I need to override the setter behavior of all the fields in all my
models.  They all subclass from the same abstract model.

Specifically if the fields already contains a special character (used to
indicate "Not Applicable") I don' want to allow it to be changed.  The
same field will be applicable in some types of records but not in
others.  The updates come from an external backend http query that I use
to get data from a legacy system. That legacy system does not know if a
field is applicable or not.

I've got about 25 tables and a total of 500 fields.  I would like to
build this feature into the abstract model and not have to not have
custome code for each field update..

I would like to override the "setter" method in my abstract model, but
cannot seem to get that to work, tried numerous variants.  I am a Django
newbie, but I've spent a day with the docs, books and google with no
success.

Can someone point me to a snippet or a coherent example/explanation on
how to do this.  I'm using Django 1.2 with Python 2.4.

Thanks,

Fred Sells

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