1 files changed, 23 insertions, 0 deletions
diff --git a/db/migrate/20210420221106_update_merge_requests_iteration_foreign_key.rb b/db/migrate/20210420221106_update_merge_requests_iteration_foreign_key.rb
new file mode 100644
index 00000000000..64786f0b20c
--- /dev/null
+++ b/db/migrate/20210420221106_update_merge_requests_iteration_foreign_key.rb
@@ -0,0 +1,23 @@
+# frozen_string_literal: true
+
+class UpdateMergeRequestsIterationForeignKey < ActiveRecord::Migration[6.0]
+  include Gitlab::Database::MigrationHelpers
+
+  disable_ddl_transaction!
+
+  def up
+    with_lock_retries do
+      remove_foreign_key_if_exists(:merge_requests, column: :sprint_id)
+    end
+
+    add_concurrent_foreign_key(:merge_requests, :sprints, column: :sprint_id, on_delete: :nullify)
+  end
+
+  def down
+    with_lock_retries do
+      remove_foreign_key_if_exists(:merge_requests, column: :sprint_id)
+    end
+
+    add_concurrent_foreign_key(:merge_requests, :sprints, column: :sprint_id, on_delete: :cascade)
+  end
+end