How do I replicate class_inheritable_accessor's behavior in Rails 3.1?

Question

Beginning with Rails 3.1, class_inheritable_accessor produces deprecation warnings, telling me to use class_attribute instead. But class_attribut

Answer 1

class_attribute won't pollute its parent if it's used as intended. Make sure you're not changing the mutable items in-place.

types_and_classes.keys.each do |t|
  self.presented = presented.merge({t => types_and_classes[t]})
end

Answer 2

Give this a try, a great way to have attributes set on the class, and not polluted by inheritance or instances.

class Class

  private

  # Sets Unique Variables on a resource
  def inheritable_attr_accessor(*attrs)
    attrs.each do |attr|

      # Class Setter, Defining Setter
      define_singleton_method "#{attr}=".to_sym do |value|
        define_singleton_method attr do
          value
        end
      end

      # Default to nil
      self.send("#{attr}=".to_sym, nil)

      # Instance Setter
      define_method "#{attr}=".to_sym do |value|
        eval("@_#{attr} = value")
      end

      # Instance Getter, gets class var if nil
      define_method attr do
        eval("defined?(@_#{attr})") ? eval("@_#{attr}") : self.class.send(attr)
      end

    end
  end

end