Question

我在Django有一个项目，我正在使用mongoengine使用GridFSStorage将图像保存到Mongo数据库中。

到目前为止一切都还好，但问题是......当试图通过http请求检索图像时，使用django-tastypie-mongoengine制作的REST API，我得到了一个像这样的json对象：

{"file": "<GridFSProxy: 516ed7cf56ba7d01eb09f522>", "id": "516ed7cf56ba7d01eb09f524", "resource_uri": "/api/v1/pic/516ed7cf56ba7d01eb09f524/"}

有谁知道如何通过http请求从GridFS获取文件？

非常感谢！

Answer 1

您需要编写自己的视图，但您可以将其视为API的一部分。首先，观点：

def api_image(pk):
    obj = get_object_or_404(Model, pk=pk)
    image_file = obj.file
    return Response(image_file.read(),
        mime_type='image/png')  # or whatever the MIME type is

然后，您可以将其映射到urls.py：

   url('^/api/v1/pic/(?P<pk>\w+)/file/$', api_image)

并确保tastypie在输出中显示您想要的内容：

def dehydrate_file(self, bundle):
    return '/api/v1/pic/%s/file/' % (bundle.obj.id)

只需确保假API视图出现在实际API定义之前，您应该全部设置！

Answer 2

保罗的提示非常有用。在这里，我完全以tastypie方式实现了上传和下载图像。

你去..

<强> 1。压倒deseriazer以支持＆＃39; multipart＆＃39;

class MultipartResource(object):
def deserialize(self, request, data, format=None):
    if not format:
        format = request.META.get('CONTENT_TYPE', 'application/json')
    if format == 'application/x-www-form-urlencoded':
        return request.POST
    if format.startswith('multipart'):
        data = request.POST.copy()
        data.update(request.FILES)
        return data
    return super(MultipartResource, self).deserialize(request, data, format)

<强> 2。模型类

class Research(Document):
    user = ReferenceField(User)
    academic_year = StringField(max_length=20)
    subject = StringField(max_length=150)
    topic = StringField(max_length=50)
    pub_date = DateTimeField()
    authored = StringField(max_length=20)
    research_level = StringField(max_length=20)
    paper_presented = BooleanField()
    thesis_written = BooleanField()
    proof_image = ImageField()

第3。资源类

class ResearchResource(MultipartResource, MongoEngineResource):

class Meta:
    queryset = Research.objects.all()
    list_allowed_methods = ['get','post']
    resource_name = 'research'
    authentication = SessionAuthentication()
    authorization = Authorization()

def prepend_urls(self):
    return [
       url(r"^(?P<resource_name>%s)/$" % self._meta.resource_name,
            self.wrap_view('dispatch_list'), name="api_dispatch_list"),

       #url to download image file.
       url(r"^(?P<resource_name>%s)/(?P<pk>\w+)/file/$"% self._meta.resource_name,
            self.wrap_view('get_image'), name="api_get_image"),
    ]

#Preparing image url dynamically
def dehydrate_proof_image(self, bundle):
    return '/api/v1/%s/%s/file/' % (self._meta.resource_name,bundle.obj.id)

#view will call based on image url to download image.
def get_image(self, request, **kwargs):
    obj = Research.objects.get(id=kwargs['pk'])
    image_file = obj.proof_image
    return HttpResponse(image_file.read(), content_type="image/jpeg"))

希望这对将来的每个人都非常有用。：）

使用django-tastypie-mongoengine从GridFS中检索图像

2 个答案: