[Answered ]-How add non model field to django filters

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In django-filter you can specify keyword argument named as method inside field which accepts either a callable or the name of a method so you camodify you ProductFilter like this

class ProductFilter(django_filters.FilterSet):
    CHOICE = {
        ('True', 'previously purchased'),
        ('False', 'all')
    }
    name = django_filters.CharFilter()
    previously_purchased = django_filters.ChoiceFilter(
                             choices=CHOICE,
                             method='filter_previously_purchased',
                           )
    def filter_previously_purchased(self, queryset, name, value):
        if value == 'True':
            transactions = Transaction.objects.filter(user_id=self.request.user).values_list('product_id')
            queryset = queryset.filter(pk__in=[q[0] for q in transactions])
        return queryset
    
    class Meta:
        model = Product
        fields = ['name', 'previously_purchased',]

In above code I’ve added your show_products() logic inside filter_previously_purchased function with which takes these arguments

  • queryset It is queryset of specified model eg. Product.objects.all()
  • name it’s a field name eg. previously_purchased
  • value it’s value which comes from client.
👤Ankit Tiwari

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