Question

解决了，谢谢！-对于有兴趣的人，我正在尝试访问化简器中的state.tasks.data，但是由于范围的原因，我可以通过state.data来访问它，因为我已经在在任务切片中。

编辑：我的突变状态错误问题已得到解决，这是由于直接对状态进行排序而没有从中创建新数组所致。该问题已在concat()之前用sort()解决。

我的新问题是state中的removeTask reducer无法访问。现在返回未定义。如果我console.log(state)，它将返回一个带有以下内容的Proxy：

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

编辑2：我发现代理服务器是由于immer的幕后工作而进行的，它可以对突变进行某种处理，从而使state不突变。我仍然没有解决state.tasks.data返回undefined的问题。

我正在使用react-redux和redux-toolkit。我只是在学习Redux，所以我的头被炸了，没头绪。

我已经在他们网站上的redux-toolkit基本教程中关注了一些信息，该信息说您可以在化简器中对状态进行突变，因为Toolkit在幕后做了一些事情来阻止它实际上对状态进行突变：

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

无论如何，它们提供的反例都改变了状态。增量减少器返回state += 1-正常工作

现在我有了自己的东西，将initial state设置为我插入的对象数组。请参见下文：

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。使用taskItem组件列出了每个任务。在taskItem组件内部，有一个删除按钮，已将onClick事件设置为使用removeTask减速器。

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

这是从data传递“ customer_id”字段，该字段已从initial state映射到任务列表。

我希望能够删除任务，因此我试图通过过滤state.tasks.data并返回除id所在的任务以外的所有内容来对其进行突变（如工具包所说）一场比赛。

不幸的是，我不断收到错误消息：

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（非常混乱）：

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"
  }
]

我到底在做什么错？我还能如何设置状态？

干杯。

Answer 1

tasksData.sort（在您的Tasks组件中）会修改商店中的原始tasksData数组，就像sort那样。预先制作一个新的阵列，例如由tasksData.concat().sort(...

Answer 2

还请在reducer action中提醒，在redux工具包中，状态打印为代理对象。但是有一个基于 redux-toolkit dosc current 的函数，你可以用它来在像这样的 reducer 动作中打印你的状态，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)
        },
        
    },
   
});

Answer 3

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)
}

Redux Toolkit：状态显示为Proxy /在reducer中未定义

3 个答案: