read_fixture_files

# File activerecord/lib/active_record/fixtures.rb, line 641
      def read_fixture_files
        yaml_files = Dir["#{@path}/{**,*}/*.yml"].select { |f|
          ::File.file?(f)
        } + [yaml_file_path]

        yaml_files.each do |file|
          FixtureSet::File.open(file) do |fh|
            fh.each do |fixture_name, row|
              fixtures[fixture_name] = ActiveRecord::Fixture.new(row, model_class)
            end
          end
        end
      end