Node.js错误：Route.get（）需要回调函数，但是得到了[object Undefined]

Question

您好，我知道这个问题在stackoverflow中很常见，但是我所有人都通过了这个问题，我真的无法理解我的代码有什么问题。

这是我的主要server.js

 var dbUri = process.env.MONGODB_URI; var app = express(); var PORT = process.env.PORT || 3001; var bodyParser = require('body-parser'); var mongoose = require('mongoose'); app.use(express.static(path.join(__dirname, 'public'))); app.use(bodyParser.json()); app.use(bodyParser.urlencoded({ extended: true })); if (app.settings.env === 'development') { dbUri = 'mongodb://localhost/barsDb'; } mongoose.connect(dbUri, function (err, res) { if (err) { console.log('Erorr connection to database ' + dbUri + '.' + err); } else { console.log('Connected to database on ' + dbUri + "\\n"); } }); //app.use(require('./routes.bars')); require('./routes.bars')(app); //error here reciving undefined // connect to server app.listen(PORT, function () { console.log('Listening to port ' + PORT + '...'); }); 

这些是我的routes.js

 var bars = require('./controllers/controller.bar'); var mongoose = require('mongoose'); module.exports = function(app) { app.route('/').get(bars.getMain); //error in this line it is returning undefinded. app.route('/bars').get(bars.getBars); app.route('/bars').post(bars.addBar); app.route('/bars/:id').put(bars.updateBarById); app.route('/bars/:loc').get(bars.getByLocation); app.route('/bars/:id').get(bars.getBarById); app.route('/bars/:id').delete(bars.deletBarById); }; 

这是我的控制器：

 var mongoose = require('mongoose'); var dbModel = require('./../model/bars.db'); var path = require('path'); var _ = require('underscore'); // main page module.getMain = function (req, res) { res.sendFile(path.join(__dirname + "/../public/index.html")); }; // post new bar module.addBar = function (req, res) { var body = _.pick(req.body,'name', 'address', 'phone', 'barType', 'ambient', 'options', 'loc'); console.log(body); var newBar = new dbModel(body); newBar.save(function (err) { if (err) throw err; //res.send('Bar Created'); res.status(201).send(); }); }; // get all bars module.getBars = function (req, res) { dbModel.find({},function (err, bars) { if (err) throw err; res.json(bars); //res.status(200).send(); }); }; //get bars by location module.getByLocation = function (req, res) { var barLoc = req.params.loc.split(","); var barLocLon = parseFloat(barLoc[0]);//.toFixed(5); var barLocLat = parseFloat(barLoc[1]);//.toFixed(5); barLoc = []; barLoc.push(barLocLon); barLoc.push(barLocLat); dbModel.find({ loc: {$gt:[barLocLon - 0.0200, barLocLat - 0.0200], $lt:[barLocLon + 0.0200, barLocLat + 0.0200]} }, function (err, bars) { if (err) throw err; res.json(bars); res.status(200).send(); }); }; // get bar by id: module.getBarbyId = function (req, res) { var barId = req.params.id; dbModel.findById(barId, function (err, bar) { if (err) throw err; res.json(bar); res.status(200).send(); }); }; // update bar by id: module.updateBarById = function (req, res) { var barId = req.params.id; var body = _.pick(req.body,'name', 'address', 'phone', 'barType', 'ambient', 'options', 'loc'); dbModel.findById(barId, function (err, bar) { if (bar) { bar.save(function (err) { if (err) throw err; }); } }); dbModel.findByIdAndUpdate(barId, {$set:req.body}, function (err, bar) { if (err) throw err; res.send('Updated'); }); }; // delete bar by id: module.deleteBarById = function (req, res) { var barId = req.params.id; //console.log(barId); dbModel.findByIdAndRemove(barId, function (err) { if (err) throw err; res.send('Deleted id ' + barId); }); }; 

Answer 1

这样包装您的功能。

var myFunctions = {
    // get bar by id:
    getBarbyId: function (req, res) {
        var barId = req.params.id;
        dbModel.findById(barId, function (err, bar) {
            if (err) throw err;
            res.json(bar);
            res.status(200).send();
        });
    },

    // update bar by id:
    updateBarById: function (req, res) {
        var barId = req.params.id;
        var body = _.pick(req.body, 'name', 'address', 'phone', 'barType', 'ambient', 'options', 'loc');
        dbModel.findById(barId, function (err, bar) {
            if (bar) {

                bar.save(function (err) {
                    if (err) throw err;
                });
            }
        });
        dbModel.findByIdAndUpdate(barId, {
            $set: req.body
        }, function (err, bar) {
            if (err) throw err;
            res.send('Updated');
        });
    },

    // delete bar by id:
    deleteBarById: function (req, res) {
        var barId = req.params.id;
        //console.log(barId);
        dbModel.findByIdAndRemove(barId, function (err) {
            if (err) throw err;
            res.send('Deleted id ' + barId);
        });
    }
}

module.exports = myFunctions;

现在，您可以像这样使用“控制器”：

var myControllerFuncs = require('path/controller.js');

//myControllerFuncs.updateBarById...