How can I use Mongoid and ActiveRecord in parallel in Rails 3?

Question

I\'m using rails 3, and began my application with ActiveRecord. Now, I have many models, and the relations are starting to get complicated, and some could be more simply expres

Answer 1

What I did was just mock the relationship with methods in each the AR model and the Mongoid model like so.

# visit_session.rb
class VisitSession
  include Mongoid::Document
  include Mongoid::Timestamps

  field :user_id, type: Integer
  index({user_id: 1},{name: :user_id_index})

  # Mock a belongs_to relationship with User model
  def user
    User.find(self.user_id)
  end
end

# user.rb
class User < ActiveRecord::Base

  # Mock a has_many relationship with VisitSession Mongoid model
  def visit_sessions
    VisitSession.where(user_id: self.id)
  end
end

Of course you won't have all the AR methods on VisitSession Mongoid model but you'll at least be able to mock the relationship between the two fairly well.

Hope this helps.