Populate merge requests head_pipeline_id

db/post_migrate/20170428170547_add_head_pipeline_for_each_merge_request.rb

+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

db/schema.rb

@@ -114,6 +114,7 @@ ActiveRecord::Schema.define(version: 20170506185517) do
     t.string "plantuml_url"
     t.boolean "plantuml_enabled"
     t.integer "terminal_max_session_time", default: 0, null: false
+    t.string "default_artifacts_expire_in", default: "0", null: false
     t.integer "unique_ips_limit_per_user"
     t.integer "unique_ips_limit_time_window"
     t.boolean "unique_ips_limit_enabled", default: false, null: false
@@ -123,7 +124,6 @@ ActiveRecord::Schema.define(version: 20170506185517) do
     t.integer "cached_markdown_version"
     t.boolean "clientside_sentry_enabled", default: false, null: false
     t.string "clientside_sentry_dsn"
-    t.string "default_artifacts_expire_in", default: "0", null: false
   end
 
   create_table "audit_events", force: :cascade do |t|