[Answered ]-Django RF. how to get a Django Model with nested relationship

It is possible to pass an instance directly to a serializer like this (as specified in the DRF documentation):

from some_app.serializers import FooSerializer

class FooTest(TestCase):

  def setUp(self):
    self.client = APIClient()

  def test_foo_feature(self):
    foo_id = generator.generateFoo().id
    foo = Foo.objects.get(id=foo_id)
    serialized_data = FooSerializer(foo).data