我需要在django中使用tastypie修补用户个人资料图片。我使用Django 1.6,AngularJs,它使用Django的普通Authentication()和DjangoAuthorization()类。
当我尝试使用'CONTENT-TYPE:Multipart / form-data'上传图像时。我收到以下错误。
error_message: "You cannot access body after reading from request's data stream"
首先,我知道Tastypie对多部分表单数据没有官方支持。我希望有一个猴子补丁或任何有效的东西,直到tastypie支持多部分数据。
我已对上述内容进行了一些研究,并调查了一些问题:
参考文献:
虽然上面的方法看起来像是一个黑客......我想在我的资源中尝试一下。
我的资源如下:
class UserProfileResource(ModelResource):
user = fields.ToOneField(UserResource, 'user', full=True)
profile_img = fields.FileField(attribute="img", null=True, blank=True)
"""docstring for ProfileResource"""
def alter_list_data_to_serialize(self, request, data):
if request.GET.get('meta_only'):
return {'meta': data['meta']}
return data
def authorized_read_list(self, object_list, bundle):
return object_list.filter(user=bundle.request.user).select_related()
def obj_create(self, bundle, **kwargs):
return super(UserProfileResource, self).obj_create(bundle, user=bundle.request.user)
def dehydrate(self, bundle):
bundle.data['groups'] = [g.name for g in bundle.request.user.groups.all()]
return bundle
"""Deserialize for multipart Data"""
def deserialize(self, request, data, format=None):
if format is None:
format = request.META.get('CONTENT_TYPE','application/json')
if format == 'application/x-www-form-urlencoded':
return request.POST
elif format.startswith('multipart'):
data = request.POST.copy()
data.update(request.FILES)
return data
return super(UserProfileResource, self).deserialize(request, data, format)
"""PATCH For Making the request._body = FALSE"""
def put_detail(self, request, **kwargs):
if request.META.get('CONTENT_TYPE').startswith('multipart') and \
not hasattr(request, '_body'):
request._body = ''
return super(UserProfileResource, self).put_detail(request, **kwargs)
"""PATCH for MAKING the request._body = FALSE"""
def convert_post_to_VERB(request, verb):
"""
Force Django to process the VERB. Monkey Patch for Multipart Data
"""
if request.method == verb:
if hasattr(request, '_post'):
del (request._post)
del (request._files)
request._body # now request._body is set
request._read_started = False # so it won't cause side effects
try:
request.method = "POST"
request._load_post_and_files()
request.method = verb
except AttributeError:
request.META['REQUEST_METHOD'] = 'POST'
request._load_post_and_files()
request.META['REQUEST_METHOD'] = verb
setattr(request, verb, request.POST)
return request
class Meta:
queryset = UserProfile.objects.filter()
resource_name = 'user_profile'
list_allowed_methods = ['get', 'post']
detail_allowed_methods = ['get', 'post', 'put', 'delete', 'patch']
serializer = Serializer()
authentication = Authentication()
authorization = DjangoAuthorization()
always_return_data = True
上面提到的参考文献说明 convert_post_to_VERB()方法不是为了处理Multipart数据,而是修补 request._read_started = False 。我们将能够使用tastypie上传文件。但是出于某种原因,即使在我完成上述补丁之后,我仍然会收到相同的“错误:从请求的数据流中读取后无法访问正文”。
请帮助我解决问题,我错过了什么?或者是否有人有一个工作逻辑,以便我可以举个例子。
更新:
答案 0 :(得分:4)
您需要定义patch_detail
而不是update_detail
这就是我的MultipartResource的样子:
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/form-data'):
multipart_data = request.POST.copy()
multipart_data.update(request.FILES)
return multipart_data
return super(MultipartResource, self).deserialize(request, data, format)
def put_detail(self, request, **kwargs):
if request.META.get('CONTENT_TYPE', '').startswith('multipart/form-data') and not hasattr(request, '_body'):
request._body = ''
return super(MultipartResource, self).put_detail(request, **kwargs)
def patch_detail(self, request, **kwargs):
if request.META.get('CONTENT_TYPE', '').startswith('multipart/form-data') and not hasattr(request, '_body'):
request._body = ''
return super(MultipartResource, self).patch_detail(request, **kwargs)
我在我的资源上使用ModelResource进行多重继承:
class MyResource(MultipartResource, ModelResource):
pass
顺便说一句,为您的资源设置convert_post_to_VERB
方法是没有意义的。不幸的是,在tastypie的Resource类中,这不是一种可以覆盖的方法。他们将其定义为resource.py模块中的一个函数。