商店没有有效的减速器。反应减少

Question

我有上面的问题，我试过this，但没有运气。

这里是我的店：

import { compose, combineReducers, applyMiddleware, createStore } from "redux"; 
import thunkMiddleware from "redux-thunk"; 
import * as activities from "../reducers/activities"; 
import * as location from "../reducers/location"; 

const configureStore = railsProps => { 
    const composedStore = compose(
    applyMiddleware(thunkMiddleware), 
    window.__REDUX_DEVTOOLS_EXTENSION__ && window.__REDUX_DEVTOOLS_EXTENSION__() 
); 

    const combinedReducers = combineReducers({ 
    location, 
    activities 
    }); 
    return composedStore(createStore)(combinedReducers, railsProps); 
}; 

export default configureStore; 

这里是我的位置减速机：

import { combineReducers } from "redux"; 
import * as actions from "../constants/constants"; 

const coordinates = (state = {}, action) => { 
    switch (action.type) { 
    case actions.GET_LOCATION_SUCCESS: 
    case actions.GET_LOCATION_REQUEST: 
    case actions.GET_LOCATION_FAILURE: 
    default: 
     return state; 
    } 
}; 

const reducer = coordinates; 

export default reducer; 

这里是我的活动减速机：

import { combineReducers } from "redux"; 
import * as actions from "../constants/constants"; 

const page = (state = 0, action) => { 
    switch (action.type) { 
    case actions.NEXT_ACTIVITY_PAGE: 
     return action.page < action.totalPages - 1 
     ? action.page + 1 
     : action.page; 
    case actions.PREV_ACTIVITY_PAGE: 
     return action.page > 0 ? action.page - 1 : 0; 
    default: 
     return state; 
    } 
}; 

const activities = (state = {}, action) => { 
    switch (action.type) { 
    case actions.FETCH_ACTIVITIES_SUCCESS: { 
     return state.concat(action.activities); 
    } 
    case actions.FETCH_ACTIVITIES_REQUEST: 

    case actions.FETCH_ACTIVITIES_FAILURE: 

    default: 
     return state; 
    } 
}; 

const reducer = combineReducers({ page, activities }); 

export default reducer; 

我想这事做与combineReducers方法以及我如何导入内容，但我不确定那里有什么问题。

感谢

Answer 1

这是错误的：当你减速是默认出口

import * as activities from "../reducers/activities"; 
import * as location from "../reducers/location"; 

以上将出口从文件中的所有命名的出口。

正确：

import activities from "../reducers/activities"; 
import location from "../reducers/location"; 

编辑：

，如果你想从文件导出减速让他们命名

：

export const page = (state = 0, action) => { 
    switch (action.type) { 
    ... 
    } 
}; 

export const activities = (state = {}, action) => { 
    switch (action.type) { 
    ... 
    } 
}; 

及更高版本：

import { page, activities } from 'path/to/file.js';