insert

# File activerecord/lib/active_record/fixtures.rb, line 665
        def insert(fixture_sets, connection_pool) # :nodoc:
          fixture_sets_by_pool = fixture_sets.group_by do |fixture_set|
            if fixture_set.model_class
              fixture_set.model_class.connection_pool
            else
              connection_pool
            end
          end

          fixture_sets_by_pool.each do |pool, set|
            table_rows_for_connection = Hash.new { |h, k| h[k] = [] }

            set.each do |fixture_set|
              fixture_set.table_rows.each do |table, rows|
                table_rows_for_connection[table].unshift(*rows)
              end
            end

            pool.with_connection do |conn|
              conn.insert_fixtures_set(table_rows_for_connection, table_rows_for_connection.keys)

              check_all_foreign_keys_valid!(conn)

              # Cap primary key sequences to max(pk).
              if conn.respond_to?(:reset_pk_sequence!)
                set.each { |fs| conn.reset_pk_sequence!(fs.table_name) }
              end
            end
          end
        end