如何查询集继承模型django？

Question

I have models

class Parent(Model):
    pass

class Child1(Parent):
    att1 = CharField()

class Child2(Parent):
    att2 = CharField()

class Final(Model):
    parent = ForeignKey('Parent', related_name="final")

I need to queryset

Final.objects.filter(parent__att1='abc')

But just Child1 inheritance Parent has att1 . How to queryset att1 in Child1 not Child2 ?

Answer 1

You can query with:

Final.objects.filter(='abc')

In Django model inheritance (of non-abstract models) is achieved by adding an implicit OneToOneField in the child model(s). We can thus use that relation by querying in reverse .

This will thus create a query that looks like:

SELECT final.*
FROM final
INNER JOIN parent ON final.parent_id = parent.id
INNER JOIN child1 ON 
WHERE child1.att1 = 'abc'