And there's 2 other options to consider:
* The ne lookup is actually the first example in the documentation for
custom
lookups[1]. So you get its implementation for free and can consider adding it.
* You can extend Field to add exclude_choices() which sets
limit_choices_to to the
negation of the argument as below - so wrap it with ~Q().
All depending on how isolated your case is in the project/app.
On Tuesday 31 January 2017 23:48:28 C. Kirby wrote:
> django doesn't have an ne operator in the orm. You want to use a
> negated Q object for your limit_choices_to. try:
>
> from django.db.models import Q
>
> phone = models.ManyToManyField(Phone, limit_choices_to = ~Q(type_id =
> 'C'))
> On Wednesday, February 1, 2017 at 6:17:52 AM UTC+2, Gordon Burgess wrote:
> > I have this code, and with Django 1.10 it works as expected:
> >
> > class Location(models.Model):
> > name = models.CharField(max_length = 32, unique = True)
> > street = models.CharField(max_length = 32)
> > detail = models.CharField(max_length = 32, blank = True, null =
> > True)
> > city = models.CharField(max_length = 32)
> > state = USStateField()
> > zip = USZipCodeField()
> > phone = models.ManyToManyField(Phone, limit_choices_to =
> >
> > {'type_id':'H'})
> >
> > but what I'd like to do is restrict the choices of phone numbers for
> > Locations to those that aren't 'C' (cell phones) - I've found some
> > hints,>
> > but they're all for older versions of Django - it seems like:
> > phone = models.ManyToManyField(Phone, limit_choices_to =
> >
> > {'type_id__ne':'C'})
> >
> > ought to work - but this provokes a TypeError:
> >
> > Related Field got invalid lookup: ne
> >
> > Thanks!
--
Melvyn Sopacua
--------
[1] https://docs.djangoproject.com/en/1.10/howto/custom-lookups/
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