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Contents
module Hooks
module InheritableAttribute
# Creates an inheritable attribute with accessors in the singleton class. Derived classes inherit the
# attributes. This is especially helpful with arrays or hashes that are extended in the inheritance
# chain. Note that you have to initialize the inheritable attribute.
#
# Example:
#
# class Cat
# inheritable_attr :drinks
# self.drinks = ["Becks"]
#
# class Garfield < Cat
# self.drinks << "Fireman's 4"
#
# and then, later
#
# Cat.drinks #=> ["Becks"]
# Garfield.drinks #=> ["Becks", "Fireman's 4"]
def inheritable_attr(name)
instance_eval %Q{
def #{name}=(v)
@#{name} = v
end
def #{name}
return @#{name} unless superclass.respond_to?(:#{name}) and value = superclass.#{name}
@#{name} ||= value.clone # only do this once.
end
}
end
end
end
Version data entries
52 entries across 52 versions & 2 rubygems