read_fixture_files

# File activerecord/lib/active_record/fixtures.rb, line 657
      def read_fixture_files
        if File.file?(yaml_file_path)
          read_yaml_fixture_files
        elsif File.file?(csv_file_path)
          read_csv_fixture_files
        else
          raise FixturesFileNotFound, "Could not find #{yaml_file_path} or #{csv_file_path}"
        end
      end