我正在使用DRF Writable Nested创建可写的嵌套序列化器。
我需要验证“ ItemDetail”,但它需要父序列化程序中存在的“ product_id”,即“ InvoiceItem”。
模型
class InvoiceItem(models.Model):
product = models.ForeignKey(
Product, on_delete=models.CASCADE, related_name="invoice_items"
)
class ItemDetail(models.Model):
invoice_item = models.ForeignKey(
InvoiceItem, on_delete=models.CASCADE, related_name="item_details"
)
size = models.ForeignKey(
Size, on_delete=models.CASCADE, related_name="item_details"
)
quantity = models.PositiveIntegerField()
序列化器
class InvoiceItemSerializer(WritableNestedModelSerializer):
product = ProductMiniSerializer(read_only=True)
product_id = serializers.IntegerField(write_only=True)
item_details = ItemDetailSerializer(many=True)
class Meta:
model = InvoiceItem
fields = [
"id",
"product_id",
"product",
"item_details",
]
class ItemDetailSerializer(serializers.ModelSerializer):
class Meta:
model = ItemDetail
fields = [
"id",
"size",
"quantity",
]
def validate(self, data):
return item_detail_validate(self, data)
验证者
def item_detail_validate(self, data):
# How to get product_id here so I can use it in a query
return data
答案 0 :(得分:2)
访问序列化程序的父项的initial_data
属性,
def validate(self, data):
product_id = self.parent.initial_data['product_id']
return item_detail_validate(self, data)
答案 1 :(得分:0)
这有点晚了,但对于来到这里的其他人,在处理 many=True
def validate(self, data):
product_id = self.parent.parent.initial_data['product_id']
return item_detail_validate(self, data)
通常在进行相关引用时,self.parent.initial_data
可以从父序列化程序中获取数据。但是,当我们使用 many=True
时,DRF 会隐式调用 ListSerializer
。它将子序列化器传递给 ListSerializer
,然后将其传递给父序列化器
参考:https://www.django-rest-framework.org/api-guide/serializers/#listserializer