read_and_insert

# File activerecord/lib/active_record/fixtures.rb, line 644
        def read_and_insert(fixtures_directories, fixture_files, class_names, connection) # :nodoc:
          fixtures_map = {}
          directory_glob = "{#{fixtures_directories.join(",")}}"
          fixture_sets = fixture_files.map do |fixture_set_name|
            klass = class_names[fixture_set_name]
            fixtures_map[fixture_set_name] = new( # ActiveRecord::FixtureSet.new
              nil,
              fixture_set_name,
              klass,
              ::File.join(directory_glob, fixture_set_name)
            )
          end
          update_all_loaded_fixtures(fixtures_map)

          insert(fixture_sets, connection)

          fixtures_map
        end