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# File 'lib/attr_inherited.rb', line 11
def attr_inherited(*attrs)
if attrs.last.is_a? Hash
options = attrs.pop
end
_parent = options[:from] || 'parent'
_predicate = options[:when] && options[:when].to_s || 'nil?'
raise ArgumentError.new("Can't specify :as for multiple attributes in a single line") if attrs.size > 1 && options[:as].present?
attrs.each do |attr|
_alias = options[:as] || attr
class_eval <<-END, __FILE__, __LINE__
def #{_alias}_before_type_cast
_super = super
!_super.#{_predicate} && super || #{_parent} && #{_parent}.#{attr}_before_type_cast
end
def #{_alias}
_super = super
!_super.#{_predicate} && _super || #{_parent} && #{_parent}.#{attr} && !#{_parent}.#{attr}.#{_predicate} && #{_parent}.#{attr} || _super
end
def #{_alias}=(value)
super(value) if #{_parent}.nil? || #{_parent}.#{attr}.#{_predicate} || (#{_parent} && #{_parent}.#{attr} && #{_parent}.#{attr} != value)
end
def #{_alias}_inherited?
#{_parent}.#{attr} == self.#{attr}
end
END
end
end
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