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我有以下用例。我希望能够拥有一个包含许多文件的项目，因此我创建了一个模型来存储文件和另一个模型来存储项目，例如，您还可以将图像上传到Item：

models.py

class File(models.Model):
    """Class to represent a file."""

    name = models.TextField()

    file = models.FileField(upload_to='item_attachments/%Y/%m/%d/')

    item = models.ForeignKey("Item", on_delete=models.CASCADE, related_name='attachments', null=True)

    added_on = models.DateTimeField(auto_now_add=True)
    

class Item(models.Model):
    """Class to represent an item..."""

    label = models.TextField(null=True)

    photo = models.ImageField(null=True, upload_to='item_images/%Y/%m/%d/')

    name = models.TextField()

然后我创建我的序列化程序：

serializers.py

class FileSerializer(serializers.ModelSerializer):
    """Serializer for File."""

    class Meta: # pylint: disable=too-few-public-methods
        """Class to represent metadata of the object."""
        model = File
        fields = [ 'id', 'name', 'file', 'added_on', 'item' ]

class ItemSerializer(serializers.ModelSerializer):
    """Serializer for Item."""

    attachments = FileSerializer(
                            many=True,
                            allow_null=True,
                            required = False
                        )

    class Meta: # pylint: disable=too-few-public-methods
        """Class to represent metadata of the object."""
        model = Item
        fields = [  'id', 'label', 'photo', 'name', 'attachments']
        read_only_fields = ['id']

    def create(self, validated_data):
        obj = Item.objects.create(**validated_data)
        print(self)
        print(validated_data)
        return obj

最后我创建了 REST 端点：

views.py


class FileViewset(viewsets.ModelViewSet): # pylint: disable=too-many-ancestors
    """API Endpoint to return the list of categories"""
    queryset = File.objects.all()
    serializer_class = FileSerializer
    pagination_class = None

class ItemViewset(viewsets.ModelViewSet): # pylint: disable=too-many-ancestors
    """API Endpoint to return the list of items"""
    queryset = Item.objects.all()
    serializer_class = ItemSerializer

我可以做一个 POST，FileViewset它工作得很好： post_file

如果我尝试POST使用附件执行该项目，它不起作用，它会为附件留下一个空数组： 项目查询 所以经过一些研究，我认为我必须覆盖该create方法。但是当我尝试执行该步骤时，我的问题就来了。print(validated_data)如果我像以前那样打印。我看不到attachments我在查询中发送的内容。

如果我打印print(self)变量，我会看到附件以与图像类似的方式进入服务器，但不知何故它在数据验证中丢失了。

我该怎么做才能通过验证？

要添加更多信息，这是 self 打印的内容：

ItemSerializer(context={'request': <rest_framework.request.Request: POST '/api/v1/item/'>, 'format': None, 'view': <inventory.views.ItemViewset object>}, data=<QueryDict: {'label': ['00000003'], 'name': ['HDMI Cable Delete me'], 'photo': [<InMemoryUploadedFile: example.png (image/png)>], 'attachments': [<InMemoryUploadedFile: example.png (image/png)>]}>):
...
...
attachments = FileSerializer(allow_null=True, many=True, required=False):
        id = IntegerField(label='ID', read_only=True)
        name = CharField(style={'base_template': 'textarea.html'})
        file = FileField(max_length=100)
        added_on = DateTimeField(read_only=True)
        item = PrimaryKeyRelatedField(allow_null=True, queryset=Item.objects.all(), required=False)
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