attribute_method_prefix

Declares a method available for all attributes with the given prefix. Uses method_missing and respond_to? to rewrite the method.

#{prefix}#{attr}(*args, &block) 

to

#{prefix}attribute(#{attr}, *args, &block) 

An instance method #{prefix}attribute must exist and accept at least the attr argument.

class Person include ActiveModel::AttributeMethods attr_accessor :name attribute_method_prefix 'clear_' define_attribute_methods :name private def clear_attribute(attr) send("#{attr}=", nil) end end person = Person.new person.name = 'Bob' person.name # => "Bob" person.clear_name person.name # => nil