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Versions: 54
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Contents
#This module allows for an attribute to be defined on a superclass and carry down into sub-classes with its default.
#Taken from http://railstips.org/blog/archives/2006/11/18/class-and-instance-variables-in-ruby/
module ClassLevelInheritableAttributes
def self.included(base)
base.extend(ClassMethods)
end
module ClassMethods
def inheritable_attributes(*args)
#for some reason, in rails, @inheritable_attributes is set to be an empty hash here...
#check for this strange case and account for it.
@inheritable_attributes = [:inheritable_attributes] if @inheritable_attributes == {} ||
@inheritable_attributes == nil
@inheritable_attributes += args
args.each do |arg|
class_eval %(
class << self; attr_accessor :#{arg} end
)
end
@inheritable_attributes
end
def inherited(subclass)
@inheritable_attributes.each do |inheritable_attribute|
instance_var = "@#{inheritable_attribute}"
subclass.instance_variable_set(instance_var, instance_variable_get(instance_var))
end
end
end
end
Version data entries
54 entries across 54 versions & 2 rubygems