1 files changed, 32 insertions, 0 deletions
diff --git a/app/services/merge_requests/pushed_branches_service.rb b/app/services/merge_requests/pushed_branches_service.rb
new file mode 100644
index 00000000000..afcf0f7678a
--- /dev/null
+++ b/app/services/merge_requests/pushed_branches_service.rb
@@ -0,0 +1,32 @@
+# frozen_string_literal: true
+
+module MergeRequests
+  class PushedBranchesService < MergeRequests::BaseService
+    include ::Gitlab::Utils::StrongMemoize
+
+    # Skip moving this logic into models since it's too specific
+    # rubocop: disable CodeReuse/ActiveRecord
+    def execute
+      return [] if branch_names.blank?
+
+      source_branches = project.source_of_merge_requests.opened
+        .from_source_branches(branch_names).pluck(:source_branch)
+
+      target_branches = project.merge_requests.opened
+        .by_target_branch(branch_names).distinct.pluck(:target_branch)
+
+      source_branches.concat(target_branches).to_set
+    end
+    # rubocop: enable CodeReuse/ActiveRecord
+
+    private
+
+    def branch_names
+      strong_memoize(:branch_names) do
+        params[:changes].map do |change|
+          Gitlab::Git.branch_name(change[:ref])
+        end.compact
+      end
+    end
+  end
+end