如何在 Django 模型中为类中的多个变量分配相同的值答案

【问题标题】：How to assign the same value to multiple variables in a class in django models如何在 Django 模型中为类中的多个变量分配相同的值
【发布时间】：2022-01-02 02:26:25
【问题描述】：

在下面的类订单中，我想为金额分配相同的重量值

class Orders(models.Model):
    consignment_id = models.IntegerField(primary_key='consignment_id', auto_created=True)
    order_date = models.DateTimeField(default=timezone.now)
    weight = models.FloatField()
    from_place = models.CharField(max_length=20, null=True)
    destination = models.CharField(max_length=20)
    amount = models.FloatField(weight)
    name = models.ForeignKey(User, on_delete=models.CASCADE)
    status = models.CharField(max_length=20, default='Pending')

【问题讨论】：

标签： python django

【解决方案1】：

你应该在模型中使用保存功能

class Orders(models.Model):
    consignment_id = models.IntegerField(primary_key='consignment_id', auto_created=True)
    order_date = models.DateTimeField(default=timezone.now)
    weight = models.FloatField()
    from_place = models.CharField(max_length=20, null=True)
    destination = models.CharField(max_length=20)
    amount = models.FloatField()
    name = models.ForeignKey(User, on_delete=models.CASCADE)
    status = models.CharField(max_length=20, default='Pending')

    def save(self):
        self.amount = self.weight
        super().save(self)

【讨论】：