问题描述：

• 用django编写一个接口，用到django-rest-framwork的api_view装饰器
  代码如下：

from rest_framework.decorators import api_view
from rest_framework.response import Response

@api_view(["GET"])
def hello_world(request):
    return Response({"message": "hello world!"})

浏览器访问报错如下：

Cannot apply DjangoModelPermissions on a view that does not set .queryset or have a .get_queryset() method.

原因：

进入rest-farmwork设置了只读权限

解决方法：

在工程settings中找到

REST_FRAMEWORK = {
    # Use Django's standard `django.contrib.auth` permissions,
    # or allow read-only access for unauthenticated users.
    'DEFAULT_PERMISSION_CLASSES': [
        'rest_framework.permissions.DjangoModelPermissionsOrAnonReadOnly' 
    ]
}

将其变更为默认权限：

REST_FRAMEWORK = {
   # Use Django's standard `django.contrib.auth` permissions,
   # or allow read-only access for unauthenticated users.
   'DEFAULT_PERMISSION_CLASSES': [
       'rest_framework.permissions.DjangoModelPermissions'
   ]
}

google浏览器再次访问接口

image.png

火狐访问：

image.png

最终解决方法：
不设置权限，可以删掉

REST_FRAMEWORK = {
   # Use Django's standard `django.contrib.auth` permissions,
   # or allow read-only access for unauthenticated users.
   'DEFAULT_PERMISSION_CLASSES': [
   ]
}

或者在接口实现方法中再添加一个装饰器

from rest_framework.decorators import api_view, permission_classes
from rest_framework.response import Response
from rest_framework import permissions

@api_view(["GET"])
@permission_classes((permissions.AllowAny,))
def hello_world(request):
    return Response({"message": "hello world!"})

再次访问接口,成功。

image.png