Allow to assign labels and milestone to target project when moving issue

app/services/issues/move_service.rb

@@ -41,7 +41,8 @@ module Issues
     private
 
     def create_new_issue
-      new_params = { id: nil, iid: nil, label_ids: [], milestone: nil,
+      new_params = { id: nil, iid: nil, label_ids: cloneable_label_ids,
+                     milestone: cloneable_milestone_id,
                      project: @new_project, author: @old_issue.author,
                      description: rewrite_content(@old_issue.description) }
 
@@ -49,6 +50,14 @@ module Issues
       CreateService.new(@new_project, @current_user, new_params).execute
     end
 
+    def cloneable_label_ids
+      @new_project.labels.where(title: @old_issue.labels.pluck(:title)).pluck(:id)
+    end
+
+    def cloneable_milestone_id
+      @new_project.milestones.find_by(title: @old_issue.milestone.try(:title))
+    end
+
     def rewrite_notes
       @old_issue.notes.find_each do |note|
         new_note = note.dup

spec/services/issues/move_service_spec.rb

@@ -21,6 +21,15 @@ describe Issues::MoveService, services: true do
     before do
       old_project.team << [user, :reporter]
       new_project.team << [user, :reporter]
+
+      create(:milestone, project_id: old_project.id, title: 'v1.0')
+      create(:milestone, project_id: new_project.id, title: 'v1.0')
+
+      old_issue.labels << create(:label, project_id: old_project.id, title: 'label1')
+      old_issue.labels << create(:label, project_id: old_project.id, title: 'label2')
+
+      new_project.labels << create(:label, title: 'label1')
+      new_project.labels << create(:label, title: 'label2')
     end
   end
 
@@ -39,6 +48,17 @@ describe Issues::MoveService, services: true do
           expect(new_issue.project).to eq new_project
         end
 
+        it 'assigns milestone to new issue' do
+          expect(new_issue.reload.milestone.title).to eq 'v1.0'
+        end
+
+        it 'assign labels to new issue' do
+          expected_label_titles = new_issue.reload.labels.map(&:title)
+          expect(expected_label_titles).to include 'label1'
+          expect(expected_label_titles).to include 'label2'
+          expect(expected_label_titles.size).to eq 2
+        end
+
         it 'rewrites issue title' do
           expect(new_issue.title).to eq title
         end