无法检查queryset是否为子集

I have three models

我有三个型号

class Permission(models.Model):
    permission = models.CharField(max_length=255, null=False)

class PermissionMap(models.Model):
    name = models.CharField(max_length=255, null=False)
    origin = models.ForeignKey(Origin)
    license  = models.ForeignKey(License)
    class Meta:
        unique_together = (("origin", "license"),)


class PermissionValidatorMap(models.Model):
    permission_map = models.ForeignKey(PermissionMap)
    permission = models.ForeignKey(Permission)
    validator_set = models.ManyToManyField(ValidatorMetaData)
    class Meta:
        unique_together = (("permission_map", "permission"),)
class Permissio