Module: ActiveRecord::AttributeMethods::ClassMethods

Defined in:
lib/active_record/attribute_methods.rb

Overview

Declare and check for suffixed attribute methods.

Instance Method Summary collapse

Instance Method Details

#attribute_method_suffix(*suffixes) ⇒ Object

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



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# File 'lib/active_record/attribute_methods.rb', line 35

def attribute_method_suffix(*suffixes)
  attribute_method_suffixes.concat suffixes
  rebuild_attribute_method_regexp
end

#match_attribute_method?(method_name) ⇒ Boolean

Returns MatchData if method_name is an attribute method.

Returns:

  • (Boolean) 


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# File 'lib/active_record/attribute_methods.rb', line 41

def match_attribute_method?(method_name)
  rebuild_attribute_method_regexp unless defined?(@@attribute_method_regexp) && @@attribute_method_regexp
  @@attribute_method_regexp.match(method_name)
end