为什么django-celery任务显示“属性错误”?

当我运行下面的代码时,Django抛出了一个包装错误,错误代码如下所示

错误消息:

attributeError:'method wrapper'对象没有属性' 模块 ’

Models.py
class PatientMasters(models.Model):
    patient_id = models.AutoField(primary_key=True)
    patient_n_key = models.CharField(max_length=15, blank=True, unique=True)
    centre_master_short_name = models.CharField(blank=False, max_length=33)
    centre_master_id = models.CharField(blank=False, max_length=15)
    pid_no = models.CharField(max_length=45, blank=True, null=True)
    aadhar_number = models.CharField(max_length=45, blank=True, null=True)
    date_of_registration = models.BigIntegerField()
    patient_name = models.CharField(max_length=45,blank=False)
    gender = models.CharField(max_length=45,blank=False)
    patient_category = models.CharField(max_length=45, blank=True, null=True)
    age = models.IntegerField(blank=False)
    class Meta:
        managed = False
        db_table = 'patient_masters'

@receiver(post_save, sender=PatientMasters)
def generate_pat_unique_key(sender, instance, created, **kwargs):
   """
       Generate unique n_key as an combination of primary key and centre_master_id
   """
   post_save.disconnect(generate_pat_unique_key, sender=PatientMasters)
   instance.patient_n_key = "{}-pat-{}".format(instance.centre_master_short_name, instance.patient_id)
   instance.save()
   post_save.connect(generate_pat_unique_key, sender=PatientMasters)


Views.py

class PatientMastersviewset(viewsets.ModelViewSet):
    queryset=models.PatientMasters.objects.all()
    serializer_class=serializers1.PatientMastersserializer
    lookup_field = 'patient_n_key'
    tasks.PatientMastersviewset.delay()


tasks.py
@app.task
class PatientMastersviewset(viewsets.ModelViewSet):
    queryset=models.PatientMasters.objects.all()
    serializer_class=serializers1.PatientMastersserializer
    lookup_field = 'patient_n_key'