Cannot understand why does find_or_create method cannot accept model instances instead of their ids: Friendship.find_or_create_by_user_id_and_friend_id(User.first.id, User.last.id) # works just fine Friendship.find_or_create_by_user_id_and_friend_id(User.first, User.last) # and even Friendship.find_or_create_by_user_id_and_friend_id(User.first, Message.last) rollbacks because of validation (user and friend cannot be the same person): #<Friendship id: nil, user_id: 1, friend_id: 1, state: "pending", created_at: nil, updated_at: nil> So it interprets model instances as true or something like that. I've stopped my search at assign_attributes method of ActiveRecord::Base string send("#{k}=", v) Is this correct behaviour?
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