Seach issues in graphQl by milestone and assignees

- none and any for assigne_id are supported

app/graphql/resolvers/issues_resolver.rb

@@ -15,6 +15,15 @@ module Resolvers
     argument :label_name, GraphQL::STRING_TYPE.to_list_type,
               required: false,
               description: 'Labels applied to this issue'
+    argument :milestone_title, GraphQL::STRING_TYPE.to_list_type,
+              required: false,
+              description: 'Milestones applied to this issue'
+    argument :assignee_username, GraphQL::STRING_TYPE,
+              required: false,
+              description: 'Username of a user assigned to the issues'
+    argument :assignee_id, GraphQL::STRING_TYPE,
+              required: false,
+              description: 'ID of a user assigned to the issues, "none" and "any" values supported'
     argument :created_before, Types::TimeType,
               required: false,
               description: 'Issues created before this date'

changelogs/unreleased/197227-milestone-tab-async.yml

+---
+title: Search issues in GraphQL API by milestone title and assignees
+merge_request: 25794
+author:
+type: added

doc/api/graphql/reference/gitlab_schema.graphql

@@ -5403,6 +5403,16 @@ type Project {
   A single issue of the project
   """
   issue(
+    """
+    ID of a user assigned to the issues, "none" and "any" values supported
+    """
+    assigneeId: String
+
+    """
+    Username of a user assigned to the issues
+    """
+    assigneeUsername: String
+
     """
     Issues closed after this date
     """
@@ -5438,6 +5448,11 @@ type Project {
     """
     labelName: [String]
 
+    """
+    Milestones applied to this issue
+    """
+    milestoneTitle: [String]
+
     """
     Search query for finding issues by title or description
     """
@@ -5473,6 +5488,16 @@ type Project {
     """
     after: String
 
+    """
+    ID of a user assigned to the issues, "none" and "any" values supported
+    """
+    assigneeId: String
+
+    """
+    Username of a user assigned to the issues
+    """
+    assigneeUsername: String
+
     """
     Returns the elements in the list that come before the specified cursor.
     """
@@ -5523,6 +5548,11 @@ type Project {
     """
     last: Int
 
+    """
+    Milestones applied to this issue
+    """
+    milestoneTitle: [String]
+
     """
     Search query for finding issues by title or description
     """

doc/api/graphql/reference/gitlab_schema.json

@@ -749,6 +749,40 @@
                   },
                   "defaultValue": null
                 },
+                {
+                  "name": "milestoneTitle",
+                  "description": "Milestones applied to this issue",
+                  "type": {
+                    "kind": "LIST",
+                    "name": null,
+                    "ofType": {
+                      "kind": "SCALAR",
+                      "name": "String",
+                      "ofType": null
+                    }
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "assigneeUsername",
+                  "description": "Username of a user assigned to the issues",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "assigneeId",
+                  "description": "ID of a user assigned to the issues, \"none\" and \"any\" values supported",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
                 {
                   "name": "createdBefore",
                   "description": "Issues created before this date",
@@ -894,6 +928,40 @@
                   },
                   "defaultValue": null
                 },
+                {
+                  "name": "milestoneTitle",
+                  "description": "Milestones applied to this issue",
+                  "type": {
+                    "kind": "LIST",
+                    "name": null,
+                    "ofType": {
+                      "kind": "SCALAR",
+                      "name": "String",
+                      "ofType": null
+                    }
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "assigneeUsername",
+                  "description": "Username of a user assigned to the issues",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
+                {
+                  "name": "assigneeId",
+                  "description": "ID of a user assigned to the issues, \"none\" and \"any\" values supported",
+                  "type": {
+                    "kind": "SCALAR",
+                    "name": "String",
+                    "ofType": null
+                  },
+                  "defaultValue": null
+                },
                 {
                   "name": "createdBefore",
                   "description": "Issues created before this date",

spec/graphql/resolvers/issues_resolver_spec.rb

@@ -9,8 +9,10 @@ describe Resolvers::IssuesResolver do
 
   context "with a project" do
     let_it_be(:project)   { create(:project) }
-    let_it_be(:issue1) { create(:issue, project: project, state: :opened, created_at: 3.hours.ago, updated_at: 3.hours.ago) }
-    let_it_be(:issue2) { create(:issue, project: project, state: :closed, title: 'foo', created_at: 1.hour.ago, updated_at: 1.hour.ago, closed_at: 1.hour.ago) }
+    let_it_be(:milestone) { create(:milestone, project: project) }
+    let_it_be(:assignee)  { create(:user) }
+    let_it_be(:issue1)    { create(:issue, project: project, state: :opened, created_at: 3.hours.ago, updated_at: 3.hours.ago, milestone: milestone) }
+    let_it_be(:issue2)    { create(:issue, project: project, state: :closed, title: 'foo', created_at: 1.hour.ago, updated_at: 1.hour.ago, closed_at: 1.hour.ago, assignees: [assignee]) }
     let_it_be(:label1)    { create(:label, project: project) }
     let_it_be(:label2)    { create(:label, project: project) }
 
@@ -31,6 +33,26 @@ describe Resolvers::IssuesResolver do
         expect(resolve_issues(state: 'closed')).to contain_exactly(issue2)
       end
 
+      it 'filters by milestone' do
+        expect(resolve_issues(milestone_title: milestone.title)).to contain_exactly(issue1)
+      end
+
+      it 'filters by assignee_username' do
+        expect(resolve_issues(assignee_username: assignee.username)).to contain_exactly(issue2)
+      end
+
+      it 'filters by assignee_id' do
+        expect(resolve_issues(assignee_id: assignee.id)).to contain_exactly(issue2)
+      end
+
+      it 'filters by any assignee' do
+        expect(resolve_issues(assignee_id: IssuableFinder::FILTER_ANY)).to contain_exactly(issue2)
+      end
+
+      it 'filters by no assignee' do
+        expect(resolve_issues(assignee_id: IssuableFinder::FILTER_NONE)).to contain_exactly(issue1)
+      end
+
       it 'filters by labels' do
         expect(resolve_issues(label_name: [label1.title])).to contain_exactly(issue1, issue2)
         expect(resolve_issues(label_name: [label1.title, label2.title])).to contain_exactly(issue2)