Rails naming convention for Uppercase names

I've got a model class:

class QRCode < ActiveRecord::Base

  has_many :properties

end

So rails needs a database table named 'qr_codes' and a foreign key called 'qr_code_id'. But as a relationship in my Property Model it needs another name:

class Property < ActiveRecord::Base

  belongs_to :q_r_code

end

So if I want to create a Property object I' have to say ':q_r_code => qrcode' But active_record wants a qr_code property, because the column is called 'qr_code_id'

Do I understand something wrong or is this type of name impossible to map for Rails?

PS: I'm using Rails 3.0.3

---

belongs_to接受:foreign_key和:class_name属性。

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