在学习 Django rest framework 时,我得到了一个 AssertionError at/tasks/1 错误
预期 View TaskDetail 将使用名为“pk”的 URL 关键字参数调用。修复您的 URL 配置,或正确设置 View 上的 .lookup_field
属性。
我的模型.py
class Task(models.Model):
owner=models.ForeignKey('auth.User',related_name='tasks')
completed=models.BooleanField(default=False)
title=models.CharField(max_length=100)
description=models.TextField()
序列化器.py
class TaskSerializer(serializers.ModelSerializer):
class Meta:
model = Task
read_only=('owner.username',)
fields=('title','description','completed','owner.username')
权限.py
class IsOwnerOrReadOnly(BasePermission):
def has_object_permission(self, request, view, obj):
if request.method is SAFE_METHODS:
return True
return obj.owner==request.user
View .py
class TasksMixins(object):
queryset = Task.objects.all()
serializer_class=TaskSerializer
permission_classes=(IsOwnerOrReadOnly,)
def pre_save(self,obj):
obj.owner=self.request.user
class TaskList(TasksMixins,ListCreateAPIView):
pass
class TaskDetail(TasksMixins,RetrieveUpdateDestroyAPIView):
pass
网址.py
urlpatterns = [
url(r'^$', views.home, name='home'),
url(r'^tasks/$', views.TaskList.as_view(), name='task_list'),
url(r'^tasks/(?P<id>[0-9]+)$', views.TaskDetail.as_view(), name='task_detail')
]
回溯
Traceback (most recent call last):
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 149, in get_response
response = self.process_exception_by_middleware(e, request)
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/django/core/handlers/base.py", line 147, in get_response
response = wrapped_callback(request, *callback_args, **callback_kwargs)
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/django/views/decorators/csrf.py", line 58, in wrapped_view
return view_func(*args, **kwargs)
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/django/views/generic/base.py", line 68, in view
return self.dispatch(request, *args, **kwargs)
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/rest_framework/views.py", line 466, in dispatch
response = self.handle_exception(exc)
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/rest_framework/views.py", line 463, in dispatch
response = handler(request, *args, **kwargs)
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/rest_framework/generics.py", line 286, in get
return self.retrieve(request, *args, **kwargs)
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/rest_framework/mixins.py", line 56, in retrieve
instance = self.get_object()
File "/home/amogh/PycharmProjects/env_1.9/local/lib/python2.7/site-packages/rest_framework/generics.py", line 93, in get_object
(self.__class__.__name__, lookup_url_kwarg)
AssertionError: Expected view TaskDetail to be called with a URL keyword argument named "pk". Fix your URL conf, or set the `.lookup_field` attribute on the view correctly.
每当我导航到链接时,我都会收到此错误
非常感谢任何帮助...提前致谢
最佳答案
如果你想通过'pk'定位,只需重命名 id -> pk 到你的 url.py 中:
url(r'^tasks/(?P<pk>[0-9]+)$', views.TaskDetail.as_view(), name='task_detail')
如果您想通过 pk 以外的其他字段作为目标,则必须调整 url.py、view.py 和 serializer.py 来精确定位查找字段(可以嵌套),例如,它可能适合您.
网址.py:
url(r'^tasks/(?P<owner__username>[0-9]+)$', views.TaskDetail.as_view(), name='task_detail')
View .py:
class TasksMixins(object):
queryset = Task.objects.all()
serializer_class=TaskSerializer
permission_classes=(IsOwnerOrReadOnly,)
lookup_field = 'owner__username'
序列化器.py
class TaskSerializer(serializers.ModelSerializer):
owner = serializers.SlugRelatedField(slug_field='username',many=False, read_only=True)
class Meta:
model = Task
fields='__all__'
lookup_field = 'owner__username'
关于python - 网址处的 Django AssertionError,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/35825941/