預期的字符串或緩衝區

Question

我想從我的模型獲得的相關圖像URL

class DetailSerializer(serializers.ModelSerializer): 
     image = serializers.SerializerMethodField("get_related_image_url")  
     etc 

    def get_related_image_url(self, obj): 

     request = self.context.get('request', None)   
     print(request.build_absolute_uri(obj.image())) 

錯誤：

預期字符串或緩衝區

/Users/user/Documents/workspace/demo/django-env/lib/python2.7/site-packages/django/http/request.py in build_absolute_uri 
     """ 
     Builds an absolute URI from the location and the variables available in 
     this request. If no location is specified, the absolute URI is built on 
     ``request.get_full_path()``. 
     """ 
     if not location: 
      location = self.get_full_path() 
     if not absolute_http_url_re.match(location): ... 
      current_uri = '%s://%s%s' % ('https' if self.is_secure() else 'http', 
             self.get_host(), self.path) 
      location = urljoin(current_uri, location) 
     return iri_to_uri(location) 
    def _is_secure(self): 

爲什麼我得到這個錯誤？

Answer 1

obj.image()似乎正在返回不是字符串的東西。