如何使用属性字段Django对QuerySet进行排序

Question

I have a model as

class FooModel(models.Model):
    field_1 = models.IntegerField()
    field_2 = models.IntegerField()

    @property
    def field_sum(self):
        return self.field_1 + self.field_2

How can I sort the queryset with field_sum field?

FooModel.objects.all().order_by('field_sum') is giving me error. Thanks in advance

Answer 1

Use F() expression along with annotate() as below,

from django.db.models.expressions import F

FooModel.objects.