instance method fixtures

# File activerecord/lib/active_record/test_fixtures.rb, line 56
      def fixtures(*fixture_set_names)
        if fixture_set_names.first == :all
          raise StandardError, "No fixture path found. Please set `#{self}.fixture_paths`." if fixture_paths.blank?
          fixture_set_names = fixture_paths.flat_map do |path|
            names = Dir[::File.join(path, "{**,*}/*.{yml}")].uniq
            names.reject! { |f| f.start_with?(file_fixture_path.to_s) } if defined?(file_fixture_path) && file_fixture_path
            names.map! { |f| f[path.to_s.size..-5].delete_prefix("/") }
          end.uniq
        else
          fixture_set_names = fixture_set_names.flatten.map(&:to_s)
        end

        self.fixture_table_names = (fixture_table_names | fixture_set_names).sort
        setup_fixture_accessors(fixture_set_names)
      end