主要更新

Question

我正在使用Django-REST-Framework和Apache Cassandra构建示例REST API。这是我的模型：

import uuid
from cassandra.cqlengine import columns
from cassandra.cqlengine.models import Model


class User(Model):
    read_repair_chance = 0.05
    user_id = columns.UUID(primary_key=True, default=uuid.uuid4)
    username = columns.Text(required=True)
    password = columns.Text(required=True)
    email = columns.Text(required=True)

    def __str__(self):
        return self.username

    def get(self,request, format=None):
        uname = [user.name for user in User.object.all()]
        return Response(uname)

我能够添加新用户并获得他们的列表。

但是当我尝试使用DELETE发出POSTMAN请求时，

DELETE http://localhost:8000/users/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce

我正在获取找不到页面404错误。有人可以确定我要去哪里错了。这是其余文件的内容： Views.py

from rest_framework import viewsets
from .models import User
from .serializers import UserSerializer
from rest_framework.response import Response
from rest_framework import status


class UserView(viewsets.ViewSet):
    def get_object(self, pk):
        try:
            return User.objects.get(pk=pk)
        except User.DoesNotExist:
            raise Http404

    def get_user_list(self, request):
        queryset = User.objects.all()
        serializer = UserSerializer(queryset,many=True)
        return Response(serializer.data)

    def get(self, request, pk, format=None):
        user = self.get_object(pk)
        serializer = UserSerializer(user)
        return Response(user.data)

    def post(self, request):
        serializer = UserSerializer(data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def put(self, request, pk, format=None):
        user = self.get_object(pk)
        serializer = UserSerializer(user, data=request.data)
        if serializer.is_valid():
            serializer.save()
            return Response(serializer.data)
        return Response(serializer.errors, status=status.HTTP_400_BAD_REQUEST)

    def delete(self, request, pk, format=None):
        user = self.get_object(pk)
        user.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)

项目URL：

from django.urls import path, include
urlpatterns = [
    path('users/', include('userdatabase.urls')),
    #path('',)
]

from django.urls import path, include
from .views import UserView
user_list = UserView.as_view({'get':'get_user_list', 'delete': 'delete'})

urlpatterns = [
    path('', user_list, name='user_list'),
    path('users/delete/<uuid:pk>', user_list, name='user_list')
]

serializers.py

import uuid
from rest_framework import serializers
from .models import User

class UserSerializer(serializers.Serializer):
    user_id = serializers.UUIDField(default=uuid.uuid4())
    username = serializers.CharField(required=True)
    password = serializers.CharField(required=True)
    email = serializers.CharField(required=True)

    def create(self, validated_data):
        return User.create(**validated_data)

    def update(self, instance, validated_data):
        instance.username = validated_data.get('email', instance.username)
        instance.password = validated_data.get('content', instance.password)
        instance.email = validated_data.get('created', instance.email)
        return instance

编辑当我在DELETE上使用POSTMAN时，得到以下HTML响应：

http://localhost:8000/users/delete/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce

<!DOCTYPE html>
<html lang="en">
    <head>
        <meta http-equiv="content-type" content="text/html; charset=utf-8">
        <title>Page not found at /users/delete/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce</title>
        <meta name="robots" content="NONE,NOARCHIVE">
        <style type="text/css">
    html * { padding:0; margin:0; }
    body * { padding:10px 20px; }
    body * * { padding:0; }
    body { font:small sans-serif; background:#eee; color:#000; }
    body>div { border-bottom:1px solid #ddd; }
    h1 { font-weight:normal; margin-bottom:.4em; }
    h1 span { font-size:60%; color:#666; font-weight:normal; }
    table { border:none; border-collapse: collapse; width:100%; }
    td, th { vertical-align:top; padding:2px 3px; }
    th { width:12em; text-align:right; color:#666; padding-right:.5em; }
    #info { background:#f6f6f6; }
    #info ol { margin: 0.5em 4em; }
    #info ol li { font-family: monospace; }
    #summary { background: #ffc; }
    #explanation { background:#eee; border-bottom: 0px none; }
  </style>
    </head>
    <body>
        <div id="summary">
            <h1>Page not found 
                <span>(404)</span>
            </h1>
            <table class="meta">
                <tr>
                    <th>Request Method:</th>
                    <td>DELETE</td>
                </tr>
                <tr>
                    <th>Request URL:</th>
                    <td>http://localhost:8000/users/delete/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce</td>
                </tr>
            </table>
        </div>
        <div id="info">
            <p>
      Using the URLconf defined in 
                <code>usermanager.urls</code>,
      Django tried these URL patterns, in this order:
            </p>
            <ol>
                <li>

                users/



                [name='user_list']

          </li>
                <li>

                users/


                users/delete/&lt;uuid:pk&gt;
                [name='user_list']

使用更新的URL（... /用户/用户/ ...）进行更改

Answer 1

您将delete作为网址格式的一部分：

path('users/delete/<uuid:pk>', user_list, name='user_list')

然而，当您运行邮递员时，您使用的网址中没有delete：

http://localhost:8000/users/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce

您应该改用以下网址：

http://localhost:8000/users/delete/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce

Answer 2

使用
http://localhost:8000/users/delete/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce代替
http://localhost:8000/users/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce

我还阅读了您的评论，基于以下原因，由于{strong>两个原因（或更多原因）引起的404错误
1.输入的URL与任何已定义的URL不匹配
2.在与给定的UUID相对应的数据库中找不到用户
因此，我建议在print()方法内添加一个delete()函数，以检查在API访问期间是否调用了该函数。

def delete(self, request, pk, format=None):
    print("inside delete")
    user = self.get_object(pk)
    user.delete()
    return Response(status=status.HTTP_204_NO_CONTENT)

或者，您可以使用POSTMAN或类似的工具检查响应

如果有任何错误，请使用追溯更新您的问题，并让我知道

主要更新

对于删除API，您应该使用

http://localhost:8000/users/users/delete/0f7b0ada-01ab-4907-b9d2-3fa0d27ae1ce

也就是说，我们都错过了api

中的 /users

Update-2

将
path('users/delete/<uuid:pk>', user_list, name='user_list')更改为

path('users/delete/<uuid:user_id>', user_list, name='user_list')

这是因为为您提供了pk的查找字段，但它应该是user_id

为什么Django给Page not found错误？

2 个答案:

主要更新

Update-2