Django Rest Framework filtering calculated model property

Question

Sorry for a newbie question. I have a following model:

class WeightSlip(models.Model):

    grossdate = models.DateTimeField(auto_now=False, auto_now_add=False)
         


        

Answer 1

Note that if you're using the latest version of django-filter, Filter.method takes 4 arguments, like so:

def filter_slipdate(self, queryset, name, value):
    if value:
        queryset = queryset.annotate(slipdate=Case(When(grossdate__gt=F('taredate'), then=F('grossdate')), default=F('taredate')).filter(slipdate=value)
    return queryset

```