python - django rest framework 3 ImageField发送ajax结果 “No file was submitted.”

Question

我有一个带有 Django Rest Framework 的 API 端点来上传图像。你能发现我做错了什么吗？

#models.py

class test(models.Model):
    ...
    upload_path = 'upload/'
    image = models.ImageField(upload_to=upload_path, null=True, blank=True)
    ...

#serializers.py

class TestSerializer(serializers.ModelSerializer):
    image = serializers.ImageField(
        max_length=None, use_url=True,
    )
    class Meta:
        model = test
        fields = ('id','name','image',...)

#views.py

@api_view(['GET', 'POST'])
def test_list(request, site_id, block_id):

            ....

        if request.method == 'POST':
            serializer = TestSerializer(data=request.DATA)
            if serializer.is_valid():
                serializer.save()
                return Response(serializer.data, status=status.HTTP_201_CREATED)
            else:
                return Response(
                    serializer.errors, status=status.HTTP_400_BAD_REQUEST)
    else :
        return Response(status=status.HTTP_403_FORBIDDEN)

#js

function setimage() {
    var $input = $("#js_teaser_img");
    var fd = new FormData;

    fd.append('image', $input.prop('files')[0]);

    $.ajax({
        url: '/api/....',
        data: fd,
        processData: false,
        contentType: false,
        type: 'POST',
        success: function (data) {
            alert(data);
        }
    });
}

result image: ["No file was submitted."] 0: "No file was submitted."

结果

Django REST Framework upload image: "The submitted data was not a file"

+

var reader = new FileReader();  
        reader.onload = function(e) {
            var img_local = e.target.result;
            $('.js_img_src').attr('src', img_local);
            $.post('/api/..../7/', {'image':img_local} , function( data ) {
                console.log(data);
            });
        }
        reader.readAsDataURL(file);

Answer 1

为了从客户端发送文件，您应该使用“multipart/form-data”(jQuery 将 contentType 设置为“application/x- www-form-urlencoded"而不是默认)。阅读关于 SO 的这个问题:Sending multipart/formdata with jQuery.ajax

关于 python 和 django rest 框架，您应该在 API View 中使用 MultiPartParser 和/或 FileUploadParser 并且文件上传的首选方法应该是“ put”，正如您在此处的引用中所见:http://www.django-rest-framework.org/api-guide/parsers/#fileuploadparser .

附言。如果您使用 django rest 框架，我强烈建议您使用 Angular 而不是 jQuery，因为它为 rest 服务提供了出色的集成……相信我更好! ;)