如何使用 django rest api 上传多个文件？

Question

我正在尝试使用 django rest api 上传多张图片。我关注了以下approach。但是当我选择一个或多个文件并尝试将它们作为表单数据发送到服务器时，我收到以下错误消息：

AttributeError at /api/photo/ 'bytes' object has no attribute 'name'

型号：

class Photo(models.Model):
    image = models.ImageField(upload_to='audio_stories/')

序列化器：

class FileListSerializer ( serializers.Serializer ) :
    image = serializers.ListField(
                child=serializers.FileField( max_length=100000,
                                         allow_empty_file=False,
                                        use_url=False )
                                )
    def create(self, validated_data):
        image=validated_data.pop('image')
        for img in image:
            photo=Photo.objects.create(image=img,**validated_data)
        return photo

查看：

class PhotoViewSet(viewsets.ModelViewSet):
    serializer_class = FileListSerializer
    parser_classes = (MultiPartParser, FormParser,)
    queryset=Photo.objects.all()

网址

router.register('api/photo', PhotoViewSet, 'photocreate')

我不知道如何处理该错误，因为我的代码中没有与“名称”相关的内容？

Answer 1

错误似乎在序列化程序中。我必须设置use_url=True。

序列化器：

class FileListSerializer ( serializers.Serializer ) :
    image = serializers.ListField(
                child=serializers.FileField( max_length=100000,
                                         allow_empty_file=False,
                                        use_url=True )
                                )
    def create(self, validated_data):
        image=validated_data.pop('image')
        for img in image:
            photo=Photo.objects.create(image=img,**validated_data)
        return photo

扩展答案

上面的答案有效，但会产生一个大的空数组。 为了使代码工作，我必须在 Story 和 Story_Media 中分离我的两个模型。 Story Media 的每个实例都包含一个图像，并为 Story 提供 FK。

class Story (models.Model):
    title = models.CharField(max_length=100, blank=True)
    description = models.TextField(blank=True)
    date_posted = models.DateTimeField(default=timezone.now)

    def __str__(self):
        return f'{self.id} Story'

class Story_Media (models.Model):
    story = models.ForeignKey(Story,on_delete=models.CASCADE, null=True, related_name = 'story_media', related_query_name = 'story_media')
    file = models.FileField(upload_to='story_media/',  null=True, validators=[validate_file_extension_image])
    isTitlePicture = models.BooleanField(blank=False, null=True)

    def __str__(self):
        return f'{self.id} Media'

在我的序列化程序中，为传入数据中包含的每个图像创建一个新的 Sotry_Media 实例。就我而言，即使没有上传图片，也需要创建故事，因此包括两个条件。

# Story  Serializer_Media_Serializer
class Story_Media_Serializer (serializers.ModelSerializer):

    class Meta:
        model = Story_Media
        fields =  ('id','isTitlePicture', 'file',)


# Story  Serializer
class StoryCreateUpdateSerializer (serializers.ModelSerializer):
    story_media = Story_Media_Serializer(many=True, required = False)


    class Meta:
        model = Story
        fields =  ('title','description', )

    def create(self, validated_data):
        current_user = self.context["request"].user

        # Story  contains images
        if 'story_media' in validated_data:
            story_media = validated_data.pop('story_media')
            story_instance = Story.objects.create(author=current_user, **validated_data)
            for img in story_media:
                Story_Media.objects.create(**img, story=story_instance)
            return story_instance

        # Story  is not containing images
        if 'story_media'not in validated_data:
            story_instance = Story.objects.create(author=current_user, **validated_data)
            return story_instance

class StoryCreateUpdateViewSet(viewsets.ModelViewSet):
    serializer_class = StoryCreateUpdateSerializer

    http_method_names = ['post','delete','put','patch', 'head']

    queryset = Story.objects.all()

    permission_classes = [
        permissions.IsAuthenticated, PostOwnerPermssion
    ]

Answer 2

也许你应该考虑像我一样实施这对我有用

型号

class Photo(models.Model):
    title = models.CharField(max_length=255, blank=True)
    image = models.ImageField(upload_to='hotel_photos')
    hotel = models.ForeignKey(
        Hotels, on_delete=models.CASCADE, null=True, blank=True,)

    class Meta:
        verbose_name_plural = 'Photos'

    def __str__(self):
        """Prints the name of the Photo"""
        return f'{self.hotel} photos'

序列化器

class PhotoSerializer(ModelSerializer):
    class Meta:
        model = Photo
        fields = (
            "image",
            "hotel",
        )

辅助功能

def modify_input_for_multiple_files(hotel, image):
    dict = {}
    dict['hotel'] = hotel
    dict['image'] = image
    return dict

Views.py

class PhotoUploadView(ListCreateAPIView):
    """
    This API view handles multiple images upload form
    It will also display images for specific hotel
    """
    parser_classes = (MultiPartParser, FormParser)
    # http_method_names = ['get', 'post', 'head']

    def get(self, request):
        all_images = Photo.objects.all()
        permission_classes = (IsAdminOrOwner,)
        serializer_class = PhotoSerializer(all_images, many=True)
        return JsonResponse(serializer.data, safe=False)

    def post(self, request, *args, **kwargs):
        hotel = request.data.get('hotel')
        images = dict((request.data).lists())['image']
        flag = 1
        arr = []
        for img_name in images:
            modified_data = modify_input_for_multiple_files(hotel, img_name)
            file_serializer = PhotoSerializer(data=modified_data)

            if file_serializer.is_valid():
                file_serializer.save()
                arr.append(file_serializer.data)
            else:
                flag = 0

        if flag == 1:
            return Response(arr, status=status.HTTP_201_CREATED)
        else:
            return Response(arr, status=status.HTTP_400_BAD_REQUEST)

希望这可以帮助您或任何陷入困境的人。如有任何问题请拍下