Copy contacts when moving an issue

Changelog: added

app/services/issues/move_service.rb

@@ -2,6 +2,8 @@
 
 module Issues
   class MoveService < Issuable::Clone::BaseService
+    extend ::Gitlab::Utils::Override
+
     MoveError = Class.new(StandardError)
 
     def execute(issue, target_project)
@@ -47,6 +49,7 @@ module Issues
         .sent_notifications.update_all(project_id: new_entity.project_id, noteable_id: new_entity.id)
     end
 
+    override :update_old_entity
     def update_old_entity
       super
 
@@ -54,6 +57,13 @@ module Issues
       mark_as_moved
     end
 
+    override :update_new_entity
+    def update_new_entity
+      super
+
+      copy_contacts
+    end
+
     def create_new_entity
       new_params = {
         id: nil,
@@ -99,6 +109,13 @@ module Issues
       target_issue_links.update_all(target_id: new_entity.id)
     end
 
+    def copy_contacts
+      return unless Feature.enabled?(:customer_relations, original_entity.project.root_ancestor)
+      return unless original_entity.project.root_ancestor == new_entity.project.root_ancestor
+
+      new_entity.customer_relations_contacts = original_entity.customer_relations_contacts
+    end
+
     def notify_participants
       notification_service.async.issue_moved(original_entity, new_entity, @current_user)
     end

spec/services/issues/move_service_spec.rb

@@ -168,6 +168,48 @@ RSpec.describe Issues::MoveService do
         end
       end
 
+      context 'issue with contacts' do
+        let_it_be(:contacts) { create_list(:contact, 2, group: group) }
+
+        before do
+          old_issue.customer_relations_contacts = contacts
+        end
+
+        it 'preserves contacts' do
+          new_issue = move_service.execute(old_issue, new_project)
+
+          expect(new_issue.customer_relations_contacts).to eq(contacts)
+        end
+
+        context 'when moving to another root group' do
+          let(:another_project) { create(:project, namespace: create(:group)) }
+
+          before do
+            another_project.add_reporter(user)
+          end
+
+          it 'does not preserve contacts' do
+            new_issue = move_service.execute(old_issue, another_project)
+
+            expect(new_issue.customer_relations_contacts).to be_empty
+          end
+        end
+
+        context 'when customer_relations feature is disabled' do
+          let(:another_project) { create(:project, namespace: create(:group)) }
+
+          before do
+            stub_feature_flags(customer_relations: false)
+          end
+
+          it 'does not preserve contacts' do
+            new_issue = move_service.execute(old_issue, new_project)
+
+            expect(new_issue.customer_relations_contacts).to be_empty
+          end
+        end
+      end
+
       context 'moving to same project' do
         let(:new_project) { old_project }