On Oct 24, 5:14 am, Tim Valenta <tonightslasts...@gmail.com> wrote:
> I've been searching for a while on how to intercept querysets in
> forms, to apply a custom filter to the choices on both foreignkey and
> m2m widgets. I'm surprised at how there are so many similar questions
> out there, dating back to 2006.
[snip]
> The only solution I've seen has dealt with filtering by User foreign
> key (being that User is available in the request object in views), and
> that's primarily for non-Admin views.
[snip]
> I've been looking at the code for the above noted API method,
> formfield_for_foreignkey, and I really can't see a way to get
> references to an instance of the object being edited. I would need
> such a reference to successfully override that method and filter my
> queryset on this relationship.
I too spent some time looking at formfield_for_foreignkey, and had no
luck.
You can subclass ModelAdmin, and then limit the objects in the field's
queryset.
** admin.py **
class LocationAdminForm(forms.ModelForm):
def __init__(self, *args, **kwargs):
forms.ModelForm.__init__(self, *args, **kwargs)
location = kwargs.get('instance', None)
if location:
self.fields['contract'].queryset = Contract.objects.filter
(company=location.company)
class LocationAdmin(admin.ModelAdmin):
model = Location
form = LocationAdminForm
I also had to do something similar with Inlines, when I did the same
type of thing. This is not my exact code, but it is very close, and
suited toward your use case.
Matt.
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