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module ActiveRecord
module AttributeMethods #:nodoc:
DEFAULT_SUFFIXES = %w(= ? _before_type_cast)
def self.included(base)
base.extend ClassMethods
base.attribute_method_suffix *DEFAULT_SUFFIXES
end
# Declare and check for suffixed attribute methods.
module ClassMethods
# 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
def attribute_method_suffix(*suffixes)
attribute_method_suffixes.concat suffixes
rebuild_attribute_method_regexp
end
# Returns MatchData if method_name is an attribute method.
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
private
# Suffixes a, ?, c become regexp /(a|\?|c)$/
def rebuild_attribute_method_regexp
suffixes = attribute_method_suffixes.map { |s| Regexp.escape(s) }
@@attribute_method_regexp = /(#{suffixes.join('|')})$/.freeze
end
# Default to =, ?, _before_type_cast
def attribute_method_suffixes
@@attribute_method_suffixes ||= []
end
end
private
# Handle *? for method_missing.
def attribute?(attribute_name)
query_attribute(attribute_name)
end
# Handle *= for method_missing.
def attribute=(attribute_name, value)
write_attribute(attribute_name, value)
end
# Handle *_before_type_cast for method_missing.
def attribute_before_type_cast(attribute_name)
read_attribute_before_type_cast(attribute_name)
end
end
end
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