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python - APIView的POST方法中的Django Rest Framework验证

问题描述

我是 DRF 的新手，正在尝试构建一个 rest api，我需要为任务执行创建一个 api，而不仅仅是为 CRUD，这就是为什么我将 APIView 的 POST 方法覆盖为：

class DeploymentsList(viewsets.ModelViewSet):
    queryset = DeploymentOnUserModel.objects.all()
    serializer_class = DeploymentonUserSerializer

    def create(self, request, *args, **kwargs):
        """overwrite this for extra actions"""
        serializer = self.serializer_class(data=request.data)
        if serializer.is_valid(raise_exception=True):
            print('valid request')
            serializer.save()
            return Response(serializer.data)
        else:
            print('Something invalid')
            return Response('Invalid request')

模型.py：

    services = (
    ('Single', 'Single'),
    ('Multiple', 'Multiple'),
)


class DeploymentOnUserModel(models.Model):
    deployment_name = models.CharField(max_length=256, )
    credentials = models.TextField(blank=False)
    project_name = models.CharField(max_length=150, blank=False)
    project_id = models.CharField(max_length=150, blank=True)
    cluster_name = models.CharField(max_length=256, blank=False)
    zone_region = models.CharField(max_length=150, blank=False)
    services = models.CharField(max_length=150, choices=services)
    configuration = models.TextField()
    routing = models.TextField()

    def save(self, **kwargs):
        if not self.id and self.services == 'Multiple' and not self.routing and not self.configuration:
            raise ValidationError("You must have to provide routing for multiple services deployment.")
        super().save(**kwargs)

序列化程序.py：

class DeploymentonUserSerializer(serializers.ModelSerializer):
    model = DeploymentOnUserModel
    fields = '__all__'
    readonly_fields = 'pk'

网址.py：

app_name = 'deployments'

urlpatterns = [
    path('deployments/', apiview.DeploymentsList.as_view({'get': 'list', 'post': 'create'}), name='deployment_list'),
    path('deployments/<int:pk>', apiview.DeploymentDetail.as_view(), name='deployment_detail')

]

错误返回：

AttributeError：“str”对象没有属性“values”

更新：完整追溯

Internal Server Error: /api/v1/deployments/
Traceback (most recent call last):
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/django/core/handlers/exception.py", line 35, in inner
    response = get_response(request)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/django/core/handlers/base.py", line 128, in _get_response
    response = self.process_exception_by_middleware(e, request)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/django/core/handlers/base.py", line 126, in _get_response
    response = wrapped_callback(request, *callback_args, **callback_kwargs)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/django/views/decorators/csrf.py", line 54, in wrapped_view
    return view_func(*args, **kwargs)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/rest_framework/viewsets.py", line 95, in view
    return self.dispatch(request, *args, **kwargs)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/rest_framework/views.py", line 494, in dispatch
    response = self.handle_exception(exc)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/rest_framework/views.py", line 454, in handle_exception
    self.raise_uncaught_exception(exc)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/rest_framework/views.py", line 491, in dispatch
    response = handler(request, *args, **kwargs)
  File "/Users/abdul/PycharmProjects/KontainerApi/deployments/apiview.py", line 15, in create
    serializer.is_valid(raise_exception=False)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/rest_framework/serializers.py", line 236, in is_valid
    self._validated_data = self.run_validation(self.initial_data)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/rest_framework/serializers.py", line 435, in run_validation
    value = self.to_internal_value(data)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/rest_framework/serializers.py", line 459, in to_internal_value
    fields = self._writable_fields
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/django/utils/functional.py", line 36, in __get__
    res = instance.__dict__[self.name] = self.func(instance)
  File "/Users/abdul/KontainerApi/lib/python3.6/site-packages/rest_framework/serializers.py", line 370, in _writable_fields
    field for field in self.fields.values()
AttributeError: 'str' object has no attribute 'values'
[27/Jun/2018 16:11:41] "POST /api/v1/deployments/ HTTP/1.1" 500 15073

但我不知道如何验证请求？当我覆盖 APIView 的 POST 方法时。

发布数据：

  {
"deployment_name": "dep5",
"credentials": "cre4",
"project_name": "pro4",
"project_id": "004",
"cluster_name": "clus4",
"zone_region": "zon4",
"services": "Single",
"configuration": "conf4",
"routing": "route4"

}

标签： pythondjangopython-3.xdjango-rest-frameworkdrf-queryset

解决方案

目前还不是很清楚你想要实现什么。

我会说您希望在收到请求并验证输入数据后执行其他任务。

虽然不确定您想要执行什么样的任务以及何时 - 在保存模型之前或之后。

但是您可以在创建模型之前像这样进行创建：

 def create(self, request, *args, **kwargs):
    serializer = self.get_serializer(data=request.data)
    serializer.is_valid(raise_exception=True)

     **.... your task - access to data via serializer.validated_data....**

    self.perform_create(serializer)        
    return Response(serializer.data)

或者如果您想在创建模型后执行某些操作，您可以覆盖 perform_create （正如我们从 create 方法的实现中看到的，它在输入被验证后被调用）

def perform_create(self, serializer):
    instance =  serializer.save()
     .... your task ....

更新以解决问题“AttributeError：'str'对象没有属性'values'”

问题在于您对 viewset 的使用 - Viewset 为您提供了一个“资源控制视图”，您可以使用它来列出、检索、更新、删除资源。

您不需要在 urlconf 中为列表/创建和详细信息显式注册视图。

相反，使用路由器类执行此操作，它将为您提供所有视图（包括细节）：

router = DefaultRouter()
router.register(r'deployment', DeploymentsList, base_name='deployment')
urlpatterns = router.urls

现在你可以这样做：

  • GET部署/
  • 发布部署
  • 获取部署/{id} -> 详细信息

您遇到的另一个问题是验证。我不建议在模型的保存功能中提高 ValidationError。

有一个序列化程序来处理您的验证，您可以在 DeploymentUserSerializer 的 validate 函数中执行此操作

def validate(self, attrs):
    # perform your validation here
    return attrs

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