Django中GET/PUT测试命令报错，咨询正确测试方法及问题原因

问题描述 #

POST和DELETE接口测试正常，对应的curl命令：

curl -X POST http://localhost:8000/user/ -H "Content-Type: application/json" -d "{\"username\": \"john_doe\", \"email\": \"john@example.com\", \"first_name\": \"John\", \"last_name\": \"Doe\"}"
curl -X DELETE http://localhost:8000/user/john_doe/

但执行GET、PUT命令时报错：

curl -X GET http://localhost:8000/user/john_doe/
curl -X PUT http://localhost:8000/user/john_doe/ -H "Content-Type: application/json" -d "{\"email\": \"john.new@example.com\"}"

问题原因 #

1. URL路由冲突：urls.py中重复定义了path('user/<username>/')，Django路由匹配从上到下执行，所有请求都会命中第一个绑定的delete_user视图，而该视图仅处理DELETE方法，GET/PUT请求无法得到正确响应。
2. update_user视图参数错误：pymongo的update_one第一个参数需要查询条件字典（如{'username': username}），而非直接传username；且该视图未返回任何响应，会触发服务器错误。
3. view_user视图序列化问题：MongoDB返回的文档包含ObjectId类型，JsonResponse无法直接序列化该类型，会抛出序列化异常。

修正后的代码 #

urls.py #

将同一路径的多方法请求合并到单个视图，避免路由冲突：

from django.urls import path
from . import views

urlpatterns = [
    path('user/', views.create_user),
    path('user/<username>/', views.user_detail),
]

views.py #

修复参数错误、序列化问题，并统一处理同一路径的GET/PUT/DELETE方法：

import json
import pymongo
from bson.objectid import ObjectId
from django.http import JsonResponse
from django.views.decorators.csrf import csrf_exempt


client = pymongo.MongoClient('mongodb://localhost:27017/')
database = client['PoseTrack_Database']
users = database['users']


def serialize_user(user):
    # 将MongoDB的ObjectId转换为字符串，支持JsonResponse序列化
    if user:
        user['_id'] = str(user['_id'])
    return user


@csrf_exempt
def create_user(request):
    if request.method == 'POST':
        user_data = json.loads(request.body)
        users.insert_one(user_data)
        return JsonResponse({'status': 'success', 'message': 'User created successfully!'}, status=201)
    return JsonResponse({'status': 'error', 'message': 'Method not allowed'}, status=405)


@csrf_exempt
def user_detail(request, username):
    if request.method == 'GET':
        user = users.find_one({'username': username})
        if not user:
            return JsonResponse({'status': 'error', 'message': 'User not found'}, status=404)
        return JsonResponse(serialize_user(user))
    
    elif request.method == 'PUT':
        new_data = json.loads(request.body)
        result = users.update_one({'username': username}, {'$set': new_data})
        if result.matched_count == 0:
            return JsonResponse({'status': 'error', 'message': 'User not found'}, status=404)
        return JsonResponse({'status': 'success', 'message': 'User updated successfully!'})
    
    elif request.method == 'DELETE':
        result = users.delete_one({'username': username})
        if result.deleted_count == 0:
            return JsonResponse({'status': 'error', 'message': 'User not found'}, status=404)
        return JsonResponse({'status': 'success', 'message': 'User deleted successfully!'}, status=200)
    
    return JsonResponse({'status': 'error', 'message': 'Method not allowed'}, status=405)

正确测试命令（执行顺序） #

1. 创建用户

curl -X POST http://localhost:8000/user/ -H "Content-Type: application/json" -d "{\"username\": \"john_doe\", \"email\": \"john@example.com\", \"first_name\": \"John\", \"last_name\": \"Doe\"}"

2. 查询用户

curl -X GET http://localhost:8000/user/john_doe/

3. 更新用户

curl -X PUT http://localhost:8000/user/john_doe/ -H "Content-Type: application/json" -d "{\"email\": \"john.new@example.com\"}"

4. 删除用户

curl -X DELETE http://localhost:8000/user/john_doe/

内容的提问来源于stack exchange，提问作者marc.mitrasca