Django ORM - 使用模型的 ManyToManyField 更新 ForeignKey 字段

Question

I have a model:

class User(AbstractUser):
   name = models.CharField(max_length=255)
   organizations = models.ManyToManyField(Organization)
   active_organization = models.ForeignKey(Organization)

Now I want to update active_organization with one of the organizations within the model, so I want to do something like this:

User.objects.filter(active_organization=q).update(active_organization=F('organizations__pk')[0]) 

sadly F is not subscriptable, I've also tried,

User.objects.filter(active_organization=q)\
                    .update(active_organization=Subquery(
                    Organization.objects.filter(pk=OuterRef('organizations').all()[0].pk)))

But in this case it tells me the OuterRef should be inside a SubQuery which it is, so I'm completely at a loss here how this should be approached.

Answer 1

Try using the annotate create a field to then use in the update statement.

User.objects.filter(active_organization=q).annotate(
    next_active_org_id=Subquery(
        Organization.objects.filter(
            user_set__id=OuterRef('pk')
        ).values('id')[:1]
    )
).update(active_organization=F('next_active_org_id'))