How to compare null in rails active record query

Question

How can I match null in rails active record.

User.where(['id = ? and active = ? and activation_code = ?', params[:id], 0, NULL]).first

or

 User.where(['id = ? and active = ? and activation_code = ?', params[:id], 0, nil]).first

Both are not working.

Answer 1

In Rails 4 you can do this:

User.where(id: params[:id], active: 0).where.not(activation_code: nil)