def method_missing(method, *args)
      attr_name, suffix = method.to_s.scan(/([a-z0-9\_]+)(\?|\=)?$/i).first
      if suffix == ATTR_SETTER
        @_metaclass.send(:attr_accessor, attr_name)
        @_fields << attr_name.to_sym
        send(method, args.first)
      elsif attr_name && @_fields.include?(attr_name.to_sym)
        value = @attrs[attr_name.to_sym]
        case suffix
        when nil
          @_metaclass.send(:attr_accessor, attr_name)
          value
        when ATTR_PREDICATE then !!value
        end
      elsif suffix.nil? && SPECIAL_METHODS.include?(attr_name)
        instance_variable_get "@_#{attr_name}"
      elsif attr_name && !@_fields.include?(attr_name.to_sym)
        nil
      else
        super
      end
    end
def method_missing(method, *args)
      attr_name, suffix = method.to_s.scan(/([a-z0-9\_]+)(\?|\=)?$/i).first
      if suffix == ATTR_SETTER
        @_metaclass.send(:attr_accessor, attr_name)
        @_fields << attr_name.to_sym
        send(method, args.first)
      elsif attr_name && @_fields.include?(attr_name.to_sym)
        value = @attrs[attr_name.to_sym]
        case suffix
        when nil
          @_metaclass.send(:attr_accessor, attr_name)
          value
        when ATTR_PREDICATE then !!value
        end
      elsif suffix.nil? && SPECIAL_METHODS.include?(attr_name)
        instance_variable_get "@_#{attr_name}"
      elsif attr_name && !@_fields.include?(attr_name.to_sym)
        nil
      else
        super
      end
    end
Provides access to a resource's attributes.