[Rails] activerecord variable apart from member

Hi,

I have a table with a field of user_id. In find , i had created a join
on user table to retreive the username as:

@question = Question.find(params[:id], :select=>"questions.*,
users.username as username",:joins=>" inner join users on users.id =
questions.user_id");

I had created an instance variable in Question class with name
"username". But i am not able to access the data. I want to access it as
question.username. can anyone help me out.

Also i am not preffering associations to get the complete user field, as
its not being needed.
Thanks in advance.

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