# File lib/database_cleaner/data_mapper/truncation.rb, line 154
      def clean(repository = nil)
        repository = self.db if repository.nil?
        adapter = ::DataMapper.repository(repository).adapter
        adapter.disable_referential_integrity do
          tables_to_truncate(repository).each do |table_name|
            adapter.truncate_table table_name
          end
        end
      end