Django Order By 查询模型中的方法

Question

我有这个型号：

class User(models.Model):
  uid = models.AutoField(primary_key=True)
  email = models.EmailField(max_length=200, unique=True)
  password = models.CharField(max_length=200)
  name = models.CharField(max_length=200, default='')
  contact = models.CharField(max_length=10)
  cash_amount = models.IntegerField(default=25000)
  share_amount = models.IntegerField(default=0)
  def __str__(self):
    return self.email
  def total_amount(self):
    return self.cash_amount + self.share_amount

如何根据 total_amount() 编写 QuerySet 对结果进行排序，我尝试了以下查询：

User.objects.order_by('total_amount()')

但是 FieldError: Invalid order_by arguments: ['total_amount()'] comes.

是否有任何其他方法可以编写查询以根据 cash_amount + share_amount 对结果进行排序而不创建 total_amount().

Answer 1

您可以尝试使用 extra

User.objects.extra(
    select={'field_sum' : 'cash_amount + share_amount'},
    order_by=('field_sum',)
)

Django Order By 查询模型中的方法

Django Order By Query on Methods in Models

django

django-models

django-queryset