type_resource!
 
           authorize!(:admin_list, user_project)
 

lib/api/boards_responses.rb

@@ -14,7 +14,7 @@ module API
 
         def create_list
           create_list_service =
-            ::Boards::Lists::CreateService.new(board_parent, current_user, { label_id: params[:label_id] })
+            ::Boards::Lists::CreateService.new(board_parent, current_user, create_list_params)
 
           list = create_list_service.execute(board)
 
@@ -25,6 +25,10 @@ module API
           end
         end
 
+        def create_list_params
+          params.slice(:label_id)
+        end
+
         def move_list(list)
           move_list_service =
             ::Boards::Lists::MoveService.new(board_parent, current_user, { position: params[:position].to_i })
@@ -44,6 +48,16 @@ module API
             end
           end
         end
+
+        def authorize_list_type_resource!
+          unless available_labels_for(board_parent).exists?(params[:label_id])
+            render_api_error!({ error: 'Label not found!' }, 400)
+          end
+        end
+
+        params :list_creation_params do
+          requires :label_id, type: Integer, desc: 'The ID of an existing label'
+        end
       end
     end
   end

lib/api/entities.rb

@@ -1453,6 +1453,7 @@ API::Entities.prepend_entity(::API::Entities::Board, with: EE::API::Entities::Bo
 API::Entities.prepend_entity(::API::Entities::Group, with: EE::API::Entities::Group)
 API::Entities.prepend_entity(::API::Entities::GroupDetail, with: EE::API::Entities::GroupDetail)
 API::Entities.prepend_entity(::API::Entities::IssueBasic, with: EE::API::Entities::IssueBasic)
+API::Entities.prepend_entity(::API::Entities::List, with: EE::API::Entities::List)
 API::Entities.prepend_entity(::API::Entities::MergeRequestBasic, with: EE::API::Entities::MergeRequestBasic)
 API::Entities.prepend_entity(::API::Entities::Namespace, with: EE::API::Entities::Namespace)
 API::Entities.prepend_entity(::API::Entities::Project, with: EE::API::Entities::Project)

lib/api/group_boards.rb

@@ -71,12 +71,10 @@ module API
           success Entities::List
         end
         params do
-          requires :label_id, type: Integer, desc: 'The ID of an existing label'
+          use :list_creation_params
         end
         post '/lists' do
-          unless available_labels_for(board_parent).exists?(params[:label_id])
-            render_api_error!({ error: 'Label not found!' }, 400)
-          end
+          authorize_list_type_resource!
 
           authorize!(:admin_list, user_group)
 

locale/gitlab.pot

@@ -723,7 +723,7 @@ msgstr ""
 msgid "Assignee"
 msgstr ""
 
-msgid "Assignee boards not available with your current license"
+msgid "Assignee lists not available with your current license"
 msgstr ""
 
 msgid "Assignee lists show all issues assigned to the selected user."
@@ -4357,6 +4357,12 @@ msgstr ""
 msgid "Milestone"
 msgstr ""
 
+msgid "Milestone lists not available with your current license"
+msgstr ""
+
+msgid "Milestone lists show all issues from the selected milestone."
+msgstr ""
+
 msgid "Milestones"
 msgstr ""
 
@@ -6046,7 +6052,7 @@ msgstr ""
 msgid "Something went wrong while closing the %{issuable}. Please try again later"
 msgstr ""
 
-msgid "Something went wrong while fetching assignees list"
+msgid "Something went wrong while fetching %{listType} list"
 msgstr ""
 
 msgid "Something went wrong while fetching group member contributions"