如何使用 Redux Toolkit 从 Redux 状态中删除数组中的单个元素？

Question

我正在使用redux-toolkit库中的createSlice()函数添加和删除数组中的项目。

addProject reducer函数工作正常，但removeProject不起作用。

// projects.js

import { createSlice } from "@reduxjs/toolkit";

let lastId = 0;

const slice = createSlice({
  name: "projects",
  initialState: [],
  reducers: {
    projectAdded: (projects, action) => {
      projects.push({
        id: ++lastId,
        name: action.payload.name,
      });
    },
    projectRemoved: (projects, action) =>
      (projects = projects.filter((pro) => pro.id !== action.payload.id)),
  },
});
export const { projectAdded, projectRemoved } = slice.actions;
export default slice.reducer;

//store.js

import { configureStore } from "@reduxjs/toolkit";
import reducer from "./projects";
const store = configureStore({ reducer: reducer });

export default store;

//index.js

import store from "./store/store";
import { projectAdded, projectRemoved } from "./store/projects";
const unsubscribe = store.subscribe(() => {
  console.log("store Changed", store.getState());
});
store.dispatch(projectAdded({ name: "Project 1" }));
store.dispatch(projectRemoved({ id: 1 }));

- brownbunny

Answer 1

你正在替换状态树的根对象（projects）- 这会破坏 immer 的变更检测功能。

最简单的方法是直接返回筛选后的数组，不要先赋值到草稿对象中：

projectRemoved: (projects, action) => projects.filter((pro) => pro.id !== action.payload.id),

参见： https://immerjs.github.io/immer/docs/update-patterns#array-mutations

- Johannes Reuter