如何使用react redux在帖子中插入数据?

问题描述

我正在学习 react-redux，所以我正在为使用 JSON 占位符 API 的用户创建一个 CRUD 应用程序，现在我能够显示数据、删除和编辑，但是我在添加数据时遇到了问题.

I am learning react-redux, so I am creating a CRUD app for users using JSON placeholder API, now I am able to display data, delete and edit, but I have a problem with adding data.

这是沙箱中的现场演示:redux 现场演示

Here is a live demo in the sandbox : redux live demo

现在，当我单击添加用户按钮时，出现以下错误.

Now when I click add user button I get the following error.

Cannot read property 'editing' of undefined.

这是我添加用户的表单组件.

Here is my form component to add a user.

import React, { useState } from 'react'
import {useDispatch} from 'react-redux'
import {addUser, addNewUser  } from './redux/acitons/users/Users';

function AddUserForm({ user }) {
    const dispatch = useDispatch();
    const [name, setName ] = useState(user.name);

   const handleSubmit = () =>{
        console.log(name)
        dispatch(addNewUser( {
            ...user, name
        }));
   }

  const handleCancel = () => {
      console.log(user.id);
      dispatch(addUser(user.id))
  }
  return (
    <tr>
      <td>{user.id}</td>
      <td>
        <input
          defaultValue={user.name}
          onChange={e => setName(e.target.value)}
        />
      </td>
      <td>
        <button type="button" className="btn outline" onClick={handleCancel}>
          <i className="material-icons">Cancel</i>
        </button>
        <button
          type="button"
          className="btn btn-success btn-link"
          onClick={handleSubmit}
        >
          <i className="material-icons">save</i>
        </button>
      </td>
    </tr>
  );
}

export default AddUserForm

我需要做什么来解决问题?，任何帮助或建议将不胜感激，现场演示可以在沙箱中找到redux 演示

What do I need to do to solve the problem?, any help or suggestions will be appreciated, the live demo can be found here in the sandboxredux demo

推荐答案

查看您的代码 - 由于您没有将任何用户有效负载对象传递给 addUser 调度，因此您的应用似乎正在崩溃调用(在 User.js 第 64 行).

Looking at your code - it seems like your app is breaking since you are not passing any user-payload object to theaddUser dispatch call(on User.js line 64).

这是一种可能的方法解决这个问题:

Here's a possible way to solve this:

传递一个新用户有效负载对象，其 id 比列表中的前一个用户高 1)，然后为该新 id 调度一个 editUser.

Passing a new-user payload object with an id 1 higher than the previous user on the list) and then dispatch an editUser for that new id.

const addNewUser = () => {
    const usersList = userData.users;
    const newUserId = usersList[usersList.length - 1].id + 1;
    addUser({
      id: newUserId
    });
    editUser(newUserId);
  };

这是一个非常简单的解决方案(例如 - 更好的方法是为每个用户提供一个唯一的 id 并索引客户端上的列表而不是基于服务器 id) - 但它应该让你知道如何推动这一进程.

This is a very simplified solution (for example - a better approach would be to give a unique id to each user and index the list on the client not based on the server ids) - but it should give you an idea of how to take this forward.

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