I would like to accomplish the following:
class Foo(models.Model):
bar = models.CharField()
baz = function(self.bar)
Of course this doesn't work (at least as I want it to), but I'm guessing
that most humans will know what I'm trying to do. What I want is:
1) User supplies value for 'bar'
2) User clicks 'Save'
3) baz column gets value returned by 'function' (which will be a large
string)
I don't care if 'baz' shows up on the Admin form, so long as after saving
the calculated value shows up. I could probably do this with a DB trigger,
but I'd like to do it the Django way. A trigger would also not be
RDBMS-neutral I considered using signals, but:
1) I don't think I can use pre_save, since I don't have a row yet.
2) I don't think I can use post_save because I don't know of a way to
identify the right row. Also, post_save would make the transaction
non-atomic (right?) If "function" threw an exception for example, the row
would still get saved.
If I do use a signal, I'd also like to avoid using raw SQL if possible. I'd
have to hard-code table, column names, which seems ugly to me. I just know
there's a quick, elegant way of doing this. I'm just not Django savvy
enough yet.
Thank you!
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