76 lines
2.3 KiB
Ruby
76 lines
2.3 KiB
Ruby
module ActiveRecord
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module AttributeMethods #:nodoc:
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DEFAULT_SUFFIXES = %w(= ? _before_type_cast)
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def self.included(base)
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base.extend ClassMethods
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base.attribute_method_suffix *DEFAULT_SUFFIXES
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end
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# Declare and check for suffixed attribute methods.
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module ClassMethods
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# Declare a method available for all attributes with the given suffix.
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# Uses method_missing and respond_to? to rewrite the method
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# #{attr}#{suffix}(*args, &block)
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# to
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# attribute#{suffix}(#{attr}, *args, &block)
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#
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# An attribute#{suffix} instance method must exist and accept at least
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# the attr argument.
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#
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# For example:
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# class Person < ActiveRecord::Base
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# attribute_method_suffix '_changed?'
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#
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# private
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# def attribute_changed?(attr)
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# ...
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# end
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# end
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#
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# person = Person.find(1)
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# person.name_changed? # => false
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# person.name = 'Hubert'
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# person.name_changed? # => true
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def attribute_method_suffix(*suffixes)
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attribute_method_suffixes.concat suffixes
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rebuild_attribute_method_regexp
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end
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# Returns MatchData if method_name is an attribute method.
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def match_attribute_method?(method_name)
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rebuild_attribute_method_regexp unless defined?(@@attribute_method_regexp) && @@attribute_method_regexp
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@@attribute_method_regexp.match(method_name)
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end
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private
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# Suffixes a, ?, c become regexp /(a|\?|c)$/
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def rebuild_attribute_method_regexp
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suffixes = attribute_method_suffixes.map { |s| Regexp.escape(s) }
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@@attribute_method_regexp = /(#{suffixes.join('|')})$/.freeze
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end
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# Default to =, ?, _before_type_cast
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def attribute_method_suffixes
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@@attribute_method_suffixes ||= []
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end
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end
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private
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# Handle *? for method_missing.
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def attribute?(attribute_name)
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query_attribute(attribute_name)
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end
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# Handle *= for method_missing.
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def attribute=(attribute_name, value)
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write_attribute(attribute_name, value)
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end
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# Handle *_before_type_cast for method_missing.
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def attribute_before_type_cast(attribute_name)
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read_attribute_before_type_cast(attribute_name)
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end
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end
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end
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