[Rails] Newbie: I just want to exclude two attributes when I call update_attributes

I have two virtual attributes in my model. Let's call them "hours_worked" and "minutes_worked".

I use them to calculate "work_time", which is an integer I store -- it's the total minutes worked (e.g. 3.5 hours is 210).

I want :hours_worked and :minutes_worked to NEVER appear in the database.

But when @foo.update_attributes(params[:foo]) is called, it bombs.

Any help would be appreciated. Thirty years software development experience and I just can't seem to pick up Rails. ARGH!!!

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