Django 3.0：django-notifications给出错误：“ Notification.recipient”必须是“ User”实例

问题描述

我正在使用django-notifications-hq软件包link of django-notifications-hq并收到错误消息：

无法分配“ ”： “ Notification.recipient”必须是“ User”实例。

我的自定义user模型：

class User(AbstractBaseUser):
    email = models.EmailField(max_length=255,unique=True)
    name = models.CharField(max_length=255,blank=True,null=True)
    staff = models.BooleanField(default=False)
    admin = models.BooleanField(default=False)
    customer = models.BooleanField(default=False)
    seller = models.BooleanField(default=False)
    timestamp = models.DateTimeField(auto_now_add=True)
    is_active = models.BooleanField(default=True)

我的seller模型与user具有1to1关系：

class Seller(models.Model):
    user = models.OneToOneField(settings.AUTH_USER_MODEL,on_delete=models.CASCADE)
    seller_picture = models.ImageField(upload_to='profile_pic/seller',null=True,blank=True)

我的Book模型具有外键seller：

class Book(models.Model):
    id = models.UUIDField(primary_key=True,default=uuid.uuid4,editable=False)
    title = models.CharField('Title',max_length=255)
    authors = models.ManyToManyField(Author,related_name='book_written_by')
    seller = models.ForeignKey(Seller,on_delete=models.CASCADE)
    price = models.DecimalField('Price',decimal_places=2,max_digits=10)
    description = models.TextField('Description')

在成功获取某用户刚刚购买的views后，在我books的某个地方，我想通知所有sellers有人买了书：

for book in books:
     notify.send(Seller,recipient=book.seller,verb="User has just bought book named {} priced 
                                                             as {}".format(book.title,book.price))

我知道它可以正常使用recipient = request.user，但是我有不同的情况。如何使book.seller成为User实例？

解决方法

这是一个超级简单的解决方案。您已经99％到达那里！

代替此：

for book in books:
     notify.send(Seller,recipient=book.seller,verb="User has just bought book named {} priced 
                                                             as {}".format(book.title,book.price))

尝试一下：

for book in books:
     notify.send(book.seller.user,recipient=book.seller.user,book.price))

Seller具有一个名为user的属性，但它本身不是user。