read_yaml_fixture_files

# File activerecord/lib/active_record/fixtures.rb, line 699
    def read_yaml_fixture_files
      yaml_string = ""
      Dir["#{@fixture_path}/**/*.yml"].select { |f| test(?f, f) }.each do |subfixture_path|
        yaml_string << IO.read(subfixture_path)
      end
      yaml_string << IO.read(yaml_file_path)

      if yaml = parse_yaml_string(yaml_string)
        # If the file is an ordered map, extract its children.
        yaml_value =
          if yaml.respond_to?(:type_id) && yaml.respond_to?(:value)
            yaml.value
          else
            [yaml]
          end

        yaml_value.each do |fixture|
          raise Fixture::FormatError, "Bad data for #{@class_name} fixture named #{fixture}" unless fixture.respond_to?(:each)
          fixture.each do |name, data|
            unless data
              raise Fixture::FormatError, "Bad data for #{@class_name} fixture named #{name} (nil)"
            end

            self[name] = Fixture.new(data, model_class)
          end
        end
      end
    end