From: "Jan E." <lists@...>
Date: 2012-07-17T20:20:30+09:00
Subject: Re: undefined method error

Hi,

Well, obviously the "Rid" object (whatever that is) doesn't have a 
"database_column" method, while "self" does. So the solution is to 
simply call the method on the correct object.

What is self.class?

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