Re: Question about m2m and forms

Il giorno sabato 18 febbraio 2017 11:02:25 UTC+1, Carlo Ascani ha scritto:

Il giorno venerdì 17 febbraio 2017 20:09:15 UTC+1, Matthew Pava ha scritto:

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')))

 Thank you!

That works really well.

The next step to this is would be to put the count in a separate property, so I can render it independently in the template (in a span, for example)

is that possible ?

Thank you in advance

Carlo

 

 

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