Support merge to ref for merge-commit and squash

Adds the ground work for writing into
the merge ref refs/merge-requests/:iid/merge the
merge result between source and target branches of
a MR, without further side-effects such as
mailing, MR updates and target branch changes.

1 files changed, 6 insertions, 0 deletions

diff --git a/app/models/repository.rb b/app/models/repository.rb
index ed55a6e572b..cd761a29618 100644
--- a/app/models/repository.rb
+++ b/app/models/repository.rb
@@ -854,6 +854,12 @@ class Repository
     end
   end
 
+  def merge_to_ref(user, source_sha, merge_request, target_ref, message)
+    branch = merge_request.target_branch
+
+    raw.merge_to_ref(user, source_sha, branch, target_ref, message)
+  end
+
   def ff_merge(user, source, target_branch, merge_request: nil)
     their_commit_id = commit(source)&.id
     raise 'Invalid merge source' if their_commit_id.nil?