我正在尝试从apiRoutes.get('/resources/productinfo/:name')获取一些数据，我有这个错误，我不知道哪里出错了...... apiRoutes.get('/book/:title')似乎没有用！我不知道我做错了什么
更新：
> TypeError: Cannot read property 'findOne' of undefined <br> at Object.module.exports.findBookByTitle
> (/home/themis/firstapp/api/config/database.js:22:26) <br>
> at /home/themis/firstapp/api/server.js:109:22 <br>
> at Layer.handle [as handle_request]
> (/home/themis/firstapp/api/node_modules/express/lib/router/layer.js:82:5)
> <br> at next
> (/home/themis/firstapp/api/node_modules/express/lib/router/route.js:100:13)
> <br> at Route.dispatch
> (/home/themis/firstapp/api/node_modules/express/lib/router/route.js:81:3)
> <br> at Layer.handle [as handle_request]
> (/home/themis/firstapp/api/node_modules/express/lib/router/layer.js:82:5)
> <br> at
> /home/themis/firstapp/api/node_modules/express/lib/router/index.js:234:24
> <br> at param
> (/home/themis/firstapp/api/node_modules/express/lib/router/index.js:331:14)
> <br> at param
> (/home/themis/firstapp/api/node_modules/express/lib/router/index.js:347:14)
> <br> at Function.proto.process_params
> (/home/themis/firstapp/api/node_modules/express/lib/router/index.js:391:3)
> <br> at
> /home/themis/firstapp/api/node_modules/express/lib/router/index.js:228:12
> <br> at Function.match_layer
> (/home/themis/firstapp/api/node_modules/express/lib/router/index.js:295:3)
> <br> at next
> (/home/themis/firstapp/api/node_modules/express/lib/router/index.js:189:10)
> <br> at
> /home/themis/firstapp/api/node_modules/express/lib/router/index.js:191:16
> <br> at Function.match_layer
> (/home/themis/firstapp/api/node_modules/express/lib/router/index.js:295:3)
> <br> at next
> (/home/themis/firstapp/api/node_modules/express/lib/router/index.js:189:10)
这是server.js
var express = require('express');
MongoClient = require('mongodb').MongoClient,
app = express(),
mongoUrl = 'mongodb://localhost:27017/firstapp';
var bodyParser = require('body-parser');
var morgan = require('morgan');
var mongoose = require('mongoose');
var passport = require('passport');
var redisClient = require('redis').createClient;
var redis = redisClient(6379, 'localhost');
var config = require('./config/database'); // get db config file
var User = require('./app/models/user'); // get the mongoose model
var Products = require('./app/models/products'); //get the mongoose model
var Makeissue = require('./app/models/makeissue'); //get the mongoose model
var port = process.env.PORT || 8080;
var jwt = require('jwt-simple');
var access = require('./config/database.js');
MongoClient.connect(mongoUrl, function(err, db) {
if (err) throw 'Error connecting to database - ' + err;
// get our request parameters
app.use(bodyParser.urlencoded({ extended: false }));
app.use(bodyParser.json());
// log to console
app.use(morgan('dev'));
// Use the passport package in our application
app.use(passport.initialize());
// demo Route (GET http://localhost:8080)
app.get('/', function(req, res) {
res.send('The API is at http://localhost:' + port + '/api');
});
// connect to database
mongoose.connect(config.database);
// pass passport for configuration
require('./config/passport')(passport);
// bundle our routes
var apiRoutes = express.Router();
// create a new user account (POST http://localhost:8080/api/signup)
apiRoutes.post('/signup', function(req, res) {
if (!req.body.name || !req.body.password || !req.body.email) {
res.json({success: false, msg: 'Please pass name and password and email.'});
} else {
var newUser = new User({
name: req.body.name,
password: req.body.password,
email: req.body.email
});
// save the user
newUser.save(function(err) {
if (err) {
return res.json({success: false, msg: 'Username already exists.'});
}
res.json({success: true, msg: 'Successful created new user.'});
});
}
});
// route to authenticate a user (POST http://localhost:8080/api/authenticate)
apiRoutes.post('/authenticate', function(req, res) {
User.findOne({
name: req.body.name
}, function(err, user) {
if (err) throw err;
if (!user) {
res.send({success: false, msg: 'Authentication failed. User not found.'});
} else {
// check if password matches
user.comparePassword(req.body.password, function (err, isMatch) {
if (isMatch && !err) {
// if user is found and password is right create a token
var token = jwt.encode(user, config.secret);
// return the information including token as JSON
res.json({success: true, token: 'JWT ' + token});
} else {
res.send({success: false, msg: 'Authentication failed. Wrong password.'});
}
});
}
});
});
apiRoutes.post('/book', function (req, res) {
if (!req.body.title || !req.body.author) res.status(400).send("Please send a title and an author for the book");
else if (!req.body.text) res.status(400).send("Please send some text for the book");
else {
access.saveBook(db, req.body.title, req.body.author, req.body.text, function (err) {
if (err) res.status(500).send("Server error");
else res.status(201).send("Saved");
});
}
});
apiRoutes.get('/book/:title', function (req, res) {
if (!req.param('title')) res.status(400).send("Please send a proper title");
else {
access.findBookByTitle(db, req.param('title'), function (book) {
if (!req.body.text) res.status(500).send("Server error");
else res.status(200).send(book);
});
}
});
apiRoutes.get('/productinfo' , function(req, res, next) {
Products.find( function (err, result) {
if (err) return console.error(err);
res.json(result);
});
});
apiRoutes.get('/resources/productinfo/:name' , function(req, res) {
if (!req.param('name')) res.status(400).send("Please send a proper name");
else{
access.findProductsByName(Products, req.param('name'), function(Products) {
if (!products) res.status(500).send("server error");
});
}
});
// create a new Product (POST http://localhost:8080/api/productsignup)
apiRoutes.post('/resources/productsignup', function(req, res) {
if (!req.body.name || !req.body.serialnumber) {
res.json({success: false, msg: 'Please pass name and serial number.'});
} else {
var newProducts = new Products({
name: req.body.name,
serialnumber: req.body.serialnumber
});
// save the Product
newProducts.save(function(err) {
if (err) {
return res.json({success: false, msg: 'Product already exists.'});
}
res.json({success: true, msg: 'Successful created new Product.'});
});
}
});
apiRoutes.post('/resources/createpost', function(req, res) {
if (!req.body.issue) {
res.json({success: false, msg: 'Please pass a issue.'});
} else {
var newMakeissue = new Makeissue({
issue: req.body.issue
});
// save the Product
newMakeissue.save(function(err) {
if (err) {
return res.json({success: false, msg: 'Post already exists.'});
}
res.json({success: true, msg: 'Successful created new post.'});
});
}
});
// route to a restricted info (GET http://localhost:8080/api/memberinfo)
apiRoutes.get('/memberinfo', passport.authenticate('jwt', { session: false}), function(req, res) {
var token = getToken(req.headers);
if (token) {
var decoded = jwt.decode(token, config.secret);
User.findOne({
name: decoded.name
}, function(err, user) {
if (err) throw err;
if (!user) {
return res.status(403).send({success: false, msg: 'Authentication failed. User not found.'});
} else {
res.json({success: true, msg: 'Welcome in the member area ' + user.name + '!'});
}
});
} else {
return res.status(403).send({success: false, msg: 'No token provided.'});
}
});
getToken = function (headers) {
if (headers && headers.authorization) {
var parted = headers.authorization.split(' ');
if (parted.length === 2) {
return parted[1];
} else {
return null;
}
} else {
return null;
}
};
// connect the api routes under /api/*
app.use('/api', apiRoutes);
module.exports = apiRoutes;
app.listen(8080, function() {
console.log('listening on port 8080');
});
});
和database.js
module.exports = {
'secret': 'di.ionio.gr',
'database': 'mongodb://localhost/firstapp'
};
module.exports.saveBook = function (db, title, author, text, callback) {
db.collection['text'].save({
title: title,
author: author,
text: text
}, callback);
};
module.exports.findBookByTitle = function (db, title, callback) {
db.collection['text'].findOne({
title: title
}, function (err, doc) {
if (err || !doc) callback(null);
else callback(doc.text);
});
};
module.exports.findProductsByName = function (db, name, callback) {
db.collection['products'].findOne({
name: name
}, function (err, doc) {
if (err || !doc) callback(null);
else callback(doc.products);
});
};
和package.json
{
"name": "firstapp",
"main": "server.js",
"dependencies": {
"bcrypt": "^0.8.5",
"body-parser": "~1.9.2",
"express": "~4.9.8",
"jwt-simple": "^0.3.1",
"mongoose": "~4.2.4",
"mongodb" : "~1.2.5",
"morgan": "~1.5.0",
"passport": "^0.3.0",
"passport-jwt": "^1.2.1",
"redis": "~0.10.1"
}
}
答案 0 :(得分：2)
incorect语法，你必须读取db.collection的属性，但你调用它。例如：
db.collection['products']!!!
db.collection['text'].save({
title: title,
author: author,
text: text
}, callback);
};
module.exports.findBookByTitle = function (db, title, callback) {
db.collection['text'].findOne({
title: title
}, function (err, doc) {
if (err || !doc) callback(null);
else callback(doc.text);
});
};
module.exports.findProductsByName = function (db, name, callback) {
db.collection['products'].findOne({
例如
var object = { 'some_value'：'value'， 'some_methid'：function（）{return'方法结果'} }
您可以阅读并设置属性'some_value'，例如：
object['some_value'] // return 'value'
object.some_value // return 'value'
//第2步
好的，在您的database.js方法中传递db变量，但这不是db实例，它是mongoose模型，你必须这样写：
module.exports.findBookByTitle = function (model, title, callback) {
model.findOne({
title: title
}, function (err, doc) {
if (err || !doc) callback(null);
else callback(doc.text);
});
};
module.exports.findProductsByName = function (model, name, callback) {
model.findOne({
name: name
}, function (err, doc) {
if (err || !doc) callback(null);
else callback(doc.products);
});
};
答案 1 :(得分：1)
您只能在文件中声明一次module.exports，因此您应该更改：
在您的database.js文件中：
module.exports.saveBook
到
exports.saveBook
等等
看看这个：https://www.sitepoint.com/understanding-module-exports-exports-node-js/
答案 2 :(得分：0)
"mongodb": "^2.2.33",
然后运行
npm install
一次。这将解决你的问题。
答案 3 :(得分：0)
确保在package.json文件中的脚本部分添加以下内容
"scripts": {
"test": "echo \"Error: no test specified\" && exit 1",
"start": "node server.js",
"dev": "nodemon server.js",
"debugger": "DEBUG=*:* npm run dev"
},