基于多重关系计算对象

Question

我有三个模型；

class User(AbstractUser):
    id = UUIDField(primary_key=True, default=uuid.uuid4, editable=False)

class UserProfile(Model):
    id = UUIDField(primary_key=True, editable=False)
    user = OneToOneField(User, CASCADE)
    subscription = CharField(max_length=250, null=True, blank=True)

class Image(Model):
    id = UUIDField(primary_key=True, editable=False)
    owner = ForeignKey(User, on_delete=CASCADE, null=True)

我想计算所有者订阅不等于字符串的所有图像对象（例如 'free'）。这可能吗？

Answer 1

您需要使用 lookup that spans relationships。

image_count = Image.objects.exclude(owner__userprofile__subscription='free').count()

基于多重关系计算对象

Counting objects based on multiple relationships

python

django

django-models

django-orm