Django reverse foreign key with prefetch related

django_reverse_fk.py

# models.py
class WareHouse(models.Model):
    address = models.CharField(max_length=255, null=True, unique=True)

    def __str__(self):
        return self.address

class Product(models.Model):
    article = models.CharField(max_length=255, null=True, unique=True)
    productwarehouse = models.ForeignKey(WareHouse, on_delete=models.CASCADE, null=True)

    def __str__(self):
        return self.article

# views.py
from .models import WareHouse
for warehouse in WareHouse.objects.prefetch_related('product_set').all():
    for product in warehouse.product_set.all():
        print(product.article)