Question

class c(models.Model):
    f = models.ManyToManyField(
        'self', 
        blank=True, 
        null=True, 
        related_name='child_set'
    )

I can do :

 c.objects.get(pk="1").f

But how do I get by ‘_set’?

 c.objects.get(pk="1").child_set

doesn’t work

i need this:

{name:A,parent:[]}
{name:B,parent:[A]}
{name:C,parent:[A,B]}

C.parent.all() == [A,B]
A.parent_set.all() == [B,C]

Answer 1

For ManyToManyFields that reference self, a reverse relationship is not created. This is because it has no use – it would contain all relations that refer to itself – which is what the forward relation does.

You’ll find regardless of what you say the related_name should be it will be set to %(field)s_rel_+ (the trailing + prevents the relation being created).

So the answer is there is no child_set because you can just use f.