Re: conditional model validation

Let me try to assist. A forms is_valid method causes 3 types of
cleaning methods to be run. Based on that, I'm sure you really don't
need to override it.

I really don't understand what you mean by "I want the description
field to be not blank/not the empty string" so maybe I could have been
of more help but I'm sure a solution to your problem would be to
override either the form's clean_fieldname or clean methods.

Check: https://docs.djangoproject.com/en/dev/ref/forms/validation/
which is a link to the documentation on form validation

On 9/28/12, Lachlan Musicman <datakid@gmail.com> wrote:
> 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 if enrolment.mark == 'W': #student has withdrawn from course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
>
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