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Let `User.has_one :profile`. I''ve always thought that `@user.build_profile` is a cheap thing to do - it''s just creating a new object without persisting it. But, in fact, it does 2 queries to the DB: `BEGIN` and `COMMIT`. In my app I have an admin users#index page where users'' details can be edited, and to simplify the code I build a profile whenever it''s