I think I've needed and implemented this twice now, so let's make a post about it.
The problem occurs when you are using f.fields_for and nested forms, as per these railscasts, and the nested objects are using STI.
(Will leave a more detailed explanation for future posts).
Update 1: Even though this works as described, I don't think it solves my problem. Will post again if I figure it out...
Update 2: Found this which is I think what I was using last time I had this problem... :S
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