Question

我目前正在开发一个结算应用程序并要求在账单中包含订单，因为我有以下两种型号的Bill和订单

 class Bill(Document):
    billNo = IntField(unique=True, blank=False)
    table = ReferenceField('Table',reverse_delete_rule=1)
    orders = EmbeddedDocumentListField('Order', required = False)
    total = models.FloatField()
    discount = models.FloatField(blank=True)
    grandtotal = models.FloatField()
    payment_option =  ReferenceField('PaymentOption',reverse_delete_rule=1)
    paid = models.BooleanField(default=False)

class Order(EmbeddedDocument):
   food = ReferenceField(Food)
   quantity = IntField(required = True)
   complementory = BooleanField(default = False)

和他们的序列化器一样

class OrderSerializer(EmbeddedDocumentSerializer):
   class Meta:
      model = Order
      fields = 'all'
      read_only_fields = ('id',)

class BillSerializer(DocumentSerializer):
   orders = OrderSerializer(many = True)
   class Meta:
       model = Bill
       fields = '__all__'
       read_only_fields = ('id',)

  def create(self, validated_data):
      orders = validated_data.pop('orders')
      bill = Bill.objects.create(**validated_data)
      bill.orders = []

      for order in orders:
          print(order)
          bill.orders.append(order)
      bill.save()
      return bill

但每当我传递一个类似

的json

{
"billNo": "4",
"table":"5a93eb7f59951a3320a0b4d8",
"payment_option":"5a93eddf59951a2fd4dbabe9",
"orders":[{
 "food":"5a93c2c759951a018c5e18b5",
 "quantity":"2",
 "complementory":"False"
}]
}

已创建帐单对象但未添加订单并且它会给出错误

mongoengine.errors.ValidationError: ValidationError           (Bill:5a94f76859951a19d4688aeb) 
(Invalid embedded document instance provided to an EmbeddedDocumentField: ['orders'])

我正在使用django rest框架，因为它是mongodb我正在使用django rest framework mongo引擎。什么是实际错误，我该怎么办？

Answer 1

我能够通过更改下面的Bill Serializer来实现它的工作

class BillSerializer(DocumentSerializer):
    orders = OrderSerializer(many = True)

    class Meta:
        model = Bill
        fields = '__all__'
        read_only_fields = ('id',)

    def create(self, validated_data):
        orders = validated_data.pop('orders')
        bill = Bill.objects.create(**validated_data)
        bill.orders = []    

        for order in orders:
            bill.orders.append(Order(**order))


        bill.save()

        return bill

提供给EmbeddedDocumentField的嵌入式文档实例无效

1 个答案: