我正在将Django REST framework用于API和带有Restangular的Angular SPA与API进行通信。有时,我必须使用API添加多个对象,我想可以将它们一起发送到一个数组中,并在一个请求中执行此操作。
我尝试从REST框架Web界面添加多个对象时收到wrong input
错误。我正在传递对象或对象数组,如下所示:
// this { "text": "gdhg", },{ "text": "gdhg", },{ "text": "gdhg", }
// or this [{ "text": "gdhg", },{ "text": "gdhg", },{ "text": "gdhg", }]
但是我收到ParseError。我在哪里做错了,我必须更改以解决此问题?
另一个支持发布数组以及发布单个对象的示例。对于寻找此类示例的其他人可能很有用。
class BookViewSet(mixins.CreateModelMixin, mixins.ListModelMixin, viewsets.GenericViewSet):
"""
ViewSet create and list books
Usage single : POST
{
"name":"Killing Floor: A Jack Reacher Novel",
"author":"Lee Child"
}
Usage array : POST
[{
"name":"Mr. Mercedes: A Novel (The Bill Hodges Trilogy)",
"author":"Stephen King"
},{
"name":"Killing Floor: A Jack Reacher Novel",
"author":"Lee Child"
}]
"""
queryset = Book.objects.all()
serializer_class = BookSerializer
search_fields = ('name','author')
def create(self, request, *args, **kwargs):
"""
#checks if post request data is an array initializes serializer with many=True
else executes default CreateModelMixin.create function
"""
is_many = isinstance(request.data, list)
if not is_many:
return super(BookViewSet, self).create(request, *args, **kwargs)
else:
serializer = self.get_serializer(data=request.data, many=True)
serializer.is_valid(raise_exception=True)
self.perform_create(serializer)
headers = self.get_success_headers(serializer.data)
return Response(serializer.data, status=status.HTTP_201_CREATED, headers=headers)
我不确定问题是否仍然存在。但是fiver建议的解决方案对我不起作用。对我有用的是仅重写get_serializer
方法。
def get_serializer(self, instance=None, data=None, files=None, many=True, partial=False): return super(ViewName, self).get_serializer(instance, data, files, many, partial)
如果您会注意到我在many=True
的参数中设置了默认的get_serializer
。除此之外,不需要任何操作。也不需要覆盖create方法。
此外,如果要在视图中定义pre_save和post_save方法,则期望列表(可迭代)作为方法的参数(在发布列表时),而不仅仅是单个对象。
def post_save(self, objects, *args, **kwargs): """ In the post_save, list of obj has been created """ for obj in objects: do_something_with(obj)
这是使用Django REST框架在ListCreateAPIView中设置批量POST的示例:
class SomethingList(generics.ListCreateAPIView):
model = Something
serializer_class = SomethingSerializer
def create(self, request, *args, **kwargs):
serializer = self.get_serializer(data=request.DATA, many=True)
if serializer.is_valid():
serializer.save()
headers = self.get_success_headers(serializer.data)
return Response(serializer.data, status=status.HTTP_201_CREATED,
headers=headers)
return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
这里的重要部分是many=True
方法的get_serializer()
参数。然后,为了使Angular更好玩,您可以将服务工厂定义为:
.factory('Something', ['$resource', function ($resource) {
return $resource(
"url_to_something",
{},
{
save: {
method: 'POST',
isArray: true
}
}
);
}])
重要的部分是isArray: true
。如果要保留发布单个JSON对象,可以将上面的save
更改为saveBulk
或类似内容。
class ListableViewMixin(object):
def get_serializer(self, instance=None, data=None, many=False, *args, **kwargs):
return super(ListableViewMixin, self).get_serializer(
instance=instance, data=data, many=isinstance(instance, list) or isinstance(data, list),
*args, **kwargs)
使您的视图继承自这个mixin类,以自动确定是否应使用many=True
序列化器。