Django REST framework: Can a nested object access its parent object's details in a List View?

Question

I am attempting to implement a nested resource where one of its fields depends on a value from its parent resource.

Suppose we are building a system for a company which

Answer 1

In addition to the accepted answer, if you use viewsets and want your sub-resource to be a collection (filtered by the parent document) only, you can also use the @detail_route decorator, as documented in the docs:

from rest_framework import viewsets
from rest_framework.decorators import detail_route
from rest_framework.response import Response

class CustomerViewSet(viewsets.ModelViewSet):
    queryset = Customer.objects.all()
    serializer_class = CustomerSummarySerializer

    ...

    @detail_route(methods=['get'])
    def rep(self, request, pk=None):
        customer = self.get_object()
        queryset = customer.pk.all()
        instances = self.filter_queryset(queryset)
        serializer = RepSummarySerializer(instances,
                context={'request': request}, many=True)
        return Response(serializer.data)

Now you can query /customers/123/rep/ and you will get a list of all Rep instances for the specified customer.

It probably won't fully solve what you need, but for many people that don't need full nested resources it's actually enough.