Declare and check for suffixed attribute methods.

Methods
Public Instance methods
attribute_method_suffix(*suffixes)

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

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

to

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

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

For example:

  class Person < ActiveRecord::Base
    attribute_method_suffix '_changed?'

    private
      def attribute_changed?(attr)
        ...
      end
  end

  person = Person.find(1)
  person.name_changed?    # => false
  person.name = 'Hubert'
  person.name_changed?    # => true
    # File vendor/rails/activerecord/lib/active_record/attribute_methods.rb, line 35
35:       def attribute_method_suffix(*suffixes)
36:         attribute_method_suffixes.concat suffixes
37:         rebuild_attribute_method_regexp
38:       end
match_attribute_method?(method_name)

Returns MatchData if method_name is an attribute method.

    # File vendor/rails/activerecord/lib/active_record/attribute_methods.rb, line 41
41:       def match_attribute_method?(method_name)
42:         rebuild_attribute_method_regexp unless defined?(@@attribute_method_regexp) && @@attribute_method_regexp
43:         @@attribute_method_regexp.match(method_name)
44:       end