new

# File activerecord/lib/active_record/fixtures.rb, line 471
      def initialize(class_names, config)
        @class_names = class_names.stringify_keys
        @config      = config

        # Remove string values that aren't constants or subclasses of AR
        @class_names.delete_if do |klass_name, klass|
          !insert_class(@class_names, klass_name, klass)
        end
      end