mongoid multi parameter attributes problem with date

I have been following the mongoid railscast and I am facing a multi parameter attributes problem when i add a new field field :published_on, :type => Date

Article.find("4da14b1447640b14eb000002开发者_StackOverflow").published_on 
=> nil

but with Article.find('4da14b1447640b14eb000002')

=> published_on: nil, published_on(1i): "2011", published_on(2i): "6", published_on(3i): "10"

How do i get the desire output?

i know there is a temporary solution https://gist.github.com/315227

but the issue of this problem is closed and I have the latest 2.0.1 mongoid gem and yet the problem occur.

Modify your Article class so it looks like the one below.

class Article
  include Mongoid::Document
  include Mongoid::MultiParameterAttributes

  ...
end

In case you're using Mongoid 4.0 - the Mongoid::MultiParameterAttributes has been removed there.

If you need this functionality anyway you may take the classes from this blog.