[Rails] Help with habtm

[Gm]

Hi,

I'm using habtm to create a relationship between two models:

class Question < ActiveRecord::Base
  has_and_belongs_to_many :exams
end

class Exam < ActiveRecord::Base
  has_and_belongs_to_many :questions
end

At some point I'm doing this:

class Exam < ActiveRecord::Base
   has_and_belongs_to_many :questions

   def generate
      (1..5).each do
         questions.create(Question::SKELETON)
      end
   end
end

When I do that, a sql inserts a record inside questions_exams table.
But this table has another column called: 'order' where I need to put some 
data inside

How can I populate the 'order' column inside join table ?

questions_exams
   - question_id
   - exam_id
*   - order*

Thanks.

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