    # File lib/active_record/fixtures.rb, line 493
      def self.create_fixtures(fixtures_directory, table_names, class_names = {})
        table_names = [table_names].flatten.map { |n| n.to_s }
        connection  = block_given? ? yield : ActiveRecord::Base.connection

        table_names_to_fetch = table_names.reject { |table_name| fixture_is_cached?(connection, table_name) }

        unless table_names_to_fetch.empty?
          ActiveRecord::Base.silence do
            connection.disable_referential_integrity do
              fixtures_map = {}

              fixtures = table_names_to_fetch.map do |table_name|
                fixtures_map[table_name] = Fixtures.new(connection, File.split(table_name.to_s).last, class_names[table_name.to_sym], File.join(fixtures_directory, table_name.to_s))
              end

              all_loaded_fixtures.update(fixtures_map)

              connection.transaction(:requires_new => true) do
                fixtures.reverse.each { |fixture| fixture.delete_existing_fixtures }
                fixtures.each { |fixture| fixture.insert_fixtures }

                # Cap primary key sequences to max(pk).
                if connection.respond_to?(:reset_pk_sequence!)
                  table_names.each do |table_name|
                    connection.reset_pk_sequence!(table_name)
                  end
                end
              end

              cache_fixtures(connection, fixtures_map)
            end
          end
        end
        cached_fixtures(connection, table_names)
      end