I have two classes, Application & Package, that are related through
HABTM.

I want it such that when a user is creating an application she must
choose a package as well.  I don't think I can do this in the
application model, so I guess I have to do it in the controller.  My
problem is I am not sure how to go about this.  I tried doing a $this-
>Application->invalidate('Package'); but that doesn't work.

Any thoughts?
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