1 files changed, 33 insertions, 0 deletions
diff --git a/db/migrate/20200623073431_add_source_merge_request_id_to_resource_state_events.rb b/db/migrate/20200623073431_add_source_merge_request_id_to_resource_state_events.rb
new file mode 100644
index 00000000000..8970797d3c0
--- /dev/null
+++ b/db/migrate/20200623073431_add_source_merge_request_id_to_resource_state_events.rb
@@ -0,0 +1,33 @@
+# frozen_string_literal: true
+
+class AddSourceMergeRequestIdToResourceStateEvents < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  INDEX_NAME = 'index_resource_state_events_on_source_merge_request_id'
+
+  DOWNTIME = false
+
+  disable_ddl_transaction!
+
+  def up
+    unless column_exists?(:resource_state_events, :source_merge_request_id)
+      add_column :resource_state_events, :source_merge_request_id, :bigint
+    end
+
+    unless index_exists?(:resource_state_events, :source_merge_request_id, name: INDEX_NAME)
+      add_index :resource_state_events, :source_merge_request_id, name: INDEX_NAME # rubocop: disable Migration/AddIndex
+    end
+
+    unless foreign_key_exists?(:resource_state_events, :merge_requests, column: :source_merge_request_id)
+      with_lock_retries do
+        add_foreign_key :resource_state_events, :merge_requests, column: :source_merge_request_id, on_delete: :nullify # rubocop:disable Migration/AddConcurrentForeignKey
+      end
+    end
+  end
+
+  def down
+    with_lock_retries do
+      remove_column :resource_state_events, :source_merge_request_id
+    end
+  end
+end