问题
Haven't been able to find anything around here regarding this error:
"Store does not have a valid reducer. Make sure the argument passed to combineReducers is an object whose values are reducers."
My reducer
export default function FriendListReducer(state = {friends : []}, action) {
switch (action.type) {
case 'ADD_FRIEND':
return [
{ friends : action.payload.friend }, ...state.friends
]
default:
return state;
}
return state;
}
Combiner
import { combineReducers } from 'redux';
import { FriendListReducer } from './FriendListReducer';
const rootReducer = combineReducers({
friends: FriendListReducer
});
export default rootReducer;
My store config
import { applyMiddleware, createStore } from 'redux';
import thunkMiddleware from 'redux-thunk';
import createLogger from 'redux-logger';
import rootReducer from '../reducers/reducers';
export default function configureStore(initialState = { friends: [] }) {
const logger = createLogger({
collapsed: true,
predicate: () =>
process.env.NODE_ENV === `development`, // eslint-disable-line no-unused-vars
});
const middleware = applyMiddleware(thunkMiddleware, logger);
const store = middleware(createStore)(rootReducer, initialState);
if (module.hot) {
// Enable Webpack hot module replacement for reducers
module.hot.accept('../reducers/reducers', () => {
const nextRootReducer = require('../reducers/reducers').default;
store.replaceReducer(nextRootReducer);
});
}
return store;
}
回答1:
Your import
statement is incorrect. Either you use import { Foo } from 'bar'
together with export Foo
, or use import Foo from 'bar'
if you export with export default Foo
.
In other words, change either export default function FriendListReducer
to export function FriendListReducer
, or change the import statement from import { FriendListReducer }
to import FriendListReducer
.
回答2:
If the object is empty.
export default combineReducers({
})
This error will show.
回答3:
../reducers/reducers ? it's a strange naming
Anyway, it seems ../reducers/reducers doesn't return a reducer, if reducers is a directory, put a index.js inside, import each reducer and create a root reducer
import FriendListReducer from "./FriendListReducer"
const rootReducer = combineReducers({
friendList : FriendListReducer
})
export default rootReducer
you will have state.friendList in your state.
I hope it will help
回答4:
It looks like your top-level reducer function is using an array as its default value. Redux expects that the very top of your state will be an object, not an array. Try putting the array at a particular key in that object, like { friendList : [] }
.
回答5:
Please check your combine reducer file It's empty......
you have forgot bind reducer here
import {combineReducers, createStore} from 'redux'
import listDataReducer from '../reducers/ListDataReducer'
const rootReducer = combineReducers({
listDataReducer, // Please add your reducer here
});
export default rootReducer;
来源:https://stackoverflow.com/questions/36407937/redux-store-does-not-have-a-valid-reducer