accepts_nested_attributes + polymorphic association

im having an issue where my my polymorphic associations arent being deleted when using accepts nested attributes there are other accepts_nested_attributes being used and they are deleting fine, just the polymorphic association before i go down the path of intense thrashing at this...is this a known issue or problem?

i was so wrapped up in the polymorphic + nested attributes, i forgot :dependent => :destroy on the model i was having issues with

doh!