Question

我想将redux状态的值从reducer传递给另一个reducer。就我而言，我想将groups的值从groupReducer.js的状态传递到scheduleReducer.js。我正在使用combineReducers中的redux在它们之间进行组合。

这是我的代码： groupReducer.js

...
const initialState = {
groups: [],
...
export default function(state = initialState, action) {
  switch (action.type) {
  case FETCH_GROUPS:
    return {
      ...state,
      groups: action.payload
    };
...

scheduleReducer.js

const initialState = {
  ...
}
...
export default function(state = initialState, action) {
  switch (action.type) {
  case GROUP_INFO:
    return {
      group: groupInfo(action.payload.id, SHOULD_PASS_GROUPS_FETCHED_FROM_GROUPREDUCER)
    };

我想将groups传递给最后一个减速器，我该怎么做？

Answer 1

您可以执行以下操作。
获取您的应用程序的运行状态创建者，然后访问组简化程序的状态以获取groups

const getGroupInfo = () => (dispatch, getState) => {
  const appState = getState();
  const groups = appState.groupReducerKey.groups;
  // code...

  dispatch({
    type: ' GROUP_INFO',
    payload: {
      id:'',
      // any other data
      groups: groups,
    },
  });
};


// scheduleReducer.js
const initialState = {
  ...
}
...
export default function(state = initialState, action) {
  switch (action.type) {
  case GROUP_INFO:
  // access here 
  // action.payload.groups
    return {
      group: groupInfo(action.payload.id, action.payload.groups)
    };
  }
}

我建议阅读更多有关Redux文档中的reducer之间共享数据的信息：https://redux.js.org/recipes/structuringreducers/beyondcombinereducers#sharing-data-between-slice-reducers

Answer 2

您可以使用thunk访问完整的state对象。从groupReducer获取组，然后调用操作SHOULD_PASS_GROUPS_FETCHED_FROM_GROUPREDUCER将这些组传递给sheduleReducer。

// thunk action creator, use it as a normal action creator     //
//  while dispatching                                            //
function passGroupFetchedFromGroupReducer() {
  return function (dispatch, getState) {

    // Get state object from getState(). Try console.log(getState() to get 
    // idea of the shape of what getState() returns.

    const groupsToPass = getState().groupReducer.groups;

    // Then dispatch your action with the payload
    dispatch({
     type: 'SHOULD_PASS_GROUPS_FETCHED_FROM_GROUPREDUCER',
     payload: groupsToPass
    })
  };
}

// scheduleReducer.js //
const initialState = {
  groups: [],
  ...
}
...
export default function(state = initialState, action) {
  switch (action.type) {
  case GROUP_INFO:
    return {
      ...state,
      groups: action.payload
  };
}

将状态值从Redux减速器传递到另一个减速器

2 个答案: