I'm looking for something in the framework that I think must exist
somewhere but can't seem to find anything. I'm after a bit of code
that takes a dictionary (a.k.a the POST dictionary) and a model
instance, then merges the two into a new dictionary. The new
dictionary then contains all values from the POST plus any missing
values added from the model.

The reason I need this is because I have a form to modify a model but
the form is a cut down form. When I save the form it blanks out any
values that it didn't contain for the model. I don't want to blank out
those it didn't contain, I just want to save the ones it did contain.

Hope that makes sense.

- Tom

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