Milestone description: add autocomplete [RUN AS-IF-FOSS]

.rubocop_manual_todo.yml

@@ -1999,6 +1999,8 @@ Gitlab/NamespacedClass:
     - 'app/serializers/group_entity.rb'
     - 'app/serializers/group_group_link_entity.rb'
     - 'app/serializers/group_group_link_serializer.rb'
+    - 'app/serializers/group_issuable_autocomplete_entity.rb'
+    - 'app/serializers/group_issuable_autocomplete_serializer.rb'
     - 'app/serializers/group_serializer.rb'
     - 'app/serializers/issuable_entity.rb'
     - 'app/serializers/issuable_sidebar_basic_entity.rb'
@@ -2501,8 +2503,6 @@ Gitlab/NamespacedClass:
     - 'ee/app/serializers/geo_project_registry_entity.rb'
     - 'ee/app/serializers/geo_project_registry_serializer.rb'
     - 'ee/app/serializers/group_analytics_serializer.rb'
-    - 'ee/app/serializers/group_issuable_autocomplete_entity.rb'
-    - 'ee/app/serializers/group_issuable_autocomplete_serializer.rb'
     - 'ee/app/serializers/group_vulnerability_autocomplete_entity.rb'
     - 'ee/app/serializers/group_vulnerability_autocomplete_serializer.rb'
     - 'ee/app/serializers/invited_group_entity.rb'

app/assets/javascripts/pages/groups/milestones/edit/index.js

 import initForm from '../../../../shared/milestones/form';
 
-initForm(false);
+initForm();

app/assets/javascripts/pages/groups/milestones/new/index.js

 import initForm from '../../../../shared/milestones/form';
 
-initForm(false);
+initForm();

ee/app/controllers/groups/autocomplete_sources_controller.rb → app/controllers/groups/autocomplete_sources_controller.rb

 # frozen_string_literal: true
 
 class Groups::AutocompleteSourcesController < Groups::ApplicationController
-  before_action :load_autocomplete_service, except: [:members]
-
   feature_category :subgroups, [:members]
   feature_category :issue_tracking, [:issues, :labels, :milestones, :commands]
   feature_category :code_review, [:merge_requests]
-  feature_category :epics, [:epics]
-  feature_category :vulnerability_management, [:vulnerabilities]
 
   def members
     render json: ::Groups::ParticipantsService.new(@group, current_user).execute(target)
@@ -15,52 +11,37 @@ class Groups::AutocompleteSourcesController < Groups::ApplicationController
 
   def issues
     render json: issuable_serializer.represent(
-      @autocomplete_service.issues(confidential_only: params[:confidential_only], issue_types: params[:issue_types]),
+      autocomplete_service.issues(confidential_only: params[:confidential_only], issue_types: params[:issue_types]),
       parent_group: @group
     )
   end
 
   def merge_requests
-    render json: issuable_serializer.represent(@autocomplete_service.merge_requests, parent_group: @group)
+    render json: issuable_serializer.represent(autocomplete_service.merge_requests, parent_group: @group)
   end
 
   def labels
-    render json: @autocomplete_service.labels_as_hash(target)
-  end
-
-  def epics
-    render json: issuable_serializer.represent(
-      @autocomplete_service.epics(confidential_only: params[:confidential_only]),
-      parent_group: @group
-    )
-  end
-
-  def vulnerabilities
-    render json: vulnerability_serializer.represent(@autocomplete_service.vulnerabilities, parent_group: @group)
+    render json: autocomplete_service.labels_as_hash(target)
   end
 
   def commands
-    render json: @autocomplete_service.commands(target)
+    render json: autocomplete_service.commands(target)
   end
 
   def milestones
-    render json: @autocomplete_service.milestones
+    render json: autocomplete_service.milestones
   end
 
   private
 
-  def load_autocomplete_service
-    @autocomplete_service = ::Groups::AutocompleteService.new(@group, current_user, params)
+  def autocomplete_service
+    @autocomplete_service ||= ::Groups::AutocompleteService.new(@group, current_user, params)
   end
 
   def issuable_serializer
     GroupIssuableAutocompleteSerializer.new
   end
 
-  def vulnerability_serializer
-    GroupVulnerabilityAutocompleteSerializer.new
-  end
-
   # rubocop: disable CodeReuse/ActiveRecord
   def target
     QuickActions::TargetService
@@ -69,3 +50,5 @@ class Groups::AutocompleteSourcesController < Groups::ApplicationController
   end
   # rubocop: enable CodeReuse/ActiveRecord
 end
+
+Groups::AutocompleteSourcesController.prepend_if_ee('EE::Groups::AutocompleteSourcesController')

app/controllers/groups/milestones_controller.rb

@@ -21,7 +21,7 @@ class Groups::MilestonesController < Groups::ApplicationController
   end
 
   def new
-    @milestone = Milestone.new
+    @noteable = @milestone = Milestone.new
   end
 
   def create
@@ -70,7 +70,7 @@ class Groups::MilestonesController < Groups::ApplicationController
   end
 
   def milestone
-    @milestone = group.milestones.find_by_iid(params[:id])
+    @noteable = @milestone ||= group.milestones.find_by_iid(params[:id])
 
     render_404 unless @milestone
   end

app/controllers/projects/milestones_controller.rb

@@ -39,7 +39,7 @@ class Projects::MilestonesController < Projects::ApplicationController
   end
 
   def new
-    @milestone = @project.milestones.new
+    @noteable = @milestone = @project.milestones.new
     respond_with(@milestone)
   end
 
@@ -125,7 +125,7 @@ class Projects::MilestonesController < Projects::ApplicationController
 
   # rubocop: disable CodeReuse/ActiveRecord
   def milestone
-    @milestone ||= @project.milestones.find_by!(iid: params[:id])
+    @noteable = @milestone ||= @project.milestones.find_by!(iid: params[:id])
   end
   # rubocop: enable CodeReuse/ActiveRecord
 

app/helpers/application_helper.rb

@@ -382,6 +382,16 @@ module ApplicationHelper
   def autocomplete_data_sources(object, noteable_type)
     return {} unless object && noteable_type
 
+    if object.is_a?(Group)
+      {
+        members: members_group_autocomplete_sources_path(object, type: noteable_type, type_id: params[:id]),
+        issues: issues_group_autocomplete_sources_path(object),
+        mergeRequests: merge_requests_group_autocomplete_sources_path(object),
+        labels: labels_group_autocomplete_sources_path(object, type: noteable_type, type_id: params[:id]),
+        milestones: milestones_group_autocomplete_sources_path(object),
+        commands: commands_group_autocomplete_sources_path(object, type: noteable_type, type_id: params[:id])
+      }
+    else
       {
         members: members_project_autocomplete_sources_path(object, type: noteable_type, type_id: params[:id]),
         issues: issues_project_autocomplete_sources_path(object),
@@ -392,6 +402,7 @@ module ApplicationHelper
         snippets: snippets_project_autocomplete_sources_path(object)
       }
     end
+  end
 
   def asset_to_string(name)
     app = Rails.application

ee/app/services/groups/autocomplete_service.rb → app/services/groups/autocomplete_service.rb

@@ -26,24 +26,6 @@ module Groups
     end
     # rubocop: enable CodeReuse/ActiveRecord
 
-    def epics(confidential_only: false)
-      finder_params = { group_id: group.id }
-      finder_params[:confidential] = true if confidential_only.present?
-
-      # TODO: use include_descendant_groups: true optional parameter once frontend supports epics from external groups.
-      # See https://gitlab.com/gitlab-org/gitlab/issues/6837
-      EpicsFinder.new(current_user, finder_params)
-        .execute
-        .select(:iid, :title, :group_id)
-    end
-
-    def vulnerabilities
-      ::Autocomplete::VulnerabilitiesAutocompleteFinder
-        .new(current_user, group, params)
-        .execute
-        .select([:id, :title, :project_id])
-    end
-
     # rubocop: disable CodeReuse/ActiveRecord
     def milestones
       group_ids = group.self_and_ancestors.public_or_visible_to_user(current_user).pluck(:id)
@@ -63,3 +45,5 @@ module Groups
     end
   end
 end
+
+Groups::AutocompleteService.prepend_if_ee('EE::Groups::AutocompleteService')

app/views/groups/milestones/_form.html.haml

@@ -12,7 +12,11 @@
           = f.label :description, _("Description")
         .col-sm-10
           = render layout: 'shared/md_preview', locals: { url: group_preview_markdown_path } do
-            = render 'shared/zen', f: f, attr: :description, classes: 'note-textarea', qa_selector: 'milestone_description_field', placeholder: _('Write milestone description...'), supports_autocomplete: false
+            = render 'shared/zen', f: f, attr: :description,
+                                    classes: 'note-textarea',
+                                    qa_selector: 'milestone_description_field',
+                                    supports_autocomplete: true,
+                                    placeholder: _('Write milestone description...')
           .clearfix
           .error-alert
     = render "shared/milestones/form_dates", f: f

app/views/projects/milestones/_form.html.haml

@@ -13,7 +13,11 @@
           = f.label :description, _('Description')
         .col-sm-10
           = render layout: 'shared/md_preview', locals: { url: preview_markdown_path(@project) } do
-            = render 'shared/zen', f: f, attr: :description, classes: 'note-textarea', qa_selector: 'milestone_description_field', placeholder: _('Write milestone description...')
+            = render 'shared/zen', f: f, attr: :description,
+                                    classes: 'note-textarea',
+                                    qa_selector: 'milestone_description_field',
+                                    supports_autocomplete: true,
+                                    placeholder: _('Write milestone description...')
             = render 'shared/notes/hints'
           .clearfix
           .error-alert

changelogs/unreleased/feat-milestone-description-auto-complete.yml

+---
+title: Add autocomplete to milestone description
+merge_request: 59564
+author: Jonas Wälter @wwwjon
+type: added

config/routes/group.rb

@@ -114,6 +114,17 @@ constraints(::Constraints::GroupUrlConstrainer.new) do
     resources :container_registries, only: [:index, :show], controller: 'registry/repositories'
     resource :dependency_proxy, only: [:show, :update]
     resources :email_campaigns, only: :index
+
+    resources :autocomplete_sources, only: [] do
+      collection do
+        get 'members'
+        get 'issues'
+        get 'merge_requests'
+        get 'labels'
+        get 'commands'
+        get 'milestones'
+      end
+    end
   end
 
   scope(path: '*id',

ee/app/controllers/ee/groups/autocomplete_sources_controller.rb

+# frozen_string_literal: true
+
+module EE
+  module Groups
+    module AutocompleteSourcesController
+      extend ActiveSupport::Concern
+
+      prepended do
+        feature_category :epics, [:epics]
+        feature_category :vulnerability_management, [:vulnerabilities]
+      end
+
+      def epics
+        render json: issuable_serializer.represent(
+          autocomplete_service.epics(confidential_only: params[:confidential_only]),
+          parent_group: group
+        )
+      end
+
+      def vulnerabilities
+        render json: vulnerability_serializer.represent(autocomplete_service.vulnerabilities, parent_group: group)
+      end
+
+      private
+
+      def vulnerability_serializer
+        GroupVulnerabilityAutocompleteSerializer.new
+      end
+    end
+  end
+end

ee/app/helpers/ee/application_helper.rb

@@ -98,15 +98,9 @@ module EE
 
       if object.is_a?(Group)
         {
-          members: members_group_autocomplete_sources_path(object, type: noteable_type, type_id: params[:id]),
-          labels: labels_group_autocomplete_sources_path(object, type: noteable_type, type_id: params[:id]),
-          issues: issues_group_autocomplete_sources_path(object),
-          mergeRequests: merge_requests_group_autocomplete_sources_path(object),
           epics: epics_group_autocomplete_sources_path(object),
-          vulnerabilities: enabled_for_vulnerabilities ? vulnerabilities_group_autocomplete_sources_path(object) : nil,
-          commands: commands_group_autocomplete_sources_path(object, type: noteable_type, type_id: params[:id]),
-          milestones: milestones_group_autocomplete_sources_path(object)
-        }.compact
+          vulnerabilities: enabled_for_vulnerabilities ? vulnerabilities_group_autocomplete_sources_path(object) : nil
+        }.compact.merge(super)
       else
         {
           epics: object.group&.feature_available?(:epics) ? epics_project_autocomplete_sources_path(object) : nil,

ee/app/services/ee/groups/autocomplete_service.rb

+# frozen_string_literal: true
+module EE
+  module Groups
+    module AutocompleteService
+      def epics(confidential_only: false)
+        finder_params = { group_id: group.id }
+        finder_params[:confidential] = true if confidential_only.present?
+
+        # TODO: use include_descendant_groups: true optional parameter once frontend supports epics from external groups.
+        # See https://gitlab.com/gitlab-org/gitlab/issues/6837
+        EpicsFinder.new(current_user, finder_params)
+          .execute
+          .select(:iid, :title, :group_id)
+      end
+
+      def vulnerabilities
+        ::Autocomplete::VulnerabilitiesAutocompleteFinder
+          .new(current_user, group, params)
+          .execute
+          .select([:id, :title, :project_id])
+      end
+    end
+  end
+end

ee/config/routes/group.rb

@@ -90,14 +90,8 @@ constraints(::Constraints::GroupUrlConstrainer.new) do
 
     resources :autocomplete_sources, only: [] do
       collection do
-        get 'members'
-        get 'issues'
-        get 'merge_requests'
-        get 'labels'
         get 'epics'
         get 'vulnerabilities'
-        get 'commands'
-        get 'milestones'
       end
     end
 

ee/spec/controllers/groups/autocomplete_sources_controller_spec.rb → ee/spec/controllers/ee/groups/autocomplete_sources_controller_spec.rb

@@ -16,6 +16,35 @@ RSpec.describe Groups::AutocompleteSourcesController do
     sign_in(user)
   end
 
+  describe '#issues' do
+    using RSpec::Parameterized::TableSyntax
+
+    let_it_be(:project) { create(:project, group: group) }
+    let_it_be(:test_case) { create(:quality_test_case, project: project) }
+
+    where(:issue_types, :expected) do
+      nil         | :test_case
+      ''          | :test_case
+      'invalid'   | []
+      'test_case' | :test_case
+    end
+
+    with_them do
+      it 'returns the correct response', :aggregate_failures do
+        issues = Array(expected).flat_map { |sym| public_send(sym) }
+        params = { group_id: group, issue_types: issue_types }.compact
+
+        get :issues, params: params
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(json_response).to be_an(Array)
+        expect(json_response.size).to eq(issues.size)
+        expect(json_response.map { |issue| issue['iid'] })
+          .to match_array(issues.map(&:iid))
+      end
+    end
+  end
+
   describe '#epics' do
     it 'returns 200 status' do
       get :epics, params: { group_id: group }
@@ -58,61 +87,6 @@ RSpec.describe Groups::AutocompleteSourcesController do
     end
   end
 
-  describe '#issues' do
-    using RSpec::Parameterized::TableSyntax
-
-    let_it_be(:project) { create(:project, group: group) }
-    let_it_be(:issue) { create(:issue, project: project) }
-    let_it_be(:incident) { create(:incident, project: project) }
-    let_it_be(:test_case) { create(:quality_test_case, project: project) }
-
-    let(:none) { [] }
-    let(:all) { [issue, incident, test_case] }
-
-    where(:issue_types, :expected) do
-      nil         | :all
-      ''          | :all
-      'invalid'   | :none
-      'issue'     | :issue
-      'incident'  | :incident
-      'test_case' | :test_case
-    end
-
-    with_them do
-      it 'returns the correct response', :aggregate_failures do
-        issues = Array(expected).flat_map { |sym| public_send(sym) }
-        params = { group_id: group, issue_types: issue_types }.compact
-
-        get :issues, params: params
-
-        expect(response).to have_gitlab_http_status(:ok)
-        expect(json_response).to be_an(Array)
-        expect(json_response.size).to eq(issues.size)
-        expect(json_response.map { |issue| issue['iid'] })
-          .to match_array(issues.map(&:iid))
-      end
-    end
-  end
-
-  describe '#milestones' do
-    it 'returns correct response' do
-      parent_group = create(:group, :private)
-      group.update!(parent: parent_group)
-      sub_group = create(:group, :private, parent: sub_group)
-      create(:milestone, group: parent_group)
-      create(:milestone, group: sub_group)
-      group_milestone = create(:milestone, group: group)
-
-      get :milestones, params: { group_id: group }
-
-      expect(response).to have_gitlab_http_status(:ok)
-      expect(json_response.count).to eq(1)
-      expect(json_response.first).to include(
-        'iid' => group_milestone.iid, 'title' => group_milestone.title
-      )
-    end
-  end
-
   describe '#commands' do
     it 'returns 200 status' do
       get :commands, params: { group_id: group, type: 'Epic', type_id: epic.iid }

ee/spec/services/groups/autocomplete_service_spec.rb → ee/spec/services/ee/groups/autocomplete_service_spec.rb

@@ -26,14 +26,6 @@ RSpec.describe Groups::AutocompleteService do
     let!(:sub_group_label) { create(:group_label, group: sub_group) }
     let!(:parent_group_label) { create(:group_label, group: group.parent) }
 
-    it 'returns labels from own group and ancestor groups' do
-      results = subject.labels_as_hash(nil)
-
-      expected_labels = [label1, label2, parent_group_label]
-
-      expect_labels_to_equal(results, expected_labels)
-    end
-
     context 'some labels are already assigned' do
       before do
         epic.labels << label1
@@ -57,41 +49,6 @@ RSpec.describe Groups::AutocompleteService do
     end
   end
 
-  describe '#issues' do
-    let(:project) { create(:project, group: group) }
-    let(:sub_group_project) { create(:project, group: sub_group) }
-
-    let!(:project_issue) { create(:issue, project: project) }
-    let!(:sub_group_project_issue) { create(:issue, confidential: true, project: sub_group_project) }
-
-    it 'returns issues in group and subgroups' do
-      issues = subject.issues
-
-      expect(issues.map(&:iid)).to contain_exactly(project_issue.iid, sub_group_project_issue.iid)
-      expect(issues.map(&:title)).to contain_exactly(project_issue.title, sub_group_project_issue.title)
-    end
-
-    it 'returns only confidential issues if confidential_only is true' do
-      issues = subject.issues(confidential_only: true)
-
-      expect(issues.map(&:iid)).to contain_exactly(sub_group_project_issue.iid)
-      expect(issues.map(&:title)).to contain_exactly(sub_group_project_issue.title)
-    end
-  end
-
-  describe '#merge_requests' do
-    let(:project) { create(:project, :repository, group: group) }
-    let(:sub_group_project) { create(:project, :repository, group: sub_group) }
-
-    let!(:project_mr) { create(:merge_request, source_project: project) }
-    let!(:sub_group_project_mr) { create(:merge_request, source_project: sub_group_project) }
-
-    it 'returns merge requests in group and subgroups' do
-      expect(subject.merge_requests.map(&:iid)).to contain_exactly(project_mr.iid, sub_group_project_mr.iid)
-      expect(subject.merge_requests.map(&:title)).to contain_exactly(project_mr.title, sub_group_project_mr.title)
-    end
-  end
-
   describe '#epics' do
     let(:expected_attributes) { %i(iid title group_id) }
 
@@ -202,52 +159,4 @@ RSpec.describe Groups::AutocompleteService do
       end
     end
   end
-
-  describe '#milestones' do
-    let!(:group_milestone) { create(:milestone, group: group) }
-    let!(:subgroup_milestone) { create(:milestone, group: sub_group) }
-
-    before do
-      sub_group.add_maintainer(user)
-    end
-
-    context 'when group is public' do
-      let(:public_group) { create(:group, :public) }
-      let(:public_subgroup) { create(:group, :public, parent: public_group) }
-
-      before do
-        group_milestone.update(group: public_group)
-        subgroup_milestone.update(group: public_subgroup)
-      end
-
-      it 'returns milestones from groups and subgroups' do
-        subject = described_class.new(public_subgroup, user)
-
-        expect(subject.milestones.map(&:iid)).to contain_exactly(group_milestone.iid, subgroup_milestone.iid)
-        expect(subject.milestones.map(&:title)).to contain_exactly(group_milestone.title, subgroup_milestone.title)
-      end
-    end
-
-    it 'returns milestones from group' do
-      expect(subject.milestones.map(&:iid)).to contain_exactly(group_milestone.iid)
-      expect(subject.milestones.map(&:title)).to contain_exactly(group_milestone.title)
-    end
-
-    it 'returns milestones from groups and subgroups' do
-      milestones = described_class.new(sub_group, user).milestones
-
-      expect(milestones.map(&:iid)).to contain_exactly(group_milestone.iid, subgroup_milestone.iid)
-      expect(milestones.map(&:title)).to contain_exactly(group_milestone.title, subgroup_milestone.title)
-    end
-
-    it 'returns only milestones that user can read' do
-      user = create(:user)
-      sub_group.add_guest(user)
-
-      milestones = described_class.new(sub_group, user).milestones
-
-      expect(milestones.map(&:iid)).to contain_exactly(subgroup_milestone.iid)
-      expect(milestones.map(&:title)).to contain_exactly(subgroup_milestone.title)
-    end
-  end
 end

spec/controllers/groups/autocomplete_sources_controller_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Groups::AutocompleteSourcesController do
+  let_it_be(:user) { create(:user) }
+  let_it_be_with_reload(:group) { create(:group, :private) }
+
+  before_all do
+    group.add_developer(user)
+  end
+
+  before do
+    sign_in(user)
+  end
+
+  describe '#issues' do
+    using RSpec::Parameterized::TableSyntax
+
+    let_it_be(:project) { create(:project, group: group) }
+    let_it_be(:issue) { create(:issue, project: project) }
+    let_it_be(:incident) { create(:incident, project: project) }
+
+    let(:none) { [] }
+    let(:all) { [issue, incident] }
+
+    where(:issue_types, :expected) do
+      nil         | :all
+      ''          | :all
+      'invalid'   | :none
+      'issue'     | :issue
+      'incident'  | :incident
+    end
+
+    with_them do
+      it 'returns the correct response', :aggregate_failures do
+        issues = Array(expected).flat_map { |sym| public_send(sym) }
+        params = { group_id: group, issue_types: issue_types }.compact
+
+        get :issues, params: params
+
+        expect(response).to have_gitlab_http_status(:ok)
+        expect(json_response).to be_an(Array)
+        expect(json_response.size).to eq(issues.size)
+        expect(json_response.map { |issue| issue['iid'] })
+          .to match_array(issues.map(&:iid))
+      end
+    end
+  end
+
+  describe '#milestones' do
+    it 'returns correct response' do
+      parent_group = create(:group, :private)
+      group.update!(parent: parent_group)
+      sub_group = create(:group, :private, parent: sub_group)
+      create(:milestone, group: parent_group)
+      create(:milestone, group: sub_group)
+      group_milestone = create(:milestone, group: group)
+
+      get :milestones, params: { group_id: group }
+
+      expect(response).to have_gitlab_http_status(:ok)
+      expect(json_response.count).to eq(1)
+      expect(json_response.first).to include(
+        'iid' => group_milestone.iid, 'title' => group_milestone.title
+      )
+    end
+  end
+end

spec/features/groups/milestone_spec.rb

@@ -54,11 +54,11 @@ RSpec.describe 'Group milestones' do
       expect(find('.start_date')).to have_content(Date.today.at_beginning_of_month.strftime('%b %-d, %Y'))
     end
 
-    it 'description input does not support autocomplete' do
+    it 'description input support autocomplete' do
       description = find('.note-textarea')
       description.native.send_keys('!')
 
-      expect(page).not_to have_selector('.atwho-view')
+      expect(page).to have_selector('.atwho-view')
     end
   end
 

spec/features/groups/milestones/gfm_autocomplete_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'GFM autocomplete', :js do
+  let_it_be(:user) { create(:user, name: '💃speciąl someone💃', username: 'someone.special') }
+  let_it_be(:group) { create(:group, name: 'Ancestor') }
+  let_it_be(:project) { create(:project, :repository, group: group) }
+  let_it_be(:issue) { create(:issue, project: project, assignees: [user], title: 'My special issue') }
+  let_it_be(:label) { create(:group_label, group: group, title: 'special+') }
+  let_it_be(:milestone) { create(:milestone, resource_parent: group, title: "group milestone") }
+  let_it_be(:merge_request) { create(:merge_request, source_project: project) }
+
+  shared_examples 'displays autocomplete menu for all entities' do
+    it 'autocompletes all available entities' do
+      fill_in 'Description', with: User.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(group.name)
+
+      fill_in 'Description', with: Label.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(label.title)
+
+      fill_in 'Description', with: Milestone.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(milestone.title)
+
+      fill_in 'Description', with: Issue.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(issue.title)
+
+      fill_in 'Description', with: MergeRequest.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(merge_request.title)
+    end
+  end
+
+  before_all do
+    group.add_maintainer(user)
+  end
+
+  describe 'new milestone page' do
+    before do
+      sign_in(user)
+      visit new_group_milestone_path(group)
+
+      wait_for_requests
+    end
+
+    it_behaves_like 'displays autocomplete menu for all entities'
+  end
+
+  describe 'update milestone page' do
+    before do
+      sign_in(user)
+      visit edit_group_milestone_path(group, milestone)
+
+      wait_for_requests
+    end
+
+    it_behaves_like 'displays autocomplete menu for all entities'
+  end
+
+  private
+
+  def find_autocomplete_menu
+    find('.atwho-view ul', visible: true)
+  end
+
+  def expect_autocomplete_entry(entry)
+    page.within('.atwho-container') do
+      expect(page).to have_content(entry)
+    end
+  end
+end

spec/features/projects/milestones/gfm_autocomplete_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe 'GFM autocomplete', :js do
+  let_it_be(:user) { create(:user, name: '💃speciąl someone💃', username: 'someone.special') }
+  let_it_be(:group) { create(:group, name: 'Ancestor') }
+  let_it_be(:project) { create(:project, :repository, group: group) }
+  let_it_be(:issue) { create(:issue, project: project, assignees: [user], title: 'My special issue') }
+  let_it_be(:label) { create(:label, project: project, title: 'special+') }
+  let_it_be(:milestone) { create(:milestone, resource_parent: project, title: "project milestone") }
+  let_it_be(:merge_request) { create(:merge_request, source_project: project) }
+
+  shared_examples 'displays autocomplete menu for all entities' do
+    it 'autocompletes all available entities' do
+      fill_in 'Description', with: User.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(user.name)
+
+      fill_in 'Description', with: Label.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(label.title)
+
+      fill_in 'Description', with: Milestone.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(milestone.title)
+
+      fill_in 'Description', with: Issue.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(issue.title)
+
+      fill_in 'Description', with: MergeRequest.reference_prefix
+      wait_for_requests
+      expect(find_autocomplete_menu).to be_visible
+      expect_autocomplete_entry(merge_request.title)
+    end
+  end
+
+  before_all do
+    group.add_maintainer(user)
+  end
+
+  describe 'new milestone page' do
+    before do
+      sign_in(user)
+      visit new_project_milestone_path(project)
+
+      wait_for_requests
+    end
+
+    it_behaves_like 'displays autocomplete menu for all entities'
+  end
+
+  describe 'update milestone page' do
+    before do
+      sign_in(user)
+      visit edit_project_milestone_path(project, milestone)
+
+      wait_for_requests
+    end
+
+    it_behaves_like 'displays autocomplete menu for all entities'
+  end
+
+  private
+
+  def find_autocomplete_menu
+    find('.atwho-view ul', visible: true)
+  end
+
+  def expect_autocomplete_entry(entry)
+    page.within('.atwho-container') do
+      expect(page).to have_content(entry)
+    end
+  end
+end

spec/helpers/application_helper_spec.rb

@@ -284,6 +284,20 @@ RSpec.describe ApplicationHelper do
   end
 
   describe '#autocomplete_data_sources' do
+    context 'group' do
+      let(:group) { create(:group) }
+      let(:noteable_type) { Issue }
+
+      it 'returns paths for autocomplete_sources_controller' do
+        sources = helper.autocomplete_data_sources(group, noteable_type)
+        expect(sources.keys).to include(:members, :issues, :mergeRequests, :labels, :milestones, :commands)
+        sources.keys.each do |key|
+          expect(sources[key]).not_to be_nil
+        end
+      end
+    end
+
+    context 'project' do
       let(:project) { create(:project) }
       let(:noteable_type) { Issue }
 
@@ -295,6 +309,7 @@ RSpec.describe ApplicationHelper do
         end
       end
     end
+  end
 
   describe '#external_storage_url_or_path' do
     let(:project) { create(:project) }

spec/services/groups/autocomplete_service_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+RSpec.describe Groups::AutocompleteService do
+  let_it_be(:group, refind: true) { create(:group, :nested, :private, avatar: fixture_file_upload('spec/fixtures/dk.png')) }
+  let_it_be(:sub_group) { create(:group, :private, parent: group) }
+
+  let(:user) { create(:user) }
+
+  subject { described_class.new(group, user) }
+
+  before do
+    group.add_developer(user)
+  end
+
+  def expect_labels_to_equal(labels, expected_labels)
+    extract_title = lambda { |label| label['title'] }
+    expect(labels.map(&extract_title)).to match_array(expected_labels.map(&extract_title))
+  end
+
+  describe '#labels_as_hash' do
+    let!(:label1) { create(:group_label, group: group) }
+    let!(:label2) { create(:group_label, group: group) }
+    let!(:sub_group_label) { create(:group_label, group: sub_group) }
+    let!(:parent_group_label) { create(:group_label, group: group.parent) }
+
+    it 'returns labels from own group and ancestor groups' do
+      results = subject.labels_as_hash(nil)
+
+      expected_labels = [label1, label2, parent_group_label]
+
+      expect_labels_to_equal(results, expected_labels)
+    end
+  end
+
+  describe '#issues' do
+    let(:project) { create(:project, group: group) }
+    let(:sub_group_project) { create(:project, group: sub_group) }
+
+    let!(:project_issue) { create(:issue, project: project) }
+    let!(:sub_group_project_issue) { create(:issue, confidential: true, project: sub_group_project) }
+
+    it 'returns issues in group and subgroups' do
+      issues = subject.issues
+
+      expect(issues.map(&:iid)).to contain_exactly(project_issue.iid, sub_group_project_issue.iid)
+      expect(issues.map(&:title)).to contain_exactly(project_issue.title, sub_group_project_issue.title)
+    end
+
+    it 'returns only confidential issues if confidential_only is true' do
+      issues = subject.issues(confidential_only: true)
+
+      expect(issues.map(&:iid)).to contain_exactly(sub_group_project_issue.iid)
+      expect(issues.map(&:title)).to contain_exactly(sub_group_project_issue.title)
+    end
+  end
+
+  describe '#merge_requests' do
+    let(:project) { create(:project, :repository, group: group) }
+    let(:sub_group_project) { create(:project, :repository, group: sub_group) }
+
+    let!(:project_mr) { create(:merge_request, source_project: project) }
+    let!(:sub_group_project_mr) { create(:merge_request, source_project: sub_group_project) }
+
+    it 'returns merge requests in group and subgroups' do
+      expect(subject.merge_requests.map(&:iid)).to contain_exactly(project_mr.iid, sub_group_project_mr.iid)
+      expect(subject.merge_requests.map(&:title)).to contain_exactly(project_mr.title, sub_group_project_mr.title)
+    end
+  end
+
+  describe '#milestones' do
+    let!(:group_milestone) { create(:milestone, group: group) }
+    let!(:subgroup_milestone) { create(:milestone, group: sub_group) }
+
+    before do
+      sub_group.add_maintainer(user)
+    end
+
+    context 'when group is public' do
+      let(:public_group) { create(:group, :public) }
+      let(:public_subgroup) { create(:group, :public, parent: public_group) }
+
+      before do
+        group_milestone.update!(group: public_group)
+        subgroup_milestone.update!(group: public_subgroup)
+      end
+
+      it 'returns milestones from groups and subgroups' do
+        subject = described_class.new(public_subgroup, user)
+
+        expect(subject.milestones.map(&:iid)).to contain_exactly(group_milestone.iid, subgroup_milestone.iid)
+        expect(subject.milestones.map(&:title)).to contain_exactly(group_milestone.title, subgroup_milestone.title)
+      end
+    end
+
+    it 'returns milestones from group' do
+      expect(subject.milestones.map(&:iid)).to contain_exactly(group_milestone.iid)
+      expect(subject.milestones.map(&:title)).to contain_exactly(group_milestone.title)
+    end
+
+    it 'returns milestones from groups and subgroups' do
+      milestones = described_class.new(sub_group, user).milestones
+
+      expect(milestones.map(&:iid)).to contain_exactly(group_milestone.iid, subgroup_milestone.iid)
+      expect(milestones.map(&:title)).to contain_exactly(group_milestone.title, subgroup_milestone.title)
+    end
+
+    it 'returns only milestones that user can read' do
+      user = create(:user)
+      sub_group.add_guest(user)
+
+      milestones = described_class.new(sub_group, user).milestones
+
+      expect(milestones.map(&:iid)).to contain_exactly(subgroup_milestone.iid)
+      expect(milestones.map(&:title)).to contain_exactly(subgroup_milestone.title)
+    end
+  end
+end