小编Ama*_*dhu的帖子

抱歉新手问题.我有以下型号:

    class WeightSlip(models.Model):

        grossdate = models.DateTimeField(auto_now=False, auto_now_add=False)
        grossweight = models.DecimalField(max_digits=6, decimal_places=2, default=0)
        taredate = models.DateTimeField(auto_now=False, auto_now_add=False)
        tareweight = models.DecimalField(max_digits=6, decimal_places=2, default=0)
        vehicle = models.CharField(max_length=12)

        @property
        def netweight(self):
            return self.grossweight - self.tareweight

        @property
        def slipdate(self):
            if self.grossdate > self.taredate:
               return grossdate.date()
            else:
               return taredate.date()

串行:

    class WeightSlipSerializer(serializers.ModelSerializer):

       class Meta:
          model = models.WeightSlip
          fields = ('grossdate', 'grossweight', 'taredate', 'tareweight', 'slipdate', 'netweight', 'vehicle')
          read_only_fields = ('slipdate', 'netweight')

我正在尝试使用django-rest-framework-filters来过滤计算出的'netweight'和'slipdate'属性:

    class WeightSlipFilter(FilterSet):

       class Meta:
           model = WeightSlip
           fields = ('slipdate', 'netweight', 'vehicle')

这给了我一个错误: …