class method self.check_all_pending!

# File activerecord/lib/active_record/migration.rb, line 693
      def check_all_pending!
        pending_migrations = []

        ActiveRecord::Tasks::DatabaseTasks.with_temporary_pool_for_each(env: env) do |pool|
          if pending = pool.migration_context.open.pending_migrations
            pending_migrations << pending
          end
        end

        migrations = pending_migrations.flatten

        if migrations.any?
          raise ActiveRecord::PendingMigrationError.new(pending_migrations: migrations)
        end
      end