Django序列化KeyError（Django Rest框架）

Question

我需要编写自定义qazxsw poi方法来进行嵌套序列化，所以我有这个：

create

大多数线条做精美和外套实例创建，但在无法添加尺寸的外套实例，其中

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

作为sizes字段在它的模型，最后我得到KeyError'尺寸'没有描述。我究竟做错了什么？谢谢！

添加：

ManyToMany

这解决了这个问题。看起来很奇怪，因为如果我再次尝试删除尺寸 - 我会得到相同的“尺寸”问题。我也有：

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

作为我的大小方法（DecimalField）。

Answer 1

KeyError'sizes'在此行中

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

检查validated_data，也许你需要看看尺码是否穿着外套？