Rails - Feb 2006 - Deleting the association entry for has_and_belongs_to_many when one object is destroyed

I know that for has_many, and has_one.

I can do :dependent => true and the associated object will be
destroyed when the main object is destroyed.

However, there does not seem to be a dependent like option for
has_and_belongs_to_many.

Is there one I do not know of?  Is there a simple solution to this?

Thanks,

Brian

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