Add relationship and link to new epic to promoted issues

Closes #9898

app/helpers/issues_helper.rb

@@ -183,4 +183,4 @@ module IssuesHelper
   module_function :url_for_tracker_issue
 end
 
-IssuesHelper.include_if_ee('EE::IssuesHelper')
+IssuesHelper.prepend_if_ee('EE::IssuesHelper')

db/migrate/20191026120008_add_promoted_to_epic_to_issues.rb

+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddPromotedToEpicToIssues < ActiveRecord::Migration[5.2]
+  DOWNTIME = false
+
+  def up
+    add_column :issues, :promoted_to_epic_id, :integer
+  end
+
+  def down
+    remove_column :issues, :promoted_to_epic_id
+  end
+end

db/migrate/20191026120112_add_promoted_to_epic_to_issues_index.rb

+# frozen_string_literal: true
+
+# See http://doc.gitlab.com/ce/development/migration_style_guide.html
+# for more information on how to write migrations for GitLab.
+
+class AddPromotedToEpicToIssuesIndex < ActiveRecord::Migration[5.2]
+  include Gitlab::Database::MigrationHelpers
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    add_concurrent_foreign_key :issues, :epics, column: :promoted_to_epic_id, on_delete: :nullify
+    add_concurrent_index :issues, :promoted_to_epic_id, where: 'promoted_to_epic_id IS NOT NULL'
+  end
+
+  def down
+    remove_concurrent_index(:issues, :promoted_to_epic_id)
+    remove_foreign_key :issues, column: :promoted_to_epic_id
+  end
+end

db/schema.rb

@@ -2049,6 +2049,7 @@ ActiveRecord::Schema.define(version: 2019_11_18_182722) do
     t.integer "closed_by_id"
     t.integer "state_id", limit: 2, default: 1, null: false
     t.integer "duplicated_to_id"
+    t.integer "promoted_to_epic_id"
     t.index ["author_id"], name: "index_issues_on_author_id"
     t.index ["closed_by_id"], name: "index_issues_on_closed_by_id"
     t.index ["confidential"], name: "index_issues_on_confidential"
@@ -2065,6 +2066,7 @@ ActiveRecord::Schema.define(version: 2019_11_18_182722) do
     t.index ["project_id", "relative_position", "state_id", "id"], name: "idx_issues_on_project_id_and_rel_position_and_state_id_and_id", order: { id: :desc }
     t.index ["project_id", "updated_at", "id", "state"], name: "index_issues_on_project_id_and_updated_at_and_id_and_state"
     t.index ["project_id", "updated_at", "id", "state_id"], name: "idx_issues_on_project_id_and_updated_at_and_id_and_state_id"
+    t.index ["promoted_to_epic_id"], name: "index_issues_on_promoted_to_epic_id", where: "(promoted_to_epic_id IS NOT NULL)"
     t.index ["relative_position"], name: "index_issues_on_relative_position"
     t.index ["state"], name: "index_issues_on_state"
     t.index ["state_id"], name: "idx_issues_on_state_id"
@@ -4428,6 +4430,7 @@ ActiveRecord::Schema.define(version: 2019_11_18_182722) do
   add_foreign_key "issue_tracker_data", "services", on_delete: :cascade
   add_foreign_key "issue_user_mentions", "issues", on_delete: :cascade
   add_foreign_key "issue_user_mentions", "notes", on_delete: :cascade
+  add_foreign_key "issues", "epics", column: "promoted_to_epic_id", name: "fk_df75a7c8b8", on_delete: :nullify
   add_foreign_key "issues", "issues", column: "duplicated_to_id", name: "fk_9c4516d665", on_delete: :nullify
   add_foreign_key "issues", "issues", column: "moved_to_id", name: "fk_a194299be1", on_delete: :nullify
   add_foreign_key "issues", "milestones", name: "fk_96b1dd429c", on_delete: :nullify

ee/app/helpers/ee/issues_helper.rb

@@ -2,6 +2,8 @@
 
 module EE
   module IssuesHelper
+    extend ::Gitlab::Utils::Override
+
     def weight_dropdown_tag(issuable, opts = {}, &block)
       title = issuable.weight || 'Weight'
       additional_toggle_class = opts.delete(:toggle_class)
@@ -28,5 +30,14 @@ module EE
         h(weight.presence || 'Weight')
       end
     end
+
+    override :issue_closed_link
+    def issue_closed_link(issue, current_user, css_class: '')
+      if issue.promoted? && can?(current_user, :read_epic, issue.promoted_to_epic)
+        link_to(s_('IssuableStatus|promoted'), issue.promoted_to_epic, class: css_class)
+      else
+        super
+      end
+    end
   end
 end

ee/app/models/ee/issue.rb

@@ -26,6 +26,7 @@ module EE
 
       has_one :epic_issue
       has_one :epic, through: :epic_issue
+      belongs_to :promoted_to_epic, class_name: 'Epic'
       has_many :designs, class_name: "DesignManagement::Design", inverse_of: :issue
       has_many :design_versions, class_name: "DesignManagement::Version", inverse_of: :issue do
         def most_recent
@@ -124,6 +125,10 @@ module EE
       @design_collection ||= ::DesignManagement::DesignCollection.new(self)
     end
 
+    def promoted?
+      !!promoted_to_epic_id
+    end
+
     class_methods do
       # override
       def sort_by_attribute(method, excluded_labels: [])

ee/app/services/epics/issue_promote_service.rb

@@ -33,6 +33,16 @@ module Epics
       @new_entity = Epics::CreateService.new(@group, current_user, params).execute
     end
 
+    def update_old_entity
+      super
+
+      mark_as_promoted
+    end
+
+    def mark_as_promoted
+      original_entity.update(promoted_to_epic: new_entity)
+    end
+
     def params
       {
         title: original_entity.title

ee/changelogs/unreleased/9898-issue-epic-indication.yml

+---
+title: Add link to new epic for promoted issues
+merge_request: 18839
+author: Jan Beckmann
+type: added

ee/spec/helpers/ee/issues_helper_spec.rb

+# frozen_string_literal: true
+
+require "spec_helper"
+
+describe IssuesHelper do
+  let(:project) { create(:project) }
+  let(:issue) { create :issue, project: project }
+
+  describe '#issue_closed_link' do
+    let(:new_epic) { create(:epic) }
+    let(:user)     { create(:user) }
+
+    context 'with linked issue' do
+      context 'with promoted issue' do
+        before do
+          issue.update(promoted_to_epic: new_epic)
+        end
+
+        context 'when user has permission to see new epic' do
+          before do
+            expect(helper).to receive(:can?).with(user, :read_epic, new_epic) { true }
+          end
+
+          let(:css_class) { 'text-white text-underline' }
+
+          it 'returns link' do
+            link = "<a class=\"#{css_class}\" href=\"/groups/#{new_epic.group.full_path}/-/epics/#{new_epic.iid}\">(promoted)</a>"
+
+            expect(helper.issue_closed_link(issue, user, css_class: css_class)).to match(link)
+          end
+        end
+
+        context 'when user has no permission to see new epic' do
+          before do
+            expect(helper).to receive(:can?).with(user, :read_epic, new_epic) { false }
+          end
+
+          it 'returns nil' do
+            expect(helper.issue_closed_link(issue, user)).to be_nil
+          end
+        end
+      end
+    end
+  end
+end

ee/spec/models/issue_spec.rb

@@ -115,6 +115,7 @@ describe Issue do
     it { is_expected.to have_many(:prometheus_alerts) }
     it { is_expected.to have_many(:vulnerability_links).class_name('Vulnerabilities::IssueLink').inverse_of(:issue) }
     it { is_expected.to have_many(:related_vulnerabilities).through(:vulnerability_links).source(:vulnerability) }
+    it { is_expected.to belong_to(:promoted_to_epic).class_name('Epic') }
 
     describe 'versions.most_recent' do
       it 'returns the most recent version' do
@@ -256,6 +257,22 @@ describe Issue do
     end
   end
 
+  describe '#promoted?' do
+    let(:issue) { create(:issue) }
+    subject { issue.promoted? }
+
+    context 'issue not promoted' do
+      it { is_expected.to be_falsey }
+    end
+
+    context 'issue promoted' do
+      let(:promoted_to_epic) { create(:epic) }
+      let(:issue) { create(:issue, promoted_to_epic: promoted_to_epic) }
+
+      it { is_expected.to be_truthy }
+    end
+  end
+
   describe 'relative positioning with group boards' do
     let(:group) { create(:group) }
     let!(:board) { create(:board, group: group) }

ee/spec/services/epics/issue_promote_service_spec.rb

@@ -83,6 +83,11 @@ describe Epics::IssuePromoteService do
           it 'closes the original issue' do
             expect(issue).to be_closed
           end
+
+          it 'marks the old issue as promoted' do
+            expect(issue).to be_promoted
+            expect(issue.promoted_to_epic).to eq(epic)
+          end
         end
 
         context 'when promoted issue has notes' do

locale/gitlab.pot

@@ -9565,6 +9565,9 @@ msgstr ""
 msgid "IssuableStatus|moved"
 msgstr ""
 
+msgid "IssuableStatus|promoted"
+msgstr ""
+
 msgid "Issue"
 msgstr ""
 

spec/lib/gitlab/import_export/all_models.yml

@@ -15,6 +15,7 @@ issues:
 - user_agent_detail
 - moved_to
 - duplicated_to
+- promoted_to_epic
 - events
 - merge_requests_closing_issues
 - metrics

spec/lib/gitlab/import_export/safe_model_attributes.yml

@@ -20,6 +20,7 @@ Issue:
 - due_date
 - moved_to_id
 - duplicated_to_id
+- promoted_to_epic_id
 - lock_version
 - milestone_id
 - weight