如何在express Router.route和控制器模式中触发next()？
如何在express Router.route和控制器模式中触发next()？
提问于 2018-07-28 23:34:46
在请求到达我的一个api路由之后，我似乎不知道如何实现'next()‘。我想在一切都完成之后做日志记录，而不是在我的api路由之前。我已经在我的路由上实现了控制器模式。我现在只能记录错误，但我想记录所有请求：
//------ api/index.js
import routes from './routes/index.route';
app.use('/api', routes);
// ??? HOW TO HANDLE next() called in "/api routes"
// only handles incoming requests not found in "/api routes"
app.use((req, res, next) => {
// logic here...
next(error);
});
// global error handler
app.use((error, req, res, next) => {
// logging logic here...
});
//------ routes/index.route.js
import express from 'express';
import userRoutes from './user.route';
import bookRoutes from './book.route';
const router = express.Router();
router.use('/user', userRoutes);
router.use('/book', bookRoutes);
//------ routes/book.route.js
import express from 'express';
import bookCtrl from './../controllers/book.controller';
const router = express.Router();
router.route('/:bookId').get(bookCtrl.getBook);
//------ controllers/book.controller.js
export const getBook = async (req, res, next) => {
const book = // get book logic here;
return res.status(httpStatus.OK).json(book);
// HOW DO I TRIGGER next()?
// I tried this approach as well:
// res.status(httpStatus.OK).json(book);
// next();
//however, it would say, "Error: Can't set headers after they are sent."
}非常感谢。
回答 2
Stack Overflow用户
发布于 2018-07-29 00:42:06
我想出了一种触发next的方法，它不是立即发送响应，而是将其分配给res.locals并调用next。以下是基于我上面的代码的更改：
//------ api/index.js
// handle next() event coming from "/api routes"
// and also handles incoming requests not found in "/api routes"
app.use((req, res, next) => {
if (res.locals.status) {
const { status, responseData } = res.locals;
res.status(status).json(responseData);
// logging logic here...
} else {
// error logic here...
// forward this error into the global error handler
next(error);
}
});
// controllers/book.controller.js
export const getBook = async (req, res, next) => {
// get book logic here..
const book = // get book logic here;
res.locals = {
status: httpStatus.OK,
responseData: {
book,
},
};
next();
}感谢@destoryer的res.json提示！:)
Stack Overflow用户
发布于 2018-07-28 23:37:18
只需替换
return res.status(httpStatus.OK).json(book);
// HOW DO I TRIGGER next()? 使用
res.status(httpStatus.OK).json(book);
next();它会起作用的。
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原文链接：
https://stackoverflow.com/questions/51572811
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