Merge branch 'master' into 22539-display-folders

* master: (26 commits)
  Remove extra subscribable_type filter on migration
  Add feature spec for labels subscription
  Avoid code duplication for label subscription status on label partial
  Rename LabelSubscription javascript to ProjectLabelSubscription
  Fix label subscription menu on small screens resolution
  Allow users to subscribe to a group label at group or project level
  Use button instead of an icon to subscribe/unsubscribe to labels
  Add CHANGELOG entry
  Add toggle_subscription action to Groups::LabelsController
  Allow subscriptions to be created without a project
  Use subqueries instead of joins to migrate subscriptions
  Add helper method to toggle label subscription on labels controller spec
  Remove default value for `project` argument on subscribable concern
  Use @project as default on ToggleSubscriptionAction concern
  Allow users to subscribe to group labels at project-level
  Pass project to Entities::Label to check if user is subscribed
  Fix specs to pass a project when creating subscriptions
  Refactoring label subscription toggle button text to accept a project
  Refactoring label subscription status to accept a project
  Refactoring notification service to find subscriptions per project
  ...

app/assets/javascripts/group_label_subscription.js.es6

+/* eslint-disable */
+(function(global) {
+  class GroupLabelSubscription {
+    constructor(container) {
+      const $container = $(container);
+      this.$dropdown = $container.find('.dropdown');
+      this.$subscribeButtons = $container.find('.js-subscribe-button');
+      this.$unsubscribeButtons = $container.find('.js-unsubscribe-button');
+
+      this.$subscribeButtons.on('click', this.subscribe.bind(this));
+      this.$unsubscribeButtons.on('click', this.unsubscribe.bind(this));
+    }
+
+    unsubscribe(event) {
+      event.preventDefault();
+
+      const url = this.$unsubscribeButtons.attr('data-url');
+
+      $.ajax({
+        type: 'POST',
+        url: url
+      }).done(() => {
+        this.toggleSubscriptionButtons();
+        this.$unsubscribeButtons.removeAttr('data-url');
+      });
+    }
+
+    subscribe(event) {
+      event.preventDefault();
+
+      const $btn = $(event.currentTarget);
+      const url = $btn.attr('data-url');
+
+      this.$unsubscribeButtons.attr('data-url', url);
+
+      $.ajax({
+        type: 'POST',
+        url: url
+      }).done(() => {
+        this.toggleSubscriptionButtons();
+      });
+    }
+
+    toggleSubscriptionButtons() {
+      this.$dropdown.toggleClass('hidden');
+      this.$subscribeButtons.toggleClass('hidden');
+      this.$unsubscribeButtons.toggleClass('hidden');
+    }
+  }
+
+  global.GroupLabelSubscription = GroupLabelSubscription;
+
+})(window.gl || (window.gl = {}));

app/assets/javascripts/project_label_subscription.js.es6

+/* eslint-disable */
+(function(global) {
+  class ProjectLabelSubscription {
+    constructor(container) {
+      this.$container = $(container);
+      this.$buttons = this.$container.find('.js-subscribe-button');
+
+      this.$buttons.on('click', this.toggleSubscription.bind(this));
+    }
+
+    toggleSubscription(event) {
+      event.preventDefault();
+
+      const $btn = $(event.currentTarget);
+      const $span = $btn.find('span');
+      const url = $btn.attr('data-url');
+      const oldStatus = $btn.attr('data-status');
+
+      $btn.addClass('disabled');
+      $span.toggleClass('hidden');
+
+      $.ajax({
+        type: 'POST',
+        url: url
+      }).done(() => {
+        let newStatus, newAction;
+
+        if (oldStatus === 'unsubscribed') {
+          [newStatus, newAction] = ['subscribed', 'Unsubscribe'];
+        } else {
+          [newStatus, newAction] = ['unsubscribed', 'Subscribe'];
+        }
+
+        $span.toggleClass('hidden');
+        $btn.removeClass('disabled');
+
+        this.$buttons.attr('data-status', newStatus);
+        this.$buttons.find('> span').text(newAction);
+
+        for (let button of this.$buttons) {
+          let $button = $(button);
+
+          if ($button.attr('data-original-title')) {
+            $button.tooltip('hide').attr('data-original-title', newAction).tooltip('fixTitle');
+          }
+        }
+      });
+    }
+  }
+
+  global.ProjectLabelSubscription = ProjectLabelSubscription;
+
+})(window.gl || (window.gl = {}));

app/assets/stylesheets/pages/labels.scss

@@ -90,7 +90,7 @@
 
     @media (min-width: $screen-sm-min) {
       display: inline-block;
-      width: 40%;
+      width: 30%;
       margin-left: 10px;
       margin-bottom: 0;
       vertical-align: middle;
@@ -222,6 +222,14 @@
   width: 100%;
 }
 
+.label-subscription {
+  vertical-align: middle;
+
+  .dropdown-group-label a {
+    cursor: pointer;
+  }
+}
+
 .label-subscribe-button {
   .label-subscribe-button-icon {
     &[disabled] {

app/controllers/concerns/toggle_subscription_action.rb

@@ -4,13 +4,17 @@ module ToggleSubscriptionAction
   def toggle_subscription
     return unless current_user
 
-    subscribable_resource.toggle_subscription(current_user)
+    subscribable_resource.toggle_subscription(current_user, subscribable_project)
 
     head :ok
   end
 
   private
 
+  def subscribable_project
+    @project || raise(NotImplementedError)
+  end
+
   def subscribable_resource
     raise NotImplementedError
   end

app/controllers/groups/labels_controller.rb

 class Groups::LabelsController < Groups::ApplicationController
+  include ToggleSubscriptionAction
+
   before_action :label, only: [:edit, :update, :destroy]
   before_action :authorize_admin_labels!, only: [:new, :create, :edit, :update, :destroy]
   before_action :save_previous_label_path, only: [:edit]
@@ -69,6 +71,11 @@ class Groups::LabelsController < Groups::ApplicationController
   def label
     @label ||= @group.labels.find(params[:id])
   end
+  alias_method :subscribable_resource, :label
+
+  def subscribable_project
+    nil
+  end
 
   def label_params
     params.require(:label).permit(:title, :description, :color)

app/controllers/projects/labels_controller.rb

@@ -3,7 +3,7 @@ class Projects::LabelsController < Projects::ApplicationController
 
   before_action :module_enabled
   before_action :label, only: [:edit, :update, :destroy]
-  before_action :find_labels, only: [:index, :set_priorities, :remove_priority]
+  before_action :find_labels, only: [:index, :set_priorities, :remove_priority, :toggle_subscription]
   before_action :authorize_read_label!
   before_action :authorize_admin_labels!, only: [:new, :create, :edit, :update,
                                                  :generate, :destroy, :remove_priority,
@@ -123,7 +123,10 @@ class Projects::LabelsController < Projects::ApplicationController
   def label
     @label ||= @project.labels.find(params[:id])
   end
-  alias_method :subscribable_resource, :label
+
+  def subscribable_resource
+    @available_labels.find(params[:id])
+  end
 
   def find_labels
     @available_labels ||= LabelsFinder.new(current_user, project_id: @project.id).execute

app/controllers/sent_notifications_controller.rb

@@ -12,7 +12,7 @@ class SentNotificationsController < ApplicationController
 
   def unsubscribe_and_redirect
     noteable = @sent_notification.noteable
-    noteable.unsubscribe(@sent_notification.recipient)
+    noteable.unsubscribe(@sent_notification.recipient, @sent_notification.project)
 
     flash[:notice] = "You have been unsubscribed from this thread."
 

app/helpers/labels_helper.rb

@@ -68,14 +68,6 @@ module LabelsHelper
     end
   end
 
-  def toggle_subscription_data(label)
-    return unless label.is_a?(ProjectLabel)
-
-    {
-      url: toggle_subscription_namespace_project_label_path(label.project.namespace, label.project, label)
-    }
-  end
-
   def render_colored_label(label, label_suffix = '', tooltip: true)
     label_color = label.color || Label::DEFAULT_COLOR
     text_color = text_color_for_bg(label_color)
@@ -148,20 +140,24 @@ module LabelsHelper
     end
   end
 
-  def label_subscription_status(label)
-    case label
-    when GroupLabel then 'Subscribing to group labels is currently not supported.'
-    when ProjectLabel then label.subscribed?(current_user) ? 'subscribed' : 'unsubscribed'
-    end
+  def label_subscription_status(label, project)
+    return 'project-level' if label.subscribed?(current_user, project)
+    return 'group-level' if label.subscribed?(current_user)
+
+    'unsubscribed'
   end
 
-  def label_subscription_toggle_button_text(label)
-    case label
-    when GroupLabel then 'Subscribing to group labels is currently not supported.'
-    when ProjectLabel then label.subscribed?(current_user) ? 'Unsubscribe' : 'Subscribe'
+  def group_label_unsubscribe_path(label, project)
+    case label_subscription_status(label, project)
+    when 'project-level' then toggle_subscription_namespace_project_label_path(@project.namespace, @project, label)
+    when 'group-level' then toggle_subscription_group_label_path(label.group, label)
     end
   end
 
+  def label_subscription_toggle_button_text(label, project)
+    label.subscribed?(current_user, project) ? 'Unsubscribe' : 'Subscribe'
+  end
+
   def label_deletion_confirm_text(label)
     case label
     when GroupLabel then 'Remove this label? This will affect all projects within the group. Are you sure?'

app/models/concerns/issuable.rb

@@ -215,7 +215,7 @@ module Issuable
     end
   end
 
-  def subscribed_without_subscriptions?(user)
+  def subscribed_without_subscriptions?(user, project)
     participants(user).include?(user)
   end
 

app/models/concerns/subscribable.rb

@@ -12,39 +12,71 @@ module Subscribable
     has_many :subscriptions, dependent: :destroy, as: :subscribable
   end
 
-  def subscribed?(user)
-    if subscription = subscriptions.find_by_user_id(user.id)
+  def subscribed?(user, project = nil)
+    if subscription = subscriptions.find_by(user: user, project: project)
       subscription.subscribed
     else
-      subscribed_without_subscriptions?(user)
+      subscribed_without_subscriptions?(user, project)
     end
   end
 
   # Override this method to define custom logic to consider a subscribable as
   # subscribed without an explicit subscription record.
-  def subscribed_without_subscriptions?(user)
+  def subscribed_without_subscriptions?(user, project)
     false
   end
 
-  def subscribers
-    subscriptions.where(subscribed: true).map(&:user)
+  def subscribers(project)
+    subscriptions_available(project).
+      where(subscribed: true).
+      map(&:user)
   end
 
-  def toggle_subscription(user)
-    subscriptions.
-      find_or_initialize_by(user_id: user.id).
-      update(subscribed: !subscribed?(user))
+  def toggle_subscription(user, project = nil)
+    unsubscribe_from_other_levels(user, project)
+
+    find_or_initialize_subscription(user, project).
+      update(subscribed: !subscribed?(user, project))
+  end
+
+  def subscribe(user, project = nil)
+    unsubscribe_from_other_levels(user, project)
+
+    find_or_initialize_subscription(user, project)
+      .update(subscribed: true)
+  end
+
+  def unsubscribe(user, project = nil)
+    unsubscribe_from_other_levels(user, project)
+
+    find_or_initialize_subscription(user, project)
+      .update(subscribed: false)
   end
 
-  def subscribe(user)
+  private
+
+  def unsubscribe_from_other_levels(user, project)
+    other_subscriptions = subscriptions.where(user: user)
+
+    other_subscriptions =
+      if project.blank?
+        other_subscriptions.where.not(project: nil)
+      else
+        other_subscriptions.where(project: nil)
+      end
+
+    other_subscriptions.update_all(subscribed: false)
+  end
+
+  def find_or_initialize_subscription(user, project)
     subscriptions.
-      find_or_initialize_by(user_id: user.id).
-      update(subscribed: true)
+      find_or_initialize_by(user_id: user.id, project_id: project.try(:id))
   end
 
-  def unsubscribe(user)
+  def subscriptions_available(project)
+    t = Subscription.arel_table
+
     subscriptions.
-      find_or_initialize_by(user_id: user.id).
-      update(subscribed: false)
+      where(t[:project_id].eq(nil).or(t[:project_id].eq(project.try(:id))))
   end
 end

app/models/issue.rb

@@ -266,7 +266,7 @@ class Issue < ActiveRecord::Base
 
   def as_json(options = {})
     super(options).tap do |json|
-      json[:subscribed] = subscribed?(options[:user]) if options.has_key?(:user) && options[:user]
+      json[:subscribed] = subscribed?(options[:user], project) if options.has_key?(:user) && options[:user]
 
       if options.has_key?(:labels)
         json[:labels] = labels.as_json(

app/models/subscription.rb

 class Subscription < ActiveRecord::Base
   belongs_to :user
+  belongs_to :project
   belongs_to :subscribable, polymorphic: true
 
-  validates :user_id,
-            uniqueness: { scope: [:subscribable_id, :subscribable_type] },
-            presence: true
+  validates :user, :subscribable, presence: true
+
+  validates :project_id, uniqueness: { scope: [:subscribable_id, :subscribable_type, :user_id] }
 end

app/services/issuable_base_service.rb

@@ -212,9 +212,9 @@ class IssuableBaseService < BaseService
   def change_subscription(issuable)
     case params.delete(:subscription_event)
     when 'subscribe'
-      issuable.subscribe(current_user)
+      issuable.subscribe(current_user, project)
     when 'unsubscribe'
-      issuable.unsubscribe(current_user)
+      issuable.unsubscribe(current_user, project)
     end
   end
 

app/services/notification_service.rb

@@ -75,7 +75,7 @@ class NotificationService
   #  * watchers of the issue's labels
   #
   def relabeled_issue(issue, added_labels, current_user)
-    relabeled_resource_email(issue, added_labels, current_user, :relabeled_issue_email)
+    relabeled_resource_email(issue, issue.project, added_labels, current_user, :relabeled_issue_email)
   end
 
   # When create a merge request we should send an email to:
@@ -118,7 +118,7 @@ class NotificationService
   #  * watchers of the mr's labels
   #
   def relabeled_merge_request(merge_request, added_labels, current_user)
-    relabeled_resource_email(merge_request, added_labels, current_user, :relabeled_merge_request_email)
+    relabeled_resource_email(merge_request, merge_request.target_project, added_labels, current_user, :relabeled_merge_request_email)
   end
 
   def close_mr(merge_request, current_user)
@@ -205,7 +205,7 @@ class NotificationService
 
     recipients = reject_muted_users(recipients, note.project)
 
-    recipients = add_subscribed_users(recipients, note.noteable)
+    recipients = add_subscribed_users(recipients, note.project, note.noteable)
     recipients = reject_unsubscribed_users(recipients, note.noteable)
     recipients = reject_users_without_access(recipients, note.noteable)
 
@@ -393,7 +393,7 @@ class NotificationService
     )
   end
 
-  # Build a list of users based on project notifcation settings
+  # Build a list of users based on project notification settings
   def select_project_member_setting(project, global_setting, users_global_level_watch)
     users = notification_settings_for(project, :watch)
 
@@ -505,17 +505,17 @@ class NotificationService
     end
   end
 
-  def add_subscribed_users(recipients, target)
+  def add_subscribed_users(recipients, project, target)
     return recipients unless target.respond_to? :subscribers
 
-    recipients + target.subscribers
+    recipients + target.subscribers(project)
   end
 
-  def add_labels_subscribers(recipients, target, labels: nil)
+  def add_labels_subscribers(recipients, project, target, labels: nil)
     return recipients unless target.respond_to? :labels
 
     (labels || target.labels).each do |label|
-      recipients += label.subscribers
+      recipients += label.subscribers(project)
     end
 
     recipients
@@ -571,8 +571,8 @@ class NotificationService
     end
   end
 
-  def relabeled_resource_email(target, labels, current_user, method)
-    recipients = build_relabeled_recipients(target, current_user, labels: labels)
+  def relabeled_resource_email(target, project, labels, current_user, method)
+    recipients = build_relabeled_recipients(target, project, current_user, labels: labels)
     label_names = labels.map(&:name)
 
     recipients.each do |recipient|
@@ -608,10 +608,10 @@ class NotificationService
     end
 
     recipients = reject_muted_users(recipients, project)
-    recipients = add_subscribed_users(recipients, target)
+    recipients = add_subscribed_users(recipients, project, target)
 
     if [:new_issue, :new_merge_request].include?(custom_action)
-      recipients = add_labels_subscribers(recipients, target)
+      recipients = add_labels_subscribers(recipients, project, target)
     end
 
     recipients = reject_unsubscribed_users(recipients, target)
@@ -622,8 +622,8 @@ class NotificationService
     recipients.uniq
   end
 
-  def build_relabeled_recipients(target, current_user, labels:)
-    recipients = add_labels_subscribers([], target, labels: labels)
+  def build_relabeled_recipients(target, project, current_user, labels:)
+    recipients = add_labels_subscribers([], project, target, labels: labels)
     recipients = reject_unsubscribed_users(recipients, target)
     recipients = reject_users_without_access(recipients, target)
     recipients.delete(current_user)

app/services/slash_commands/interpret_service.rb

@@ -193,7 +193,7 @@ module SlashCommands
     desc 'Subscribe'
     condition do
       issuable.persisted? &&
-        !issuable.subscribed?(current_user)
+        !issuable.subscribed?(current_user, project)
     end
     command :subscribe do
       @updates[:subscription_event] = 'subscribe'
@@ -202,7 +202,7 @@ module SlashCommands
     desc 'Unsubscribe'
     condition do
       issuable.persisted? &&
-        issuable.subscribed?(current_user)
+        issuable.subscribed?(current_user, project)
     end
     command :unsubscribe do
       @updates[:subscription_event] = 'unsubscribe'

app/views/shared/_label.html.haml

 - label_css_id = dom_id(label)
 - open_issues_count = label.open_issues_count(current_user)
 - open_merge_requests_count = label.open_merge_requests_count(current_user)
+- status = label_subscription_status(label, @project).inquiry if current_user
 - subject = local_assigns[:subject]
 
 %li{id: label_css_id, data: { id: label.id } }
@@ -18,10 +19,19 @@
         %li
           = link_to_label(label, subject: subject) do
             = pluralize open_issues_count, 'open issue'
-        - if current_user
-          %li.label-subscription{ data: toggle_subscription_data(label) }
-            %a.js-subscribe-button.label-subscribe-button.subscription-status{ role: "button", href: "#", data: { toggle: "tooltip", status: label_subscription_status(label) } }
-              %span= label_subscription_toggle_button_text(label)
+        - if current_user && defined?(@project)
+          %li.label-subscription
+            - if label.is_a?(ProjectLabel)
+              %a.js-subscribe-button.label-subscribe-button{ role: 'button', href: '#', data: { status: status, url: toggle_subscription_namespace_project_label_path(@project.namespace, @project, label) } }
+                %span= label_subscription_toggle_button_text(label, @project)
+            - else
+              %a.js-unsubscribe-button.label-subscribe-button{ role: 'button', href: '#', class: ('hidden' if status.unsubscribed?), data: { url: group_label_unsubscribe_path(label, @project) } }
+                %span Unsubscribe
+              %a.js-subscribe-button.label-subscribe-button{ role: 'button', href: '#', class: ('hidden' unless status.unsubscribed?), data: { url: toggle_subscription_namespace_project_label_path(@project.namespace, @project, label) } }
+                %span Subscribe at project level
+              %a.js-subscribe-button.label-subscribe-button{ role: 'button', href: '#', class: ('hidden' unless status.unsubscribed?), data: { url: toggle_subscription_group_label_path(label.group, label) } }
+                %span Subscribe at group level
+
         - if can?(current_user, :admin_label, label)
           %li
             = link_to 'Edit', edit_label_path(label)
@@ -34,13 +44,28 @@
     = link_to_label(label, subject: subject, css_class: 'btn btn-transparent btn-action') do
       = pluralize open_issues_count, 'open issue'
 
-    - if current_user
-      .label-subscription.inline{ data: toggle_subscription_data(label) }
-        %button.js-subscribe-button.label-subscribe-button.btn.btn-transparent.btn-action.subscription-status{ type: "button", title: label_subscription_toggle_button_text(label), data: { toggle: "tooltip", status: label_subscription_status(label) } }
-          %span.sr-only= label_subscription_toggle_button_text(label)
-          = icon('eye', class: 'label-subscribe-button-icon', disabled: label.is_a?(GroupLabel))
+    - if current_user && defined?(@project)
+      .label-subscription.inline
+        - if label.is_a?(ProjectLabel)
+          %button.js-subscribe-button.label-subscribe-button.btn.btn-default.btn-action{ type: 'button', title: label_subscription_toggle_button_text(label, @project), data: { toggle: 'tooltip', status: status, url: toggle_subscription_namespace_project_label_path(@project.namespace, @project, label) } }
+            %span= label_subscription_toggle_button_text(label, @project)
+            = icon('spinner spin', class: 'label-subscribe-button-loading')
+        - else
+          %button.js-unsubscribe-button.label-subscribe-button.btn.btn-default.btn-action{ type: 'button', class: ('hidden' if status.unsubscribed?), title: 'Unsubscribe', data: { toggle: 'tooltip', url: group_label_unsubscribe_path(label, @project) } }
+            %span Unsubscribe
             = icon('spinner spin', class: 'label-subscribe-button-loading')
 
+          .dropdown.dropdown-group-label{ class: ('hidden' unless status.unsubscribed?) }
+            %button.dropdown-menu-toggle{type: 'button', 'data-toggle' => 'dropdown'}
+              %span Subscribe
+              = icon('chevron-down')
+            %ul.dropdown-menu
+              %li
+                %a.js-subscribe-button{ data: { url: toggle_subscription_namespace_project_label_path(@project.namespace, @project, label) } }
+                  Project level
+                %a.js-subscribe-button{ data: { url: toggle_subscription_group_label_path(label.group, label) } }
+                  Group level
+
     - if can?(current_user, :admin_label, label)
       = link_to edit_label_path(label), title: "Edit", class: 'btn btn-transparent btn-action', data: {toggle: "tooltip"} do
         %span.sr-only Edit
@@ -49,6 +74,10 @@
         %span.sr-only Delete
         = icon('trash-o')
 
-  - if current_user && label.is_a?(ProjectLabel)
+  - if current_user && defined?(@project)
+    - if label.is_a?(ProjectLabel)
+      :javascript
+        new gl.ProjectLabelSubscription('##{dom_id(label)} .label-subscription');
+    - else
       :javascript
-      new Subscription('##{dom_id(label)} .label-subscription');
+        new gl.GroupLabelSubscription('##{dom_id(label)} .label-subscription');

app/views/shared/issuable/_sidebar.html.haml

@@ -140,7 +140,7 @@
 
       = render "shared/issuable/participants", participants: issuable.participants(current_user)
       - if current_user
-        - subscribed = issuable.subscribed?(current_user)
+        - subscribed = issuable.subscribed?(current_user, @project)
         .block.light.subscription{data: {url: toggle_subscription_path(issuable)}}
           .sidebar-collapsed-icon
             = icon('rss')

changelogs/unreleased/feature-subscribe-to-group-level-labels.yml

+---
+title: Allow users to subscribe to group labels
+merge_request: 7215
+author: 

config/routes/group.rb

@@ -30,7 +30,10 @@ scope(path: 'groups/:group_id', module: :groups, as: :group) do
 
   resource :avatar, only: [:destroy]
   resources :milestones, constraints: { id: /[^\/]+/ }, only: [:index, :show, :update, :new, :create]
-  resources :labels, except: [:show], constraints: { id: /\d+/ }
+
+  resources :labels, except: [:show], constraints: { id: /\d+/ } do
+    post :toggle_subscription, on: :member
+  end
 end
 
 # Must be last route in this file

db/migrate/20161031171301_add_project_id_to_subscriptions.rb

+class AddProjectIdToSubscriptions < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  def up
+    add_column :subscriptions, :project_id, :integer
+    add_foreign_key :subscriptions, :projects, column: :project_id, on_delete: :cascade
+  end
+
+  def down
+    remove_column :subscriptions, :project_id
+  end
+end

db/migrate/20161031174110_migrate_subscriptions_project_id.rb

+class MigrateSubscriptionsProjectId < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = true
+  DOWNTIME_REASON = 'Subscriptions will not work as expected until this migration is complete.'
+
+  def up
+    execute <<-EOF.strip_heredoc
+      UPDATE subscriptions
+      SET project_id = (
+        SELECT issues.project_id
+        FROM issues
+        WHERE issues.id = subscriptions.subscribable_id
+      )
+      WHERE subscriptions.subscribable_type = 'Issue';
+    EOF
+
+    execute <<-EOF.strip_heredoc
+      UPDATE subscriptions
+      SET project_id = (
+        SELECT merge_requests.target_project_id
+        FROM merge_requests
+        WHERE merge_requests.id = subscriptions.subscribable_id
+      )
+      WHERE subscriptions.subscribable_type = 'MergeRequest';
+    EOF
+
+    execute <<-EOF.strip_heredoc
+      UPDATE subscriptions
+      SET project_id = (
+        SELECT projects.id
+        FROM labels INNER JOIN projects ON projects.id = labels.project_id
+        WHERE labels.id = subscriptions.subscribable_id
+      )
+      WHERE subscriptions.subscribable_type = 'Label';
+    EOF
+  end
+
+  def down
+    execute <<-EOF.strip_heredoc
+      UPDATE subscriptions SET project_id = NULL;
+    EOF
+  end
+end

db/migrate/20161031181638_add_unique_index_to_subscriptions.rb

+class AddUniqueIndexToSubscriptions < ActiveRecord::Migration
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = true
+  DOWNTIME_REASON = 'This migration requires downtime because it changes a column to not accept null values.'
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_index :subscriptions, [:subscribable_id, :subscribable_type, :user_id, :project_id], { unique: true, name: 'index_subscriptions_on_subscribable_and_user_id_and_project_id' }
+    remove_index :subscriptions, name: 'subscriptions_user_id_and_ref_fields' if index_name_exists?(:subscriptions, 'subscriptions_user_id_and_ref_fields', false)
+  end
+
+  def down
+    add_concurrent_index :subscriptions, [:subscribable_id, :subscribable_type, :user_id], { unique: true, name: 'subscriptions_user_id_and_ref_fields' }
+    remove_index :subscriptions, name: 'index_subscriptions_on_subscribable_and_user_id_and_project_id' if index_name_exists?(:subscriptions, 'index_subscriptions_on_subscribable_and_user_id_and_project_id', false)
+  end
+end

db/schema.rb

@@ -1070,9 +1070,10 @@ ActiveRecord::Schema.define(version: 20161113184239) do
     t.boolean "subscribed"
     t.datetime "created_at"
     t.datetime "updated_at"
+    t.integer "project_id"
   end
 
-  add_index "subscriptions", ["subscribable_id", "subscribable_type", "user_id"], name: "subscriptions_user_id_and_ref_fields", unique: true, using: :btree
+  add_index "subscriptions", ["subscribable_id", "subscribable_type", "user_id", "project_id"], name: "index_subscriptions_on_subscribable_and_user_id_and_project_id", unique: true, using: :btree
 
   create_table "taggings", force: :cascade do |t|
     t.integer "tag_id"
@@ -1268,6 +1269,7 @@ ActiveRecord::Schema.define(version: 20161113184239) do
   add_foreign_key "personal_access_tokens", "users"
   add_foreign_key "protected_branch_merge_access_levels", "protected_branches"
   add_foreign_key "protected_branch_push_access_levels", "protected_branches"
+  add_foreign_key "subscriptions", "projects", on_delete: :cascade
   add_foreign_key "trending_projects", "projects", on_delete: :cascade
   add_foreign_key "u2f_registrations", "users"
 end

lib/api/entities.rb

@@ -218,7 +218,7 @@ module API
       expose :assignee, :author, using: Entities::UserBasic
 
       expose :subscribed do |issue, options|
-        issue.subscribed?(options[:current_user])
+        issue.subscribed?(options[:current_user], options[:project] || issue.project)
       end
       expose :user_notes_count
       expose :upvotes, :downvotes
@@ -248,7 +248,7 @@ module API
       expose :diff_head_sha, as: :sha
       expose :merge_commit_sha
       expose :subscribed do |merge_request, options|
-        merge_request.subscribed?(options[:current_user])
+        merge_request.subscribed?(options[:current_user], options[:project])
       end
       expose :user_notes_count
       expose :should_remove_source_branch?, as: :should_remove_source_branch
@@ -454,7 +454,7 @@ module API
       end
 
       expose :subscribed do |label, options|
-        label.subscribed?(options[:current_user])
+        label.subscribed?(options[:current_user], options[:project])
       end
     end
 

lib/api/issues.rb

@@ -120,7 +120,7 @@ module API
 
         issues = issues.reorder(issuable_order_by => issuable_sort)
 
-        present paginate(issues), with: Entities::Issue, current_user: current_user
+        present paginate(issues), with: Entities::Issue, current_user: current_user, project: user_project
       end
 
       # Get a single project issue
@@ -132,7 +132,7 @@ module API
       #   GET /projects/:id/issues/:issue_id
       get ":id/issues/:issue_id" do
         @issue = find_project_issue(params[:issue_id])
-        present @issue, with: Entities::Issue, current_user: current_user
+        present @issue, with: Entities::Issue, current_user: current_user, project: user_project
       end
 
       # Create a new project issue
@@ -174,7 +174,7 @@ module API
         end
 
         if issue.valid?
-          present issue, with: Entities::Issue, current_user: current_user
+          present issue, with: Entities::Issue, current_user: current_user, project: user_project
         else
           render_validation_error!(issue)
         end
@@ -217,7 +217,7 @@ module API
         issue = ::Issues::UpdateService.new(user_project, current_user, attrs).execute(issue)
 
         if issue.valid?
-          present issue, with: Entities::Issue, current_user: current_user
+          present issue, with: Entities::Issue, current_user: current_user, project: user_project
         else
           render_validation_error!(issue)
         end
@@ -239,7 +239,7 @@ module API
 
         begin
           issue = ::Issues::MoveService.new(user_project, current_user).execute(issue, new_project)
-          present issue, with: Entities::Issue, current_user: current_user
+          present issue, with: Entities::Issue, current_user: current_user, project: user_project
         rescue ::Issues::MoveService::MoveError => error
           render_api_error!(error.message, 400)
         end

lib/api/merge_requests.rb

@@ -60,7 +60,7 @@ module API
           end
 
         merge_requests = merge_requests.reorder(issuable_order_by => issuable_sort)
-        present paginate(merge_requests), with: Entities::MergeRequest, current_user: current_user
+        present paginate(merge_requests), with: Entities::MergeRequest, current_user: current_user, project: user_project
       end
 
       desc 'Create a merge request' do
@@ -87,7 +87,7 @@ module API
         merge_request = ::MergeRequests::CreateService.new(user_project, current_user, mr_params).execute
 
         if merge_request.valid?
-          present merge_request, with: Entities::MergeRequest, current_user: current_user
+          present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
         else
           handle_merge_request_errors! merge_request.errors
         end
@@ -120,7 +120,7 @@ module API
         get path do
           merge_request = user_project.merge_requests.find(params[:merge_request_id])
           authorize! :read_merge_request, merge_request
-          present merge_request, with: Entities::MergeRequest, current_user: current_user
+          present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
         end
 
         desc 'Get the commits of a merge request' do
@@ -167,7 +167,7 @@ module API
           merge_request = ::MergeRequests::UpdateService.new(user_project, current_user, mr_params).execute(merge_request)
 
           if merge_request.valid?
-            present merge_request, with: Entities::MergeRequest, current_user: current_user
+            present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
           else
             handle_merge_request_errors! merge_request.errors
           end
@@ -212,7 +212,7 @@ module API
               execute(merge_request)
           end
 
-          present merge_request, with: Entities::MergeRequest, current_user: current_user
+          present merge_request, with: Entities::MergeRequest, current_user: current_user, project: user_project
         end
 
         desc 'Cancel merge if "Merge when build succeeds" is enabled' do

lib/api/milestones.rb

@@ -114,7 +114,7 @@ module API
         }
 
         issues = IssuesFinder.new(current_user, finder_params).execute
-        present paginate(issues), with: Entities::Issue, current_user: current_user
+        present paginate(issues), with: Entities::Issue, current_user: current_user, project: user_project
       end
     end
   end

lib/api/subscriptions.rb

@@ -24,11 +24,11 @@ module API
         post ":id/#{type}/:subscribable_id/subscription" do
           resource = instance_exec(params[:subscribable_id], &finder)
 
-          if resource.subscribed?(current_user)
+          if resource.subscribed?(current_user, user_project)
             not_modified!
           else
-            resource.subscribe(current_user)
-            present resource, with: entity_class, current_user: current_user
+            resource.subscribe(current_user, user_project)
+            present resource, with: entity_class, current_user: current_user, project: user_project
           end
         end
 
@@ -38,11 +38,11 @@ module API
         delete ":id/#{type}/:subscribable_id/subscription" do
           resource = instance_exec(params[:subscribable_id], &finder)
 
-          if !resource.subscribed?(current_user)
+          if !resource.subscribed?(current_user, user_project)
             not_modified!
           else
-            resource.unsubscribe(current_user)
-            present resource, with: entity_class, current_user: current_user
+            resource.unsubscribe(current_user, user_project)
+            present resource, with: entity_class, current_user: current_user, project: user_project
           end
         end
       end

spec/controllers/groups/labels_controller_spec.rb

+require 'spec_helper'
+
+describe Groups::LabelsController do
+  let(:group) { create(:group) }
+  let(:user)  { create(:user) }
+
+  before do
+    group.add_owner(user)
+
+    sign_in(user)
+  end
+
+  describe 'POST #toggle_subscription' do
+    it 'allows user to toggle subscription on group labels' do
+      label = create(:group_label, group: group)
+
+      post :toggle_subscription, group_id: group.to_param, id: label.to_param
+
+      expect(response).to have_http_status(200)
+    end
+  end
+end

spec/controllers/projects/boards/issues_controller_spec.rb

@@ -25,7 +25,7 @@ describe Projects::Boards::IssuesController do
         create(:labeled_issue, project: project, labels: [planning])
         create(:labeled_issue, project: project, labels: [development], due_date: Date.tomorrow)
         create(:labeled_issue, project: project, labels: [development], assignee: johndoe)
-        issue.subscribe(johndoe)
+        issue.subscribe(johndoe, project)
 
         list_issues user: user, board: board, list: list2
 

spec/controllers/projects/labels_controller_spec.rb

@@ -72,14 +72,8 @@ describe Projects::LabelsController do
   end
 
   describe 'POST #generate' do
-    let(:admin) { create(:admin) }
-
-    before do
-      sign_in(admin)
-    end
-
     context 'personal project' do
-      let(:personal_project) { create(:empty_project) }
+      let(:personal_project) { create(:empty_project, namespace: user.namespace) }
 
       it 'creates labels' do
         post :generate, namespace_id: personal_project.namespace.to_param, project_id: personal_project.to_param
@@ -96,4 +90,26 @@ describe Projects::LabelsController do
       end
     end
   end
+
+  describe 'POST #toggle_subscription' do
+    it 'allows user to toggle subscription on project labels' do
+      label = create(:label, project: project)
+
+      toggle_subscription(label)
+
+      expect(response).to have_http_status(200)
+    end
+
+    it 'allows user to toggle subscription on group labels' do
+      group_label = create(:group_label, group: group)
+
+      toggle_subscription(group_label)
+
+      expect(response).to have_http_status(200)
+    end
+
+    def toggle_subscription(label)
+      post :toggle_subscription, namespace_id: project.namespace.to_param, project_id: project.to_param, id: label.to_param
+    end
+  end
 end

spec/controllers/sent_notifications_controller_spec.rb

@@ -3,11 +3,11 @@ require 'rails_helper'
 describe SentNotificationsController, type: :controller do
   let(:user) { create(:user) }
   let(:project) { create(:empty_project) }
-  let(:sent_notification) { create(:sent_notification, noteable: issue, recipient: user) }
+  let(:sent_notification) { create(:sent_notification, project: project, noteable: issue, recipient: user) }
 
   let(:issue) do
     create(:issue, project: project, author: user) do |issue|
-      issue.subscriptions.create(user: user, subscribed: true)
+      issue.subscriptions.create(user: user, project: project, subscribed: true)
     end
   end
 
@@ -17,7 +17,7 @@ describe SentNotificationsController, type: :controller do
         before { get(:unsubscribe, id: sent_notification.reply_key, force: true) }
 
         it 'unsubscribes the user' do
-          expect(issue.subscribed?(user)).to be_falsey
+          expect(issue.subscribed?(user, project)).to be_falsey
         end
 
         it 'sets the flash message' do
@@ -33,7 +33,7 @@ describe SentNotificationsController, type: :controller do
         before { get(:unsubscribe, id: sent_notification.reply_key) }
 
         it 'does not unsubscribe the user' do
-          expect(issue.subscribed?(user)).to be_truthy
+          expect(issue.subscribed?(user, project)).to be_truthy
         end
 
         it 'does not set the flash message' do
@@ -53,7 +53,7 @@ describe SentNotificationsController, type: :controller do
         before { get(:unsubscribe, id: sent_notification.reply_key.reverse) }
 
         it 'does not unsubscribe the user' do
-          expect(issue.subscribed?(user)).to be_truthy
+          expect(issue.subscribed?(user, project)).to be_truthy
         end
 
         it 'does not set the flash message' do
@@ -69,7 +69,7 @@ describe SentNotificationsController, type: :controller do
         before { get(:unsubscribe, id: sent_notification.reply_key, force: true) }
 
         it 'unsubscribes the user' do
-          expect(issue.subscribed?(user)).to be_falsey
+          expect(issue.subscribed?(user, project)).to be_falsey
         end
 
         it 'sets the flash message' do
@@ -85,14 +85,14 @@ describe SentNotificationsController, type: :controller do
       context 'when the force param is not passed' do
         let(:merge_request) do
           create(:merge_request, source_project: project, author: user) do |merge_request|
-            merge_request.subscriptions.create(user: user, subscribed: true)
+            merge_request.subscriptions.create(user: user, project: project, subscribed: true)
           end
         end
-        let(:sent_notification) { create(:sent_notification, noteable: merge_request, recipient: user) }
+        let(:sent_notification) { create(:sent_notification, project: project, noteable: merge_request, recipient: user) }
         before { get(:unsubscribe, id: sent_notification.reply_key) }
 
         it 'unsubscribes the user' do
-          expect(merge_request.subscribed?(user)).to be_falsey
+          expect(merge_request.subscribed?(user, project)).to be_falsey
         end
 
         it 'sets the flash message' do

spec/factories/subscriptions.rb

+FactoryGirl.define do
+  factory :subscription do
+    user
+    project factory: :empty_project
+    subscribable factory: :issue
+  end
+end

spec/features/projects/labels/subscription_spec.rb

+require 'spec_helper'
+
+feature 'Labels subscription', feature: true do
+  let(:user)     { create(:user) }
+  let(:group)    { create(:group) }
+  let(:project)  { create(:empty_project, :public, namespace: group) }
+  let!(:bug)     { create(:label, project: project, title: 'bug') }
+  let!(:feature) { create(:group_label, group: group, title: 'feature') }
+
+  context 'when signed in' do
+    before do
+      project.team << [user, :developer]
+      login_as user
+    end
+
+    scenario 'users can subscribe/unsubscribe to labels', js: true do
+      visit namespace_project_labels_path(project.namespace, project)
+
+      expect(page).to have_content('bug')
+      expect(page).to have_content('feature')
+
+      within "#project_label_#{bug.id}" do
+        expect(page).not_to have_button 'Unsubscribe'
+
+        click_button 'Subscribe'
+
+        expect(page).not_to have_button 'Subscribe'
+        expect(page).to have_button 'Unsubscribe'
+
+        click_button 'Unsubscribe'
+
+        expect(page).to have_button 'Subscribe'
+        expect(page).not_to have_button 'Unsubscribe'
+      end
+
+      within "#group_label_#{feature.id}" do
+        expect(page).not_to have_button 'Unsubscribe'
+
+        click_link_on_dropdown('Group level')
+
+        expect(page).not_to have_selector('.dropdown-group-label')
+        expect(page).to have_button 'Unsubscribe'
+
+        click_button 'Unsubscribe'
+
+        expect(page).to have_selector('.dropdown-group-label')
+
+        click_link_on_dropdown('Project level')
+
+        expect(page).not_to have_selector('.dropdown-group-label')
+        expect(page).to have_button 'Unsubscribe'
+      end
+    end
+  end
+
+  context 'when not signed in' do
+    it 'users can not subscribe/unsubscribe to labels' do
+      visit namespace_project_labels_path(project.namespace, project)
+
+      expect(page).to have_content 'bug'
+      expect(page).to have_content 'feature'
+      expect(page).not_to have_button('Subscribe')
+      expect(page).not_to have_selector('.dropdown-group-label')
+    end
+  end
+
+  def click_link_on_dropdown(text)
+    find('.dropdown-group-label').click
+
+    page.within('.dropdown-group-label') do
+      find('a.js-subscribe-button', text: text).click
+    end
+  end
+end

spec/features/unsubscribe_links_spec.rb

@@ -26,11 +26,11 @@ describe 'Unsubscribe links', feature: true do
         expect(current_path).to eq unsubscribe_sent_notification_path(SentNotification.last)
         expect(page).to have_text(%(Unsubscribe from issue #{issue.title} (#{issue.to_reference})))
         expect(page).to have_text(%(Are you sure you want to unsubscribe from issue #{issue.title} (#{issue.to_reference})?))
-        expect(issue.subscribed?(recipient)).to be_truthy
+        expect(issue.subscribed?(recipient, project)).to be_truthy
 
         click_link 'Unsubscribe'
 
-        expect(issue.subscribed?(recipient)).to be_falsey
+        expect(issue.subscribed?(recipient, project)).to be_falsey
         expect(current_path).to eq new_user_session_path
       end
 
@@ -38,11 +38,11 @@ describe 'Unsubscribe links', feature: true do
         visit body_link
 
         expect(current_path).to eq unsubscribe_sent_notification_path(SentNotification.last)
-        expect(issue.subscribed?(recipient)).to be_truthy
+        expect(issue.subscribed?(recipient, project)).to be_truthy
 
         click_link 'Cancel'
 
-        expect(issue.subscribed?(recipient)).to be_truthy
+        expect(issue.subscribed?(recipient, project)).to be_truthy
         expect(current_path).to eq new_user_session_path
       end
     end
@@ -51,7 +51,7 @@ describe 'Unsubscribe links', feature: true do
       visit header_link
 
       expect(page).to have_text('unsubscribed')
-      expect(issue.subscribed?(recipient)).to be_falsey
+      expect(issue.subscribed?(recipient, project)).to be_falsey
     end
   end
 
@@ -62,14 +62,14 @@ describe 'Unsubscribe links', feature: true do
       visit body_link
 
       expect(page).to have_text('unsubscribed')
-      expect(issue.subscribed?(recipient)).to be_falsey
+      expect(issue.subscribed?(recipient, project)).to be_falsey
     end
 
     it 'unsubscribes from the issue when visiting the link from the header' do
       visit header_link
 
       expect(page).to have_text('unsubscribed')
-      expect(issue.subscribed?(recipient)).to be_falsey
+      expect(issue.subscribed?(recipient, project)).to be_falsey
     end
   end
 end

spec/models/concerns/issuable_spec.rb

@@ -176,23 +176,25 @@ describe Issue, "Issuable" do
   end
 
   describe '#subscribed?' do
+    let(:project) { issue.project }
+
     context 'user is not a participant in the issue' do
       before { allow(issue).to receive(:participants).with(user).and_return([]) }
 
       it 'returns false when no subcription exists' do
-        expect(issue.subscribed?(user)).to be_falsey
+        expect(issue.subscribed?(user, project)).to be_falsey
       end
 
       it 'returns true when a subcription exists and subscribed is true' do
-        issue.subscriptions.create(user: user, subscribed: true)
+        issue.subscriptions.create(user: user, project: project, subscribed: true)
 
-        expect(issue.subscribed?(user)).to be_truthy
+        expect(issue.subscribed?(user, project)).to be_truthy
       end
 
       it 'returns false when a subcription exists and subscribed is false' do
-        issue.subscriptions.create(user: user, subscribed: false)
+        issue.subscriptions.create(user: user, project: project, subscribed: false)
 
-        expect(issue.subscribed?(user)).to be_falsey
+        expect(issue.subscribed?(user, project)).to be_falsey
       end
     end
 
@@ -200,19 +202,19 @@ describe Issue, "Issuable" do
       before { allow(issue).to receive(:participants).with(user).and_return([user]) }
 
       it 'returns false when no subcription exists' do
-        expect(issue.subscribed?(user)).to be_truthy
+        expect(issue.subscribed?(user, project)).to be_truthy
       end
 
       it 'returns true when a subcription exists and subscribed is true' do
-        issue.subscriptions.create(user: user, subscribed: true)
+        issue.subscriptions.create(user: user, project: project, subscribed: true)
 
-        expect(issue.subscribed?(user)).to be_truthy
+        expect(issue.subscribed?(user, project)).to be_truthy
       end
 
       it 'returns false when a subcription exists and subscribed is false' do
-        issue.subscriptions.create(user: user, subscribed: false)
+        issue.subscriptions.create(user: user, project: project, subscribed: false)
 
-        expect(issue.subscribed?(user)).to be_falsey
+        expect(issue.subscribed?(user, project)).to be_falsey
       end
     end
   end

spec/models/concerns/subscribable_spec.rb

 require 'spec_helper'
 
 describe Subscribable, 'Subscribable' do
-  let(:resource) { create(:issue) }
-  let(:user) { create(:user) }
+  let(:project)  { create(:empty_project) }
+  let(:resource) { create(:issue, project: project) }
+  let(:user_1)   { create(:user) }
 
   describe '#subscribed?' do
-    it 'returns false when no subcription exists' do
-      expect(resource.subscribed?(user)).to be_falsey
+    context 'without project' do
+      it 'returns false when no subscription exists' do
+        expect(resource.subscribed?(user_1)).to be_falsey
       end
 
       it 'returns true when a subcription exists and subscribed is true' do
-      resource.subscriptions.create(user: user, subscribed: true)
+        resource.subscriptions.create(user: user_1, subscribed: true)
 
-      expect(resource.subscribed?(user)).to be_truthy
+        expect(resource.subscribed?(user_1)).to be_truthy
       end
 
       it 'returns false when a subcription exists and subscribed is false' do
-      resource.subscriptions.create(user: user, subscribed: false)
+        resource.subscriptions.create(user: user_1, subscribed: false)
 
-      expect(resource.subscribed?(user)).to be_falsey
+        expect(resource.subscribed?(user_1)).to be_falsey
       end
     end
+
+    context 'with project' do
+      it 'returns false when no subscription exists' do
+        expect(resource.subscribed?(user_1, project)).to be_falsey
+      end
+
+      it 'returns true when a subcription exists and subscribed is true' do
+        resource.subscriptions.create(user: user_1, project: project, subscribed: true)
+
+        expect(resource.subscribed?(user_1, project)).to be_truthy
+      end
+
+      it 'returns false when a subcription exists and subscribed is false' do
+        resource.subscriptions.create(user: user_1, project: project, subscribed: false)
+
+        expect(resource.subscribed?(user_1, project)).to be_falsey
+      end
+    end
+  end
+
   describe '#subscribers' do
     it 'returns [] when no subcribers exists' do
-      expect(resource.subscribers).to be_empty
+      expect(resource.subscribers(project)).to be_empty
     end
 
     it 'returns the subscribed users' do
-      resource.subscriptions.create(user: user, subscribed: true)
-      resource.subscriptions.create(user: create(:user), subscribed: false)
+      user_2 = create(:user)
+      resource.subscriptions.create(user: user_1, subscribed: true)
+      resource.subscriptions.create(user: user_2, project: project, subscribed: true)
+      resource.subscriptions.create(user: create(:user), project: project, subscribed: false)
 
-      expect(resource.subscribers).to eq [user]
+      expect(resource.subscribers(project)).to contain_exactly(user_1, user_2)
     end
   end
 
   describe '#toggle_subscription' do
+    context 'without project' do
+      it 'toggles the current subscription state for the given user' do
+        expect(resource.subscribed?(user_1)).to be_falsey
+
+        resource.toggle_subscription(user_1)
+
+        expect(resource.subscribed?(user_1)).to be_truthy
+      end
+    end
+
+    context 'with project' do
       it 'toggles the current subscription state for the given user' do
-      expect(resource.subscribed?(user)).to be_falsey
+        expect(resource.subscribed?(user_1, project)).to be_falsey
 
-      resource.toggle_subscription(user)
+        resource.toggle_subscription(user_1, project)
 
-      expect(resource.subscribed?(user)).to be_truthy
+        expect(resource.subscribed?(user_1, project)).to be_truthy
+      end
     end
   end
 
   describe '#subscribe' do
+    context 'without project' do
       it 'subscribes the given user' do
-      expect(resource.subscribed?(user)).to be_falsey
+        expect(resource.subscribed?(user_1)).to be_falsey
 
-      resource.subscribe(user)
+        resource.subscribe(user_1)
 
-      expect(resource.subscribed?(user)).to be_truthy
+        expect(resource.subscribed?(user_1)).to be_truthy
+      end
+    end
+
+    context 'with project' do
+      it 'subscribes the given user' do
+        expect(resource.subscribed?(user_1, project)).to be_falsey
+
+        resource.subscribe(user_1, project)
+
+        expect(resource.subscribed?(user_1, project)).to be_truthy
+      end
     end
   end
 
   describe '#unsubscribe' do
+    context 'without project' do
+      it 'unsubscribes the given current user' do
+        resource.subscriptions.create(user: user_1, subscribed: true)
+        expect(resource.subscribed?(user_1)).to be_truthy
+
+        resource.unsubscribe(user_1)
+
+        expect(resource.subscribed?(user_1)).to be_falsey
+      end
+    end
+
+    context 'with project' do
       it 'unsubscribes the given current user' do
-      resource.subscriptions.create(user: user, subscribed: true)
-      expect(resource.subscribed?(user)).to be_truthy
+        resource.subscriptions.create(user: user_1, project: project, subscribed: true)
+        expect(resource.subscribed?(user_1, project)).to be_truthy
 
-      resource.unsubscribe(user)
+        resource.unsubscribe(user_1, project)
 
-      expect(resource.subscribed?(user)).to be_falsey
+        expect(resource.subscribed?(user_1, project)).to be_falsey
+      end
     end
   end
 end

spec/models/subscription_spec.rb

+require 'spec_helper'
+
+describe Subscription, models: true do
+  describe 'relationships' do
+    it { is_expected.to belong_to(:project) }
+    it { is_expected.to belong_to(:subscribable) }
+    it { is_expected.to belong_to(:user) }
+  end
+
+  describe 'validations' do
+    it { is_expected.to validate_presence_of(:subscribable) }
+    it { is_expected.to validate_presence_of(:user) }
+
+    it 'validates uniqueness of project_id scoped to subscribable_id, subscribable_type, and user_id' do
+      create(:subscription)
+
+      expect(subject).to validate_uniqueness_of(:project_id).scoped_to([:subscribable_id, :subscribable_type, :user_id])
+    end
+  end
+end

spec/requests/api/issues_spec.rb

@@ -637,7 +637,7 @@ describe API::API, api: true  do
 
     it "sends notifications for subscribers of newly added labels" do
       label = project.labels.first
-      label.toggle_subscription(user2)
+      label.toggle_subscription(user2, project)
 
       perform_enqueued_jobs do
         post api("/projects/#{project.id}/issues", user),
@@ -828,7 +828,7 @@ describe API::API, api: true  do
 
     it "sends notifications for subscribers of newly added labels when issue is updated" do
       label = create(:label, title: 'foo', color: '#FFAABB', project: project)
-      label.toggle_subscription(user2)
+      label.toggle_subscription(user2, project)
 
       perform_enqueued_jobs do
         put api("/projects/#{project.id}/issues/#{issue.id}", user),

spec/requests/api/labels_spec.rb

@@ -339,7 +339,7 @@ describe API::API, api: true  do
     end
 
     context "when user is already subscribed to label" do
-      before { label1.subscribe(user) }
+      before { label1.subscribe(user, project) }
 
       it "returns 304" do
         post api("/projects/#{project.id}/labels/#{label1.id}/subscription", user)
@@ -358,7 +358,7 @@ describe API::API, api: true  do
   end
 
   describe "DELETE /projects/:id/labels/:label_id/subscription" do
-    before { label1.subscribe(user) }
+    before { label1.subscribe(user, project) }
 
     context "when label_id is a label title" do
       it "unsubscribes from the label" do
@@ -381,7 +381,7 @@ describe API::API, api: true  do
     end
 
     context "when user is already unsubscribed from label" do
-      before { label1.unsubscribe(user) }
+      before { label1.unsubscribe(user, project) }
 
       it "returns 304" do
         delete api("/projects/#{project.id}/labels/#{label1.id}/subscription", user)

spec/services/issuable/bulk_update_service_spec.rb

@@ -260,14 +260,14 @@ describe Issuable::BulkUpdateService, services: true do
     it 'subscribes the given user' do
       bulk_update(issues, subscription_event: 'subscribe')
 
-      expect(issues).to all(be_subscribed(user))
+      expect(issues).to all(be_subscribed(user, project))
     end
   end
 
   describe 'unsubscribe from issues' do
     let(:issues) do
       create_list(:closed_issue, 2, project: project) do |issue|
-        issue.subscriptions.create(user: user, subscribed: true)
+        issue.subscriptions.create(user: user, project: project, subscribed: true)
       end
     end
 
@@ -275,7 +275,7 @@ describe Issuable::BulkUpdateService, services: true do
       bulk_update(issues, subscription_event: 'unsubscribe')
 
       issues.each do |issue|
-        expect(issue).not_to be_subscribed(user)
+        expect(issue).not_to be_subscribed(user, project)
       end
     end
   end

spec/services/issues/update_service_spec.rb

@@ -215,7 +215,7 @@ describe Issues::UpdateService, services: true do
 
       let!(:subscriber) do
         create(:user).tap do |u|
-          label.toggle_subscription(u)
+          label.toggle_subscription(u, project)
           project.team << [u, :developer]
         end
       end

spec/services/merge_requests/update_service_spec.rb

@@ -199,7 +199,7 @@ describe MergeRequests::UpdateService, services: true do
 
     context 'when the issue is relabeled' do
       let!(:non_subscriber) { create(:user) }
-      let!(:subscriber) { create(:user).tap { |u| label.toggle_subscription(u) } }
+      let!(:subscriber) { create(:user) { |u| label.toggle_subscription(u, project) } }
 
       before do
         project.team << [non_subscriber, :developer]

spec/services/slash_commands/interpret_service_spec.rb

@@ -169,7 +169,7 @@ describe SlashCommands::InterpretService, services: true do
 
     shared_examples 'unsubscribe command' do
       it 'populates subscription_event: "unsubscribe" if content contains /unsubscribe' do
-        issuable.subscribe(developer)
+        issuable.subscribe(developer, project)
         _, updates = service.execute(content, issuable)
 
         expect(updates).to eq(subscription_event: 'unsubscribe')

spec/support/features/issuable_slash_commands_shared_examples.rb

@@ -230,31 +230,31 @@ shared_examples 'issuable record that supports slash commands in its description
 
     context "with a note subscribing to the #{issuable_type}" do
       it "creates a new todo for the #{issuable_type}" do
-        expect(issuable.subscribed?(master)).to be_falsy
+        expect(issuable.subscribed?(master, project)).to be_falsy
 
         write_note("/subscribe")
 
         expect(page).not_to have_content '/subscribe'
         expect(page).to have_content 'Your commands have been executed!'
 
-        expect(issuable.subscribed?(master)).to be_truthy
+        expect(issuable.subscribed?(master, project)).to be_truthy
       end
     end
 
     context "with a note unsubscribing to the #{issuable_type} as done" do
       before do
-        issuable.subscribe(master)
+        issuable.subscribe(master, project)
       end
 
       it "creates a new todo for the #{issuable_type}" do
-        expect(issuable.subscribed?(master)).to be_truthy
+        expect(issuable.subscribed?(master, project)).to be_truthy
 
         write_note("/unsubscribe")
 
         expect(page).not_to have_content '/unsubscribe'
         expect(page).to have_content 'Your commands have been executed!'
 
-        expect(issuable.subscribed?(master)).to be_falsy
+        expect(issuable.subscribed?(master, project)).to be_falsy
       end
     end
   end