自定义 Redux 中间件 - 分派到中间件链的开头? [英] Custom Redux Middleware - Dispatch to beginning of middleware chain?
问题描述
我正在编写一个需要调度 thunk 操作的自定义中间件.问题是中间件在中间件链中 redux-thunk
之后被调用,所以我得到错误 Uncaught Error: Actions must be plain objects.使用自定义中间件进行异步操作.
使用提供的 dispatch
时.
I am writing a custom middleware that needs to dispatch thunk actions. The problem is that the middleware is called after redux-thunk
in the middleware chain, so I get the error Uncaught Error: Actions must be plain objects. Use custom middleware for async actions.
when using the provided dispatch
.
export default function createMiddleware() {
return ({dispatch, getState}) => next => (action) => {
if(action.type !== 'FOO') {
return next(action);
}
dispatch(thunkActionHere); // this is the issue
}
}
我想将这个 thunk 操作分派回中间件链的开头,以便 redux-thunk 可以处理它.这可能吗?
I would like to dispatch this thunk action back to the beginning of the middleware chain so that redux-thunk can handle it. Is this possible?
更新:
function createMiddleware(extraArgument) {
return function ({dispatch, getState}) {
return function (next) {
return function (action) {
switch (action.type) {
case 'FOO1':
dispatch({type: 'NORMAL_ACTION'}); // works fine
break;
case 'FOO2':
dispatch(function() {
return (dispatch, getState) => { // Error: Actions must be plain objects. Use custom middleware for async actions.
console.log('inside the thunk');
};
});
break;
default:
return next(action);
}
};
};
};
}
const middleware = createMiddleware();
middleware.withExtraArgument = createMiddleware;
export default middleware;
这是我的商店配置:
export default function configureStore(initialState) {
const store = createStore(rootReducer, initialState, compose(
// Add other middleware on this line...
applyMiddleware(bugsnagErrorCatcherMiddleware()),
applyMiddleware(thunk.withExtraArgument({APIFactory, PusherManager})),
applyMiddleware(webrtcVideoMiddleware.withExtraArgument(PusherManager)), // this is the middleware above
applyMiddleware(bugsnagbreadcrumbLoggerMiddleware()),
)
);
return store;
}
我不能将我的中间件放在 redux-thunk 之前,因为那样它就不会接收到 thunk 调度的操作.
I cannot put my middleware before redux-thunk because then it doesn't receive actions that thunks dispatch.
推荐答案
原来问题出在我的商店配置中.使用 redux 的 compose
导致了这个问题.
It turns out the issue was in my store configuration. Using redux's compose
caused the issue.
之前:
import {createStore, applyMiddleware, compose} from 'redux';
import thunk from 'redux-thunk';
import rootReducer from '../redux/reducers';
import webrtcVideoMiddleware from '../redux/middleware/webrtcVideo';
import bugsnagErrorCatcherMiddleware from '../redux/middleware/bugsnag/errorCatcher';
import bugsnagbreadcrumbLoggerMiddleware from '../redux/middleware/bugsnag/breadcrumbLogger';
import * as APIFactory from '../services/APIFactory';
import Pusher from '../services/PusherManager';
const PusherManager = new Pusher(false);
export default function configureStore(initialState) {
return createStore(rootReducer, initialState, compose(
applyMiddleware(bugsnagErrorCatcherMiddleware()),
applyMiddleware(thunk.withExtraArgument({APIFactory, PusherManager})),
applyMiddleware(webrtcVideoMiddleware(PusherManager)),
applyMiddleware(bugsnagbreadcrumbLoggerMiddleware())
));
}
之后:
import {createStore, applyMiddleware} from 'redux';
import thunk from 'redux-thunk';
import rootReducer from '../redux/reducers';
import webRTCVideoMiddleware from '../redux/middleware/webrtcVideo';
import bugsnagErrorCatcherMiddleware from '../redux/middleware/bugsnag/errorCatcher';
import bugsnagBreadcrumbLoggerMiddleware from '../redux/middleware/bugsnag/breadcrumbLogger';
import * as APIFactory from '../services/APIFactory';
import Pusher from '../services/PusherManager';
const PusherManager = new Pusher(false);
export default function configureStore(initialState) {
const middleware = [
bugsnagErrorCatcherMiddleware(),
thunk.withExtraArgument({APIFactory, PusherManager}),
webRTCVideoMiddleware.withExtraArgument(PusherManager),
bugsnagBreadcrumbLoggerMiddleware(),
];
return createStore(rootReducer, initialState, applyMiddleware(...middleware));
}
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