Django Rest Framework:序列化程序响应错误
Posted
技术标签:
【中文标题】Django Rest Framework:序列化程序响应错误【英文标题】:Django Rest Framework: serializer response error 【发布时间】:2019-05-23 11:33:52 【问题描述】:我在 DRF 中的视图集有问题:
def get_queryset(self):
"""
:return: filtered queryset based on request query_param
"""
# todo#amedeo: improve the readability code
qs = super(ChecklistViewSet, self).get_queryset()
_pk = self.kwargs['pk']
if self.request.method == 'PUT':
instance = qs.filter(pk=int(_pk)).first()
# pass in the instance we want to update
serializer = ChecklistSerializer(instance, self.request.data)
# validate and update
if serializer.is_valid():
serializer.save()
serializer_dict = serializer.data
serializer_dict["message"] = "Checklist updated successfully."
return response.Response(serializer_dict, status=status.HTTP_200_OK)
else:
return response.Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
在我的代码中保存了 objetc,但响应给出了一个错误:
AttributeError:“响应”对象没有属性“模型”
我的序列化器是:
class ChecklistSerializer(serializers.ModelSerializer):
class Meta:
model = Checklist
fields = ('id', 'approved_by', 'role', 'hardship_classification',
'total_capacity', 'capacity_for_residents', 'checklist_type',
'state', 'pdf', 'submitting_afp', 'disabled', 'location')
我通过传递 json 的客户端 PUT 方法调用:
"approved_by": "Test",
"role": "test_role_4",
"hardship_classification": "test_6",
"total_capacity": "50",
"capacity_for_residents": "350",
"checklist_type": "permanent",
"state": "qcl_draft",
"pdf": null,
"submitting_afp": 3999,
"disabled": false,
"location": 97
但我收到了那个错误。模型已保存,但响应给了我错误
内部服务器错误:/api/v1/checklists/3/ 回溯(最近一次通话最后): 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/django/core/handlers/exception.py”,第 41 行,在内部 响应 = get_response(请求) _get_response 中的文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/django/core/handlers/base.py”,第 187 行 response = self.process_exception_by_middleware(e, request) _get_response 中的文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/django/core/handlers/base.py”,第 185 行 响应 = Wrapped_callback(request, *callback_args, **callback_kwargs) 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/django/views/decorators/csrf.py”,第 58 行,位于 Wrapped_view 返回 view_func(*args, **kwargs) 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/rest_framework/viewsets.py”,第 116 行,在视图中 return self.dispatch(request, *args, **kwargs) 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/rest_framework/views.py”,第 495 行,在调度中 响应 = self.handle_exception(exc) 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/rest_framework/views.py”,第 455 行,在 handle_exception self.raise_uncaught_exception(exc) 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/rest_framework/views.py”,第 483 行,在调度中 self.initial(请求,*args,**kwargs) 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/rest_framework/views.py”,第 401 行,初始 self.check_permissions(请求) 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/rest_framework/views.py”,第 334 行,在 check_permissions 如果不是 permission.has_permission(request, self): 文件“/home/adifilippo/.envs/accomodation/local/lib/python2.7/site-packages/rest_framework/permissions.py”,第 206 行,在 has_permission perms = self.get_required_permissions(request.method, queryset.model) AttributeError:“响应”对象没有属性“模型” "PUT /api/v1/checklists/3/HTTP/1.1" 500 42934
在此处输入代码
【问题讨论】:
你能发帖class ChecklistSerializer
class ChecklistSerializer(serializers.ModelSerializer): class Meta: model = Checklist depth = 1 fields = ('id', 'approved_by', 'role', 'hardship_classification', 'total_capacity', 'capacity_for_residents '、'checklist_type'、'state'、'pdf'、'submitting_afp'、'disabled'、'location')
@AmedeoDiFilippo 你能发布完整的回溯
@WillKeeling perms = self.get_required_permissions(request.method, queryset.model) AttributeError: 'Response' object has no attribute 'model' "PUT /api/v1/checklists/3/HTTP/1.1 " 500 42934
【参考方案1】:
get_queryset
方法应该返回 queryset
而不是 Response
,并且更新操作应该在 put
方法中被覆盖。阅读此处class-based-views 和
filtering 了解更多详情。可能您需要删除 get_queryset
覆盖并添加 put
方法,如下所示:
def put(self, request, pk, format=None):
instance = self.get_object(pk)
# pass in the instance we want to update
serializer = ChecklistSerializer(instance, self.request.data)
# validate and update
if serializer.is_valid():
serializer.save()
serializer_dict = serializer.data
serializer_dict["message"] = "Checklist updated successfully."
return response.Response(serializer_dict, status=status.HTTP_200_OK)
else:
return response.Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
【讨论】:
我在我的项目中使用 Django 1.11 django 版本无关紧要。你为什么写它? 对不起,我是 Django 和 python 的新手。对于该方法,我在我的 urls 文件中定义了正确的 url .*py?我的 urls.py 是这样的: router.register(r'checklists', checklist.ChecklistViewSet, base_name='checklists') urlpatterns = ( url(r'^', include(router.urls)), )【参考方案2】:你可以这样做
from django.shortcuts import get_objects_or_404
class YourAPIView(ModelViewSet):
def put(self, request, pk):
instance = get_objects_or_404(YourModel, pk=pk)
serializer = ChecklistSerializer(instance, self.request.data)
# validate and update
if serializer.is_valid():
serializer.save()
serializer_dict = serializer.data
serializer_dict["message"] = "Checklist updated successfully."
return response.Response(serializer_dict, status=status.HTTP_200_OK)
return response.Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)
【讨论】:
以上是关于Django Rest Framework:序列化程序响应错误的主要内容,如果未能解决你的问题,请参考以下文章
python django-rest-framework 3.3.3 更新嵌套序列化程序
django-rest-framework、多表模型继承、ModelSerializers 和嵌套序列化器
Django.rest_framework:如何序列化一对多?
Django 序列化器与 rest_framework 序列化器