Make /copy_metadata only handle the first issuable passed

app/services/quick_actions/interpret_service.rb

@@ -269,21 +269,21 @@ module QuickActions
     end
 
     desc 'Copy labels and milestone from other issue or merge request'
-    explanation do |issuable_id|
-      "Copy labels and milestone from issue or merge_request #{issuable_id}."
+    explanation do |source_issuable|
+      "Copy labels and milestone from #{source_issuable.to_reference}."
     end
     params '#issue | !merge_request'
     condition do
       issuable.persisted? &&
         current_user.can?(:"update_#{issuable.to_ability_name}", issuable)
     end
-    command :copy_metadata do |issuable_id|
-      source_issuable = extract_references(issuable_id, :issue).first
-      source_issuable ||= extract_references(issuable_id, :merge_request).first
-
+    parse_params do |issuable_param|
+      extract_references(issuable_param, :issue).first ||
+        extract_references(issuable_param, :merge_request).first
+    end
+    command :copy_metadata do |source_issuable|
       if source_issuable.present? && source_issuable.project.id == issuable.project.id
         @updates[:add_label_ids] = source_issuable.labels.map(&:id)
-
         @updates[:milestone_id] = source_issuable.milestone.id if source_issuable.milestone
       end
     end

doc/user/project/quick_actions.md

@@ -38,7 +38,7 @@ do.
 | `/award :emoji:`  | Toggle award for :emoji: |
 | `/board_move ~column`      | Move issue to column on the board |
 | `/duplicate #issue`        | Closes this issue and marks it as a duplicate of another issue |
-| `/move path/to/project`	     | Moves issue to another project |
-| `/tableflip`	             | Append the comment with `(╯°□°)╯︵ ┻━┻` |
-| `/shrug`	                 | Append the comment with `¯\＿(ツ)＿/¯` |
-| <code>/copy_metadata #issue &#124; !merge_request </code> | Copy labels and milestone from other issue or merge request |
+| `/move path/to/project`        | Moves issue to another project |
+| `/tableflip`               | Append the comment with `(╯°□°)╯︵ ┻━┻` |
+| `/shrug`                   | Append the comment with `¯\＿(ツ)＿/¯` |
+| <code>/copy_metadata #issue &#124; !merge_request</code> | Copy labels and milestone from other issue or merge request |

spec/services/quick_actions/interpret_service_spec.rb

@@ -775,8 +775,8 @@ describe QuickActions::InterpretService do
     end
 
     context '/copy_metadata command' do
-      let!(:todo_label) { create(:label, project: project, title: 'To Do') }
-      let!(:inreview_label) { create(:label, project: project, title: 'In Review') }
+      let(:todo_label) { create(:label, project: project, title: 'To Do') }
+      let(:inreview_label) { create(:label, project: project, title: 'In Review') }
 
       it_behaves_like 'empty command' do
         let(:content) { '/copy_metadata' }
@@ -799,6 +799,17 @@ describe QuickActions::InterpretService do
         end
       end
 
+      context 'when more than one issuable is passed' do
+        it_behaves_like 'copy_metadata command' do
+          let(:source_issuable) { create(:labeled_issue, project: project, labels: [inreview_label, todo_label]) }
+          let(:other_label) { create(:label, project: project, title: 'Other') }
+          let(:other_source_issuable) { create(:labeled_issue, project: project, labels: [other_label]) }
+
+          let(:content) { "/copy_metadata #{source_issuable.to_reference} #{other_source_issuable.to_reference}" }
+          let(:issuable) { issue }
+        end
+      end
+
       context 'cross project references' do
         it_behaves_like 'empty command' do
           let(:other_project) { create(:project, :public) }