diff options
| -rw-r--r-- | db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb | 37 |
1 files changed, 37 insertions, 0 deletions
diff --git a/db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb b/db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb new file mode 100644 index 00000000000..a7106111f46 --- /dev/null +++ b/db/migrate/20181031190558_drop_fk_gcp_clusters_table.rb @@ -0,0 +1,37 @@ +# frozen_string_literal: true + +class DropFkGcpClustersTable < ActiveRecord::Migration + include Gitlab::Database::MigrationHelpers + + DOWNTIME = false + + disable_ddl_transaction! + + def up + remove_foreign_key_if_exists :gcp_clusters, column: :project_id + remove_foreign_key_if_exists :gcp_clusters, column: :user_id + remove_foreign_key_if_exists :gcp_clusters, column: :service_id + end + + def down + add_foreign_key_if_not_exists :gcp_clusters, :projects, column: :project_id, on_delete: :cascade + add_foreign_key_if_not_exists :gcp_clusters, :users, column: :user_id, on_delete: :nullify + add_foreign_key_if_not_exists :gcp_clusters, :services, column: :service_id, on_delete: :nullify + end + + private + + def add_foreign_key_if_not_exists(source, target, column:, on_delete:) + return unless table_exists?(source) + return if foreign_key_exists?(source, target, column: column) + + add_concurrent_foreign_key(source, target, column: column, on_delete: on_delete) + end + + def remove_foreign_key_if_exists(table, column:) + return unless table_exists?(table) + return unless foreign_key_exists?(table, column: column) + + remove_foreign_key(table, column: column) + end +end |