#21528: improve Django Doc with an example for formfield_for_foreignkey
accessing
parent ID
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Reporter: anonymous | Owner: nobody
Type: Cleanup/optimization | Status: new
Component: Documentation | Version: master
Severity: Normal | Resolution:
Keywords: | Triage Stage: Accepted
Has patch: 1 | Needs documentation: 0
Needs tests: 0 | Patch needs improvement: 1
Easy pickings: 0 | UI/UX: 0
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Comment (by Tobias Kunze):
For reference, the blog post referred to in the original issue can be
found
[https://web.archive.org/web/20130403060642/http://www.stereoplex.com/blog
/filtering-dropdown-lists-in-the-django-admin/ on the web archive], and
the relevant code reads like this:
{{{
class MountaineeringInfoInline(admin.TabularInline):
model = MountaineeringInfo
formset = MountaineeringInfoInlineFormset
def formfield_for_dbfield(self, field, **kwargs):
if field.name == 'area':
# Note - get_object hasn't been defined yet
parent_trip = self.get_object(kwargs['request'], Trip)
contained_areas =
Area.objects.filter(area__contains=parent_trip.area.area)
return forms.ModelChoiceField(queryset=contained_areas)
return super(MountaineeringInfoInline,
self).formfield_for_dbfield(field, **kwargs)
def get_object(self, request, model):
object_id = request.META['PATH_INFO'].strip('/').split('/')[-1]
try:
object_id = int(object_id)
except ValueError:
return None
return model.objects.get(pk=object_id)
}}}
At least mentioning `formfield_for_dbfield` in the docs at all, anywhere,
sounds like a good idea to me, regardless of the specifics on how to get
the current pk or instance.
--
Ticket URL: <https://code.djangoproject.com/ticket/21528#comment:5>
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