在 m2m_changed 信号中迭代对象

编程问答 2022-06-02

问题描述

我有以下设置： 订单/models.py

class Order(models.Model):
    order_deliverer = models.ManyToManyField(Deliverer,related_name='deliverer')
    deliveringstatus = models.BooleanField(default=False)

order/signals.py

@receiver(m2m_changed,sender=Order.deliverer.through)
def m2m_changed_order_deliverer(sender,instance,**kwargs):
    if kwargs['action'] == 'post_add':
        instance.deliveringstatus = True
        instance.save()

#changes the order model's,on-delivery status to TRUE once an order_deliverer has been appended onto its ManyToManyField.

帐户/模型.py

class Deliverer(models.Model):
    user = models.OnetoOneField(User,on_delete=models.CASCADE,primary_key=True,related_name='deliverer')
    busy = models.BooleanField(default=False)

@receiver(m2m_changed,sender=Order.order_deliverer.through)
def m2m_changed_deliverer_profile(sender,**kwargs):
    if kwargs['action'] == 'post_add':
        #print(instance.order_deliverer.through.objects.all())
        obj = instance.order_deliverer.through.objects.last().deliverer
        obj.busy = True
        obj.save()
#alters the deliverer's profile status to busy.

1.我的问题是处理迭代。如果订单的 order_deliverer 字段有多个用户对象，则帐户信号仅在最后一个对象上处理。

2.我如何迭代和更改每个交付者的个人资料。

我正在考虑通过“for”循环，但我首先需要能够获取单个用户对象，而不是第一个或最后一个。

解决方法

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djangodjangodjango-signalsmanytomanyfieldpythonsignal-processing