[Rails] Associations in models - am I doing it wrong?

One of my modesl looks like this:

class UnprocessedPage < ActiveRecord::Base

     has_one :user

     attr_accessible :url, :user_id

end

Do I need :user_id?  Or is it implied via "has_one :user"?

This is working as is.. but when I look for examples of other things, I never see any attributes with *_id... so I'm wondering if it's implied and I'm just mucking things up?

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