[英]Router.use() requires middleware function but got a undefined
I am trying to set up my node server / REST api.我正在尝试设置我的节点服务器/REST api。
For this i have a few different files:为此,我有几个不同的文件:
division_model.js: Division_model.js:
module.exports = function(express, sequelize)
{
var router = express.Router();
router.route('/division');
var DataTypes = require("sequelize");
var Division = sequelize.define('division', {
id: DataTypes.INTEGER,
organization_id: DataTypes.INTEGER,
location_id: DataTypes.INTEGER,
name: DataTypes.STRING,
parent_id: DataTypes.INTEGER
}, { freezeTableName: true,
instanceMethods: {
retrieveAll: function (onSuccess, onError) {
Division.findAll({}, {raw: true})
.ok(onSuccess).error(onError);
},
retrieveById: function (user_id, onSuccess, onError) {
Division.find({where: {id: user_id}}, {raw: true})
.success(onSuccess).error(onError);
},
add: function (onSuccess, onError) {
var username = this.username;
var password = this.password;
var shasum = crypto.createHash('sha1');
shasum.update(password);
password = shasum.digest('hex');
Division.build({username: username, password: password})
.save().ok(onSuccess).error(onError);
},
updateById: function (user_id, onSuccess, onError) {
var id = user_id;
var username = this.username;
var password = this.password;
var shasum = crypto.createHash('sha1');
shasum.update(password);
password = shasum.digest('hex');
Division.update({username: username, password: password}, {where: {id: id}})
.success(onSuccess).error(onError);
},
removeById: function (user_id, onSuccess, onError) {
Division.destroy({where: {id: user_id}}).success(onSuccess).error(onError);
}
}
}
);
// on routes that end in /users/:user_id
// ----------------------------------------------------
router.route('/division/:division_id')
// update a user (accessed at PUT http://localhost:8080/api/users/:user_id)
.put(function (req, res) {
var user = User.build();
Division.username = req.body.username;
Division.password = req.body.password;
Division.updateById(req.params.division_id, function (success) {
console.log(success);
if (success) {
res.json({message: 'User updated!'});
} else {
res.send(401, "User not found");
}
}, function (error) {
res.send("User not found");
});
})
// get a user by id(accessed at GET http://localhost:8080/api/users/:user_id)
.get(function (req, res) {
var Division = Division.build();
Division.retrieveById(req.params.division_id, function (users) {
if (users) {
res.json(users);
} else {
res.status(401).send("User not found");
}
}, function (error) {
res.send("User not found");
});
})
// delete a user by id (accessed at DELETE http://localhost:8080/api/users/:user_id)
.delete(function (req, res) {
var division = Division.build();
division.removeById(req.params.division_id, function (users) {
if (users) {
res.json({message: 'User removed!'});
} else {
res.status(401).send("User not found");
}
}, function (error) {
res.send("User not found");
});
});
};
And my server.js还有我的 server.js
// BASE SETUP
// =============================================================================
var express = require('express'),
bodyParser = require('body-parser');
var app = express();
var router = express.Router();
var es = require('express-sequelize');
// =============================================================================
// IMPORT MODELS
// =============================================================================
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({
extended: true
}));
var env = app.get('env') == 'development' ? 'dev' : app.get('env');
var port = process.env.PORT || 8080;
var Sequelize = require('sequelize');
// db config
var env = "dev";
var config = require('./database.json')[env];
var password = config.password ? config.password : null;
// initialize database connection
var sequelize = new Sequelize(
config.database,
config.user,
config.password,
{
logging: console.log,
define: {
timestamps: false
}
}
);
//================================================================================
var division_model = require('./Divisions/division_model')(express,sequelize, router);
app.use('/division', division_model);
// REGISTER ROUTES
// =============================================================================
app.use('/api', app.router);
// START THE SERVER
// =============================================================================
app.listen(port);
console.log('Magic happens on port ' + port);
However with this i get the following error message when starting the server:但是,有了这个,我在启动服务器时收到以下错误消息:
throw new TypeError('Router.use() requires middleware function but got a
^
TypeError: Router.use() requires middleware function but got a undefined
at Function.<anonymous> (/var/www/example/backend/node_modules/express/lib/router/index.js:446:13)
at Array.forEach (native)
at Function.use (/var/www/example/backend/node_modules/express/lib/router/index.js:444:13)
at EventEmitter.<anonymous> (/var/www/example/backend/node_modules/express/lib/application.js:187:21)
at Array.forEach (native)
at EventEmitter.use (/var/www/example/backend/node_modules/express/lib/application.js:184:7)
at Object.<anonymous> (/var/www/example/backend/server.js:42:5)
at Module._compile (module.js:456:26)
at Object.Module._extensions..js (module.js:474:10)
at Module.load (module.js:356:32)
Can anyone tell me why this is happening?谁能告诉我为什么会这样?
You must return a router in your middleware here:您必须在此处返回中间件中的路由器:
app.use('/division', division_model);
So, your module export function should end with:因此,您的模块导出功能应以:
return router;
You also have conflicting ideas when setting this up.在设置它时,您也有相互矛盾的想法。 If you want the app to define the route as /division which you do here:如果您希望应用程序将路线定义为/division ,您可以在此处执行以下操作:
app.use('/division', division_model);
then you do not need to redefine the route again like you do here:那么你不需要像你在这里做的那样再次重新定义路线:
var router = express.Router();
router.route('/division');
You can simply:您可以简单地:
app.use(division_model);
-- or -- - 或者 -
/**
* division_model.js
*/
var router = express.Router();
router.route('/');
//omitting route code
router.route('/:division_id');
//omitting route code
return router;
/**
* server.js
*/
app.use('/division', division_model);
because you are exporting module with a function inside so you need to return your router at the end of your function at division_model.js因为您正在导出带有内部函数的模块,所以您需要在Division_model.js的函数末尾返回您的路由器
return router;
this should work这应该有效
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