Merge branch '26437-closed-by' into 'master'

Add issues/:iid/closed_by api endpoint

Closes #26437

See merge request !10511

1 files changed, 15 insertions, 0 deletions

diff --git a/lib/api/issues.rb b/lib/api/issues.rb
index 244725bb292..522f0f3be92 100644
--- a/lib/api/issues.rb
+++ b/lib/api/issues.rb
@@ -219,6 +219,21 @@ module API
         authorize!(:destroy_issue, issue)
         issue.destroy
       end
+
+      desc 'List merge requests closing issue'  do
+        success Entities::MergeRequestBasic
+      end
+      params do
+        requires :issue_iid, type: Integer, desc: 'The internal ID of a project issue'
+      end
+      get ':id/issues/:issue_iid/closed_by' do
+        issue = find_project_issue(params[:issue_iid])
+
+        merge_request_ids = MergeRequestsClosingIssues.where(issue_id: issue).select(:merge_request_id)
+        merge_requests = MergeRequestsFinder.new(current_user, project_id: user_project.id).execute.where(id: merge_request_ids)
+
+        present paginate(merge_requests), with: Entities::MergeRequestBasic, current_user: current_user, project: user_project
+      end
     end
   end
 end