I have a model with field:
class Product(models.Model):
subproducts = models.ManyToManyField("self", blank=True)
I need to overwrite admin's field queryset, to display only that objects
that don't belong to any m2m relation. I have no idea how to get them.
So if I have: product1, product2, product3, product4.
product1 contains in subproducts: product2
I need a query that will get, in that situation, product3 and product4
Any idea how to get that?
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