Redux 工具包：在 reducer 中显示为 Proxy / undefined 的状态

Question

解决了，谢谢！ - 对于任何感兴趣的人，我试图在减速器中访问 state.tasks.data 但是由于范围，我可以通过 [= 访问它94=] 因为我已经在任务片中了。

编辑： 我的突变状态错误问题现已修复，这是由于直接对状态进行排序而没有从中创建新数组。在 sort().

之前，concat() 已经解决了这个问题

我的新问题是我的 removeTask reducer 中的 state 无法再访问。现在 returning 未定义。如果我 console.log(state) 那么它将 return 一个 Proxy with:

[[Handler]]: null,
[[Target]]: null,
[[IsRevoked]]:true

编辑 2： 我发现 Proxy 是由于 immer 在引擎盖下做了一些突变以使用它的方式state 没有变异。我还没有解决 state.tasks.data returning undefined.

的问题

我正在使用 react-redux 和 redux-toolkit。我刚刚在学习 Redux，所以我的脑袋炸了，一点头绪都没有。

我遵循了他们网站上 redux-toolkit 基本教程中的一些信息，其中说你可以在 reducer 中改变状态，因为工具包在幕后做了一些事情来阻止它实际改变状态：

https://redux-toolkit.js.org/tutorials/basic-tutorial

无论如何，他们提供的反例会改变状态。增量减速器 returns state += 1 - 这工作正常

现在我有了自己的东西，我将 initial state 设置为我拉入的对象数组。见下文：

tasksSlice.js:

import { createSlice } from "@reduxjs/toolkit";
import data from "data/tasks_data.json";

export const tasksSlice = createSlice({
  name: "tasks",
  initialState: {
    data: data,
  },
  reducers: {
    removeTask: (state, action) => {
      const { id } = action.payload;
      const { data } = state.tasks;
      data = data.filter((item) => id !== item.id);
    },
  },
});

export const { removeTask } = tasksSlice.actions;

export const selectTasks = (state) => state.tasks.data;

export default tasksSlice.reducer;

现在我的 tasks 组件中列出了任务。每个任务都使用 taskItem 组件列出。在 taskItem 组件中，我有一个删除按钮，我已将 onClick 事件设置为使用 removeTask reducer。

<button
  className={`${styles.task_button} ${styles.delete}`}
  onClick={() => dispatch(removeTask(id))}
>
  <MdDeleteForever />
</button>

这是将 data 中的“customer_id”字段传递到 initial state 中映射到任务列表中的字段。

我希望能够删除任务，所以我试图通过过滤 state.tasks.data 和 return 过滤除任务之外的所有内容来改变它（正如工具包所说的那样） id 匹配。

不幸的是，我不断收到一条错误消息：

Error: Invariant failed: A state mutation was detected between dispatches, in the path 'tasks.data.0'. This may cause incorrect behavior.

tasks.js - 任务容器组件（相当混乱）：

import React, { useState, useEffect } from "react";
import SectionHeading from "components/SectionHeading/SectionHeading";
import { useSelector } from "react-redux";
import { selectTasks } from "redux/tasks/tasksSlice";
import TaskSelect from "./TaskSelect";
import TaskTabs from "./TaskTabs";
import TaskItem from "./TaskItem";
import styles from "./Tasks.module.scss";
// import tasks_data from "data/tasks_data.json";

const Tasks = () => {
  const tasksData = useSelector(selectTasks);
  console.log(tasksData);
  const [taskTab, setTaskTab] = useState({ activeTask: "All" });
  const [size, setSize] = useState({ width: 65, left: 0 });
  // const [tasksData, setTasksData] = useState(tasks_data);

  const taskTypes = [
    "All",
    "Quotes",
    "Domains",
    "SSL Setup",
    "SEO Setup",
    "Other",
  ];

  useEffect(() => {
    const activeBar = document.querySelector(".active_bar");
    const active = document.querySelector(".active_btn");
    if (size) {
      activeBar.style.width = `${active.offsetWidth}px`;
      activeBar.style.transform = `translate(${active.offsetLeft}px, ${active.offsetTop}px)`;
    }
  });

  const setActive = (e, type) => {
    setTaskTab({ activeTask: type });
    setSize(false);
    const activeBar = document.querySelector(".active_bar");
    activeBar.style.width = `${e.target.offsetWidth}px`;
    activeBar.style.transform = `translate(${e.target.offsetLeft}px, ${e.target.offsetTop}px)`;
  };

  const changeActive = (e) => {
    setTaskTab({ activeTask: e.target.value });
  };

  const getDaysDue = (days) => {
    const { days_due, overdue } = days;
    if (overdue === true) {
      if (days_due === -1) {
        return `${Math.abs(days_due)} day overdue`;
      } else {
        return `${Math.abs(days_due)} days overdue`;
      }
    } else if (days_due === 0) {
      return "Today";
    } else if (days_due === 1) {
      return `${days_due} day`;
    } else if (days_due > 1) {
      return `${days_due} days`;
    } else {
      return "Error getting days due";
    }
  };
  return (
    <article className="tasks">
      <TaskTabs
        taskTypes={taskTypes}
        click={setActive}
        activeTask={taskTab.activeTask}
        data={tasksData}
      />
      <TaskSelect taskTypes={taskTypes} change={changeActive} />
      <SectionHeading>Tasks: {taskTab.activeTask}</SectionHeading>
      <section className={styles.tasks_list}>
        {tasksData
          .sort((a, b) => a.days.days_due - b.days.days_due)
          .filter((task) =>
            taskTab.activeTask === "All"
              ? true
              : task.type === taskTab.activeTask
          )
          .map(
            ({
              customer_id,
              account_name,
              days,
              days: { days_due, overdue },
              type,
            }) => {
              return (
                <TaskItem
                  key={customer_id}
                  id={customer_id}
                  name={account_name}
                  days={getDaysDue(days)}
                  overdue={overdue}
                  daysDue={days_due}
                  type={type}
                />
              );
            }
          )}
      </section>
    </article>
  );
};

export default Tasks;

TaskItem.js:

import React from "react";
import { useDispatch } from "react-redux";
import { removeTask } from "redux/tasks/tasksSlice";
import { Link } from "react-router-dom";
import { MdModeEdit, MdDeleteForever } from "react-icons/md";
import styles from "./TaskItem.module.scss";

const TaskItem = ({ id, name, days, daysDue, overdue, type }) => {
  const dispatch = useDispatch();
  return (
    <article
      className={`
    ${styles.task} 
    ${daysDue === 0 ? `${styles.today}` : ""} 
    ${overdue === true ? `${styles.overdue}` : ""}
    `}
    >
      <Link to="/" className={styles.task_name}>
        {name}
      </Link>

      <span
        className={`${styles.task_days} ${
          daysDue === 0 ? `${styles.task_days__today}` : ""
        } ${overdue ? `${styles.task_days__overdue}` : ""}`}
      >
        <strong>{type}</strong>: {days}
      </span>

      <div className={styles.task_buttons}>
        <button className={`${styles.task_button} ${styles.edit}`}>
          <MdModeEdit />
        </button>

        <button
          className={`${styles.task_button} ${styles.delete}`}
          onClick={() => dispatch(removeTask(id))}
        >
          <MdDeleteForever />
        </button>
      </div>
    </article>
  );
};
export default TaskItem;

tasks_data.json:

[
  {
    "account_name": "Misty's Gym",
    "customer_id": 1,
    "days": {
      "days_due": 1,
      "overdue": false
    },
    "type": "Quotes"
  },
  {
    "account_name": "Brock's Diner",
    "customer_id": 2,
    "days": {
      "days_due": 0,
      "overdue": false
    },
    "type": "Quotes"
  },
  {
    "account_name": "Samurai Champloo's Fish Bar",
    "customer_id": 3,
    "days": {
      "days_due": 5,
      "overdue": false
    },
    "type": "SSL Setup"
  },
  {
    "account_name": "Tiny Rebel",
    "customer_id": 4,
    "days": {
      "days_due": -7,
      "overdue": true
    },
    "type": "Domains"
  },
  {
    "account_name": "Matalan",
    "customer_id": 5,
    "days": {
      "days_due": 13,
      "overdue": false
    },
    "type": "Other"
  },
  {
    "account_name": "Lowes Soft Drinks",
    "customer_id": 6,
    "days": {
      "days_due": 1,
      "overdue": false
    },
    "type": "SEO Setup"
  },
  {
    "account_name": "Snack 'n' Go",
    "customer_id": 7,
    "days": {
      "days_due": -2,
      "overdue": true
    },
    "type": "Quotes"
  },
  {
    "account_name": "Jeronemo",
    "customer_id": 8,
    "days": {
      "days_due": 5,
      "overdue": false
    },
    "type": "Quotes"
  },
  {
    "account_name": "Tom's Mouse Traps",
    "customer_id": 9,
    "days": {
      "days_due": 0,
      "overdue": false
    },
    "type": "Domains"
  },
  {
    "account_name": "Contiente",
    "customer_id": 10,
    "days": {
      "days_due": 2,
      "overdue": false
    },
    "type": "Domains"
  },
  {
    "account_name": "Um Bongo",
    "customer_id": 11,
    "days": {
      "days_due": -1,
      "overdue": true
    },
    "type": "SEO Setup"
  }
]

我究竟做错了什么？我还能如何设置状态？

干杯。

Answer 1

这样做：

removeTask: (state, action) => {
      const { id } = action.payload;
      const { data } = state.tasks;
      const index = data.findIndex((item) => id === item.id);
      data.splice(index, 1)
}

Answer 2

tasksData.sort（在您的 Tasks 组件中）修改商店中的原始 tasksData 数组，就像 sort 那样。事先从中创建一个新数组，例如通过 tasksData.concat().sort(...

Answer 3

在 reducer 动作中，状态打印为 Proxy 对象（在 Redux Toolkit 中），但是有一个基于 redux-toolkit docs current 的函数可以用来在 reducer 动作中打印你的状态，就像这样例如

import {createSlice,current } from '@reduxjs/toolkit'

const todoSlice = createSlice({
    name: 'todo',
    initialState,
    reducers: {
        deleteTodo(state,action) {
            console.log(current(state));
            let f=state.tasks.splice(action.payload,1);
        },  
    },
});

Redux 工具包：在 reducer 中显示为 Proxy / undefined 的状态

Redux Toolkit: state showing as Proxy / undefined within reducer

javascript

ecmascript-6

reactjs

react-redux

redux-toolkit