Django Serialization KeyError (Django Rest框架)

Question

我需要编写自定义的create方法来进行嵌套序列化，所以我有以下代码：

def create(self, validated_data):
    images = validated_data['commodity']['images']
    del validated_data['commodity']['images']
    commodity = Commodity.objects.create(**validated_data['commodity'])
    del validated_data['commodity']
    for image in images:
        CommodityImage.objects.create(commodity=commodity, **image)
    sizes = validated_data['outwear']['sizes']
    del validated_data['outwear']['sizes']
    clother = Clother.objects.create(commodity=commodity, **validated_data)
    outwear = Outwear.objects.create(clother=clother, **validated_data['outwear'])
    for size in sizes:
        outwear.sizes.add(size)
    return clother

大多数代码行都做得很好，并且创建了outwear实例，但是in不能将尺寸添加到outwear实例中，它的模型中有sizes作为ManyToMany字段，最后我得到了没有描述的KeyError ' sizes‘。我做错了什么？谢谢!

添加：

def create(self, validated_data):
    images = validated_data['commodity']['images']
    del validated_data['commodity']['images']
    commodity = Commodity.objects.create(**validated_data['commodity'])
    del validated_data['commodity']
    for image in images:
        CommodityImage.objects.create(commodity=commodity, **image)

    sizes = validated_data['outwear']['sizes']
    # del validated_data['outwear']['sizes']

    clother = Clother.objects.create(commodity=commodity, **validated_data)
    outwear_type = validated_data['outwear']['outwear_type']
    name = validated_data['outwear']['name']
    outwear = Outwear.objects.create(clother=clother, outwear_type=outwear_type, name=name)
    for size in sizes:
        outwear.sizes.add(size)
    return clother

这就解决了问题。看起来很奇怪，因为如果我再次尝试删除大小-我得到相同的‘大小’的问题。另外，我还有一个：

def __str__(self):
    return str(self.size)

作为我的大小方法(DecimalField)。

Answer 1

KeyError 'sizes‘在这一行

sizes = validated_data['outwear']['sizes']

看看validated_data，也许你需要看看尺码是否在外衣中？