尝试使用父级中子模型的属性进行制图

问题描述

我正在尝试使用order_total属性，将django管理员变更列表中某个孩子的订单项相加。 order_total属性在我的列表视图中正确显示，但在图表功能中不起作用。我在做什么错了？

models.py

    class Order(models.Model):
    class Meta:
        ordering = ['date_needed']

    date_ordered = models.DateField(blank=True,null=True,default=datetime.Now)
    date_needed = models.DateField(blank=True,default=datetime.Now)
    date_shipped = models.DateField(blank=True,null=True)
    customer = models.ForeignKey(Customer,on_delete=models.CASCADE,related_name='orders')
    customer_order = models.CharField(max_length=100,blank=True,null=True)
    status = models.ForeignKey(Order_Status,on_delete=models.CASCADE)
    invoice_no = models.CharField(max_length=45,null=True)
    tracking_no = models.CharField(max_length=45,null=True)
    shipping_cost =models.DecimalField(max_digits=10,decimal_places=2,null=True)
    carrier = models.CharField(max_length=50,null=True)
    service = models.CharField(max_length=100,null=True)
    

    @property
    def order_total(self):
        l = []
        for item in self.order_items.all():
            p = self.customer.pricings.filter(offering=item.offering).first().price if self.customer.pricings.filter(offering=item.offering).first() is not None else item.offering.wholesale_price,l.append(p[0] * item.lbs)
        return sum(l)



**admin.py**
    class OrderAdmin(admin.ModelAdmin):
    inlines = [OrderItemInline]
    list_display = ['customer','order_number','order_total','date_ordered','status']
    ordering = ['-date_ordered']

    def changelist_view(self,request,extra_context=None):
        response = super(OrderAdmin,self).changelist_view(request,extra_context)
        filtered_query_set = response.context_data["cl"].queryset
        
        chart_data = (
            filtered_query_set.annotate(date=TruncDay("date_ordered"),month=ExtractMonth('date_ordered'))
            .values("date",'month')
            .annotate(y=sum("order_total"))
            .order_by("-date_ordered")
        )

解决方法

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django properties properties python