无法使用Reactjs fetch（）方法向Django REST API发送PUT请求

Question

我最近开始学习Reactjs&；制作了一个简单的Todo react应用程序，以便一点一点、一步一步地学习它。此Todo react前端中的数据来自一个简单的Todo Django REST API。但问题是我想改变“已完成”的状态来描述已完成的任务。我试图通过使用唯一的“id”向API发送PUT请求来实现这一点，但遇到了一些错误。以下是我的做法：

List.js

import React from 'react'
import Todo from './Todo'
import Nav from './Nav'


//Class based Component
class List extends React.Component {

    constructor() {
        super()
        this.state = {
            todos: [],
        }
        this.handleChange = this.handleChange.bind(this)
    }

    fetchData() {
        fetch('http://localhost:8000/Todo-api/')
            .then(response => response.json())
            .then((data) => {
                this.setState({
                    todos: data
                });
            });
    }

    componentDidMount() {
        this.fetchData();
    }

    

    handleChange(id) {
        this.setState(prevState => {
            const updatedData = prevState.todos.map(todo => {
                if (todo.id === id) {
                    todo.completed = !todo.completed
                }
                return todo
            })
            return {
                todos: updatedData
            }
        })

        fetch(`http://127.0.0.1:8000/Todo-api/${id}/?format=json/`,
            {
                method: 'PUT',
                headers: {
                    'Content-Type': 'application/json',
                    'Accept' : 'application/json',
                
                    // Other possible headers
                },
                body: JSON.stringify(this.state)

            }).then(function (response) {
                return response.json();
            }).then(function (data) {
                console.log("Data is ok", data);
            }).catch(function (ex) {
                console.log("parsing failed", ex);
            });
    }

    currentDate() {
        return new Date().getFullYear();
    }


    render() {
        const Data = this.state.todos.map(details => <Todo key={details.id} det={details} handleChange={this.handleChange} />)

        const someStyle = {
            marginTop: "40px", marginLeft: "100px", marginRight: "100px",
        }
        console.log(this.state.todos)
        return (
            <div>
                <Nav />

                <div className="todo-list box">
                    {Data}
                </div>

                <hr style={someStyle} />

                <p className="text-center" style={{ fontFamily: "Roboto Mono", lineHeight: 0.5 }}>Copyright ©️ {this.currentDate()} Parth Pandya </p>

                <p className="text-center" style={{ fontFamily: "Roboto Mono", fontSize: 10, lineHeight: 0.5 }}>Some rights reserved.</p>
            </div>
        )
    }
}

export default List

Todo.js

import React from 'react'



function Todo(props) {
  const completeStyles = {
    fontStyle: "italic",
    textDecoration: "Line-through",
    color: "gray",
  }

  return (
    <div className="todo-item">
      <input type="checkbox" onChange={() => props.handleChange(props.det.id)} checked={props.det.completed} />
      <p style={props.det.completed ? completeStyles : null}>{props.det.title}</p>
    </div>
  );
}

export default Todo;

API的views.py

from django.shortcuts import render
from rest_framework.response import Response
from rest_framework import status
from rest_framework.views import APIView
from .serializers import TodoDataSerializer
from .models import TodoData
# Create your views here.

class Todolist(APIView):
    serializer_class = TodoDataSerializer

    def get(self, request):
        ToDoData = TodoData.objects.all()
        serializer = TodoDataSerializer(ToDoData, many=True)
        return Response(serializer.data)

    def post(self, request):
        serializer = TodoDataSerializer(data=request.data)
        if(serializer.is_valid()):
            serializer.save()
            return Response(serializer.data, status=status.HTTP_201_CREATED)
        return Response(serializer.data, status=status.HTTP_404_BAD_REQUEST)

class TodoDetail(APIView):
    serializer_class = TodoDataSerializer

    def get(self, request, pk):
        ToDoData = TodoData.objects.get(pk=pk)
        serializer = TodoDataSerializer(ToDoData)
        return Response(serializer.data)

    def delete(self, request, pk):
        ToDoData = TodoData.objects.filter(pk=pk)
        ToDoData.delete()
        return Response(status=status.HTTP_204_NO_CONTENT)

    def put(self, request, pk):
        snippets = TodoData.objects.get(pk=pk)
        serializer = TodoDataSerializer(snippets, 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)

DELETE方法工作得很好，但我不知道如何为PUT/POST执行它。浏览了很多资源，但大多数都在建议axios，我现在不想使用。我想用fetch()来完成这项工作

当我使用body:JSON.stringify(this.state.todos)时，我得到以下错误：

PUT http://127.0.0.1:8000/Todo-api/4/ 400 (Bad Request) Data is ok {non_field_errors: Array(1)}non_field_errors: ["Invalid data. Expected a dictionary, but got list."]__proto__: Object

当我使用body:JSON.stringify(this.state)时，我得到以下错误：

PUT http://127.0.0.1:8000/Todo-api/4/ 400 (Bad Request) Data is ok {title: Array(1), completed: Array(1)} completed: ["This field is required."] title: ["This field is required."] __proto__: Object

现在该怎么办

（注意：要在本地测试它，请克隆thisgit存储库）

Answer 1

请尝试使用PATCH而不是PUT

• PUT用于完全对象更新
• PATCH用于部分更新（只能更新所选字段）

你需要的是PATCH

在更新请求中，请仅发送包含要更新的字段（{“status”：“complete”}）的dict，并在请求URL中设置id

更重要的是，您可以在我的文章中查看完整的工作CRUD示例：CRUD in Django Rest Framework and React