Hi Carlos,
You probably want to create a new widget and override its label_from_instance
method.
class BModelMultipleChoiceField(forms.ModelMultipleChoiceField):
def label_from_instance(self, obj):
return "%s (%s)" % (obj, obj.count_a)
And then you'll want to change your queryset to annotate the count so you can
access it in the new field.
class AFilterForm(forms.Form):
to_b = BModelMultipleChoiceField(
widget=forms.CheckboxSelectMultiple(),
queryset = B.objects.all().annotate(count_a=Count('a_set')))
-----Original Message-----
From: django-users@googlegroups.com [mailto:django-users@googlegroups.com] On
Behalf Of Carlo Ascani
Sent: Friday, February 17, 2017 12:14 PM
To: django-users@googlegroups.com
Subject: Question about m2m and forms
Hi all,
I have a model A with a m2m to B:
------------------------------------------
class A(models.Model):
to_b = models.ManyToManyField(B)
class B(models.Model):
name = models.CharField(max_length=100)
------------------------------------------
In a view, I am listing A objects and I am building a form to use B as a filter.
------------------------------------------
class AFilterForm(forms.Form):
to_b = forms.ModelMultipleChoiceField(
widget=forms.CheckboxSelectMultiple(),
queryset = B.objects.all())
------------------------------------------
This is the view:
------------------------------------------
class AListViewWithFilter(ListView):
model = A
def get_context_data(self, **kwargs):
context = super(AListViewWithFilter, self).get_context_data(**kwargs)
qs = A.objects.all()
b_filter = None
if self.request.GET:
if 'to_b' in self.request.GET:
b_filter = self.request.GET.getlist('to_b')
res = res.filter(to_b__in=b_filter).distinct()
context.update({
'results': qs,
'form': AFilterForm(initial={
'to_b': b_filter
})
return context
------------------------------------------
Everything is working fine.
I would like to add a count of how many A objects are there for any of the
to_b. So that the filter form would look like this:
[ ] to_b_value_1 (34)
[ ] to_b_value_2 (12)
[ ] to_b_value_3 (3)
...
Is that possible?
Thank you in advance
Best,
Carlo
--
Carlo Ascani aka carloratm
Frontend Developer
www.carlorat.me
carloratm@freenode
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