[Django]-Django Rest Framework – Nested Serializer are lazy loaded?

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Your problem comes from the queryset, not the serializer. By default Django querysets do not follow relations and so the related fields are not populated.
In order to fix that you have to change your queryset to use select_related for OneToOne and ForeignKey fields and prefetch_related for ManyToMany fields.

So lets say you are using DRF ViewSets, you can change your get_queryset method in the OrderViewSet to something like that:

def get_queryset(self):
    return Order.objects.select_related(
            'bought_by', 'category', 'article', 'supplier',
            'payment_method', 'delivery_received_by'
        ).prefetch_related(
            'tags', 'invoice_documents'
        )
👤Todor

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