def valid?
      sort_validator = EnumAttributeValidator.new('String', ["COUNT", "INDEX"])
      return false unless sort_validator.valid?(@sort)
      method_validator = EnumAttributeValidator.new('String', ["ENUM", "FC"])
      return false unless method_validator.valid?(@method)
      return true
    end
def valid?
      sort_validator = EnumAttributeValidator.new('String', ["COUNT", "INDEX"])
      return false unless sort_validator.valid?(@sort)
      method_validator = EnumAttributeValidator.new('String', ["ENUM", "FC"])
      return false unless method_validator.valid?(@method)
      return true
    end
Check to see if the all the properties in the model are valid
 @return true if the model is valid