Remove epic field for projects not in groups

Also fixes epics field being shown in MRs

app/models/concerns/issuable.rb

@@ -373,7 +373,5 @@ module Issuable
   end
 end
 
-# We have to prepend into Issuable::ClassMethods, as otherwise the methods
-# defined in EE::Issuable will available on Issuable, and not
-# Issuable::ClassMethods (= what in turn is exposed to classes).
-Issuable::ClassMethods.prepend(EE::Issuable)
+Issuable.prepend(EE::Issuable) # rubocop: disable Cop/InjectEnterpriseEditionModule
+Issuable::ClassMethods.prepend(EE::Issuable::ClassMethods)

ee/app/helpers/license_helper.rb

@@ -110,9 +110,5 @@ module LicenseHelper
     !Gitlab::CurrentSettings.should_check_namespace_plan? && show_promotions? && show_callout?('promote_advanced_search_dismissed') && !License.feature_available?(:elastic_search)
   end
 
-  def promote_feature?(feature_name)
-    !@project&.group&.feature_available?(feature_name) && show_promotions? && show_callout?(feature_name)
-  end
-
   extend self
 end

ee/app/models/concerns/ee/issuable.rb

@@ -4,15 +4,21 @@ module EE
   module Issuable
     extend ActiveSupport::Concern
 
-    def labels_hash
-      issue_labels = Hash.new { |h, k| h[k] = [] }
+    class_methods do
+      def labels_hash
+        issue_labels = Hash.new { |h, k| h[k] = [] }
 
-      relation = unscoped.where(id: self.select(:id)).eager_load(:labels)
-      relation.pluck(:id, 'labels.title').each do |issue_id, label|
-        issue_labels[issue_id] << label
+        relation = unscoped.where(id: self.select(:id)).eager_load(:labels)
+        relation.pluck(:id, 'labels.title').each do |issue_id, label|
+          issue_labels[issue_id] << label
+        end
+
+        issue_labels
       end
+    end
 
-      issue_labels
+    def supports_epic?
+      is_a?(Issue) && project.group
     end
   end
 end

ee/app/views/shared/issuable/_sidebar_item_epic.haml

-- if issuable.project.feature_available?(:epics)
-  - if issuable.is_a?(Issue)
+- if issuable.supports_epic?
+  - if issuable.project.group.feature_available?(:epics)
     .block.epic
       #js-vue-sidebar-item-epic
         .title.hide-collapsed
           Epic
           = icon('spinner spin')
-- else
-  = render 'shared/promotions/promote_epics'
+  - else
+    = render 'shared/promotions/promote_epics'

ee/app/views/shared/promotions/_promote_epics.html.haml

 - promotion_feature = 'promote_epics_sidebar_dismissed'
 
-- if promote_feature?(:epic) && show_promotions? && show_callout?(promotion_feature)
+- if show_promotions? && show_callout?(promotion_feature)
   .block.js-epics-sidebar-callout.promotion-issue-sidebar{ data: { uid: promotion_feature } }
     .sidebar-collapsed-icon{ data: { toggle: "dropdown", target: ".js-epics-sidebar-callout" } }
       %span{ data: { toggle: "tooltip", placement: "left", container: "body" }, title: _('Epic') }

ee/changelogs/unreleased/7866-fix-epics-promotion-helper.yml

+---
+title: Remove epic field in sidebar for projects without groups
+merge_request: 8919
+author:
+type: fixed

ee/spec/features/issues/epic_in_issue_sidebar_spec.rb

@@ -8,27 +8,66 @@ describe 'Epic in issue sidebar', :js do
   let(:issue) { create(:issue, project: project) }
   let!(:epic_issue) { create(:epic_issue, epic: epic, issue: issue) }
 
+  shared_examples 'epic in issue sidebar' do
+    it 'shows epic in issue sidebar for projects with group' do
+      visit project_issue_path(project, issue)
+
+      expect(page.find('.block.epic .value')).to have_content(epic.title)
+    end
+
+    it 'does not show epic in issue sidebar for personal projects' do
+      personal_project = create(:project, :public)
+      other_issue = create(:issue, project: personal_project)
+
+      visit project_issue_path(personal_project, other_issue)
+
+      expect_no_epic
+    end
+  end
+
   context 'when epics available' do
     before do
       stub_licensed_features(epics: true)
-      sign_in(user)
-      visit project_issue_path(project, issue)
     end
 
-    it 'shows epic in issue sidebar' do
-      expect(page.find('.block.epic .value')).to have_content(epic.title)
+    it_behaves_like 'epic in issue sidebar'
+
+    context 'with namespaced plans' do
+      before do
+        stub_application_setting(check_namespace_plan: true)
+      end
+
+      context 'group has license' do
+        before do
+          create(:gitlab_subscription, :gold, namespace: group)
+        end
+
+        it_behaves_like 'epic in issue sidebar'
+      end
+
+      context 'group has no license' do
+        it 'does not show epic for public projects and groups' do
+          visit project_issue_path(project, issue)
+
+          expect_no_epic
+        end
+      end
     end
   end
 
   context 'when epics unavailable' do
     before do
       stub_licensed_features(epics: false)
-      sign_in(user)
-      visit project_issue_path(project, issue)
     end
 
     it 'does not show epic in issue sidebar' do
-      expect(page).not_to have_selector('.block.epic')
+      visit project_issue_path(project, issue)
+
+      expect_no_epic
     end
   end
+
+  def expect_no_epic
+    expect(page).not_to have_selector('.block.epic')
+  end
 end

ee/spec/features/merge_request/sidebar_spec.rb

+# frozen_string_literal: true
+
+require 'spec_helper'
+
+describe 'Merge Request sidebar' do
+  let(:user) { create(:user) }
+  let(:group) { create(:group, :public) }
+  let(:project) { create(:project, :repository, :public, group: group) }
+  let(:merge_request) { create(:merge_request, source_project: project, target_project: project) }
+
+  context 'when epics available' do
+    before do
+      stub_licensed_features(epics: true)
+    end
+
+    it 'does not show epics in MR sidebar' do
+      visit project_merge_request_path(project, merge_request)
+
+      expect(page).not_to have_selector('.block.epic')
+    end
+  end
+
+  context 'when epics unavailable' do
+    before do
+      stub_licensed_features(epics: false)
+    end
+
+    it 'does not show epics promotion in MR sidebar' do
+      visit project_merge_request_path(project, merge_request)
+
+      expect(page).not_to have_selector('.js-epics-sidebar-callout')
+    end
+  end
+end