module ActiveModel::AttributeMethods::ClassMethods

person.name_short? # => NoMethodError

Person.undefine_attribute_methods

person.name_short? # => true
person.name = 'Bob'
person = Person.new

end
end
send(attr).length < 5
def attribute_short?(attr)
private

define_attribute_method :name
attribute_method_suffix '_short?'
attr_accessor :name

include ActiveModel::AttributeMethods
class Person

Removes all the previously dynamically defined methods from the class.

def undefine_attribute_methods
  generated_attribute_methods.module_eval do
    undef_method(*instance_methods)
  end
  attribute_method_matchers_cache.clear
end