Rails - Aug 2006 - Polymorphic Destroy

Is there a clever way to destroy just the link in Polymorphic 
association? For instance, in the example they have folders containing 
images. If I want to destroy the link from the folder to the image (not 
the image and not the folder), do I have to search through the join 
models to find the correct join model that links the folder and the 
image, or is there a more clever way? That''s what I''m doing
now, and it
feels a little dumb.

Thanks.

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