conditional model validation

Hola,

I'm searching without much luck and can't see the answer in the docs.

Am wanting to override the is_valid() method on a model (I think
that's what I want).

Basically, I have a choices field, and if one of those choices is
selected, then I want a description field to be not blank/not the
empty string. If it's the other two choices, I want the description
field to be blank/empty string.

First, I override is_valid() as a model method?

Second, how do I return a false from is_valid()?

ie, this is a rough up of what I'm looking for - what goes in place of
return FALSE/TRUE?

def is_valid(self):

if enrolment.mark == 'W': #student has withdrawn from course
-if enrolment.withdrawal_reason == '': #must have reason
--return FALSE
elif enrolment.withdrawal.reason != "": #ie, since enrolment.mark
isn't 'W', confirm that the enrolment.reason is ""
-return FALSE
else:
-return TRUE

Cheers
L.
--
...we look at the present day through a rear-view mirror. This is
something Marshall McLuhan said back in the Sixties, when the world
was in the grip of authentic-seeming future narratives. He said, "We
look at the present through a rear-view mirror. We march backwards
into the future."

http://www.warrenellis.com/?p=14314

--
You received this message because you are subscribed to the Google Groups "Django users" group.
To post to this group, send email to django-users@googlegroups.com.
To unsubscribe from this group, send email to django-users+unsubscribe@googlegroups.com.
For more options, visit this group at http://groups.google.com/group/django-users?hl=en.