python之DRF(django-rest-framework)中，AttributeError 'str' object has no attribute '~~' 如何解决

我正在使用 DRF 并出现 AttributeError 'str' object has no attribute '~~'。

我的错误页面和代码

Environment: 
 
 
Request Method: GET 
Request URL: http://127.0.0.1:8000/blog/ 
 
Django Version: 1.9.7 
Python Version: 3.5.2 
Installed Applications: 
['django.contrib.admin', 
 'django.contrib.auth', 
 'django.contrib.contenttypes', 
 'django.contrib.sessions', 
 'django.contrib.messages', 
 'django.contrib.staticfiles', 
 'django.contrib.gis', 
 'blog', 
 'account', 
 'taggit', 
 'friendship', 
 'rest_framework'] 
Installed Middleware: 
['django.middleware.security.SecurityMiddleware', 
 'django.contrib.sessions.middleware.SessionMiddleware', 
 'django.middleware.common.CommonMiddleware', 
 'django.middleware.csrf.CsrfViewMiddleware', 
 'django.contrib.auth.middleware.AuthenticationMiddleware', 
 'django.contrib.auth.middleware.SessionAuthenticationMiddleware', 
 'django.contrib.messages.middleware.MessageMiddleware', 
 'django.middleware.clickjacking.XFrameOptionsMiddleware'] 
 
 
 
Traceback: 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response 
  149.                     response = self.process_exception_by_middleware(e, request) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/django/core/handlers/base.py" in get_response 
  147.                     response = wrapped_callback(request, *callback_args, **callback_kwargs) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/django/views/decorators/csrf.py" in wrapped_view 
  58.         return view_func(*args, **kwargs) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/django/views/generic/base.py" in view 
  68.             return self.dispatch(request, *args, **kwargs) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/views.py" in dispatch 
  466.             response = self.handle_exception(exc) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/views.py" in dispatch 
  463.             response = handler(request, *args, **kwargs) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/decorators.py" in handler 
  52.             return func(*args, **kwargs) 
 
File "/home/keepair/djangogirls/blog/views.py" in post_list 
  37.         return Response(serializer.data) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/serializers.py" in data 
  700.         ret = super(ListSerializer, self).data 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/serializers.py" in data 
  239.                 self._data = self.to_representation(self.instance) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/serializers.py" in to_representation 
  618.             self.child.to_representation(item) for item in iterable 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/serializers.py" in <listcomp> 
  618.             self.child.to_representation(item) for item in iterable 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/serializers.py" in to_representation 
  463.                 attribute = field.get_attribute(instance) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/relations.py" in get_attribute 
  157.         return get_attribute(instance, self.source_attrs) 
 
File "/home/keepair/djangogirls/myvenv/lib/python3.5/site-packages/rest_framework/fields.py" in get_attribute 
  83.                 instance = getattr(instance, attr) 
 
Exception Type: AttributeError at /blog/ 
Exception Value: 'str' object has no attribute 'author' 

我想知道如何制作 serializers.py 代码。

我已经学习了:http://www.django-rest-framework.org/api-guide/relations/

但是我不明白我应该做什么。我应该把 serializers.py 放在哪里？ 以及如何制作我的序列化程序代码？或者 models.ForienKey 在使用 DRF 时不可用？

博客/views.py

@api_view(['GET']) 
def post_list(request, format=None): 
    """ 
    List all snippets, or create a new snippet. 
    """ 
    if request.method == 'GET': 
        lat = request.POST.get('user_lat', '13') 
        lon = request.POST.get('user_lon', '15') 
        userpoint = GEOSGeometry('POINT(' + lat + ' ' + lon + ')', srid=4326) 
        i=1 
 
        while i: 
            list_i = Post.objects.filter(point__distance_lte = (userpoint, D(km=i))) 
            list_total = str(',' + ' list_i') 
            post_list = list(chain(list_total)) 
            if len(post_list) >= 0 : 
                break 
 
        serializer = PostSerializer(post_list, many=True) 
        return Response(serializer.data) 

请您参考如下方法:

这与您的序列化程序或您放置它的位置无关。错误回溯告诉您错误发生在 View 中。

因此，在您的 post_list View 中，您构建了一个由字符串列表填充的列表(也称为 post_list)。然后您尝试将其放入 PostSerializer，这当然需要一个 Posts 查询集。

我不确定列表的意义是什么；似乎您应该将 Posts 直接传递给序列化程序。