1 files changed, 23 insertions, 0 deletions
diff --git a/db/post_migrate/20170428170547_add_head_pipeline_for_each_merge_request.rb b/db/post_migrate/20170428170547_add_head_pipeline_for_each_merge_request.rb
new file mode 100644
index 00000000000..0e139c28402
--- /dev/null
+++ b/db/post_migrate/20170428170547_add_head_pipeline_for_each_merge_request.rb
@@ -0,0 +1,23 @@
+class AddHeadPipelineForEachMergeRequest < ActiveRecord::Migration
+  DOWNTIME = false
+
+  class Pipeline < ActiveRecord::Base
+    self.table_name = "ci_pipelines"
+
+    def self.last_per_branch
+      select('ref, MAX(id) as head_id, project_id').group(:ref).group(:project_id)
+    end
+  end
+
+  class MergeRequest < ActiveRecord::Base; end
+
+  def up
+    Pipeline.last_per_branch.each do |pipeline|
+      mrs = MergeRequest.where(source_branch: pipeline.ref, source_project_id: pipeline.project_id)
+      mrs.update_all(head_pipeline_id: pipeline.head_id)
+    end
+  end
+
+  def down
+  end
+end