显示“db.get不是函数”NodeJs，MongoDB

制作一个投票应用程序，其中包括以下两个模型的用户和民意测验，数据库由两个收集用户和民意调查组成。

user.js的

'use strict'; var mongoose = require('mongoose'); var Schema = mongoose.Schema; var User = new Schema({ github: { id: String, displayName: String, username: String, publicRepos: Number }, nbrClicks: { clicks: Number } }); module.exports = mongoose.model('User', User); 

Poll.js

 'use strict'; var mongoose = require('mongoose'); var Schema = mongoose.Schema; var Poll = new mongoose.Schema({ title: { type: String, required: true }, creator: String, choices: [String], votes: [Number] }); module.exports = mongoose.model('Poll', Poll); 

这是路线的一部分

 'use strict'; require('dotenv').load(); var path = process.cwd(); var ClickHandler = require(path + '/app/controllers/clickHandler.server.js'); var mongo = require('mongodb'); var mongoose = require('mongoose'); var db = mongoose.createConnection(process.env.MONGO_URI); module.exports = function (app, passport) { function isLoggedIn (req, res, next) { if (req.isAuthenticated()) { return next(); } else { res.redirect('/login'); } } var clickHandler = new ClickHandler(); app.route('/').get(isLoggedIn, function (req, res) { //console.log(display-name.profile-value); res.render(path + '/public/index.jade'); }); app.route('/polls').get(function(req, res) { var polls = db.get('polls'); console.log(polls); res.render(path + '/public/polls.jade'); }) 

这是抛出的错误

 TypeError: db.get is not a function at /home/ubuntu/workspace/app/routes/index.js:39:22 at Layer.handle [as handle_request] (/home/ubuntu/workspace/node_modules/express/lib/router/layer.js:95:5) at next (/home/ubuntu/workspace/node_modules/express/lib/router/route.js:131:13) at Route.dispatch (/home/ubuntu/workspace/node_modules/express/lib/router/route.js:112:3) at Layer.handle [as handle_request] (/home/ubuntu/workspace/node_modules/express/lib/router/layer.js:95:5) at /home/ubuntu/workspace/node_modules/express/lib/router/index.js:277:22 at Function.process_params (/home/ubuntu/workspace/node_modules/express/lib/router/index.js:330:12) at next (/home/ubuntu/workspace/node_modules/express/lib/router/index.js:271:10) at SessionStrategy.strategy.pass (/home/ubuntu/workspace/node_modules/passport/lib/middleware/authenticate.js:325:9) at SessionStrategy.authenticate (/home/ubuntu/workspace/node_modules/passport/lib/strategies/session.js:71:10) at attempt (/home/ubuntu/workspace/node_modules/passport/lib/middleware/authenticate.js:348:16) at authenticate (/home/ubuntu/workspace/node_modules/passport/lib/middleware/authenticate.js:349:7) at Layer.handle [as handle_request] (/home/ubuntu/workspace/node_modules/express/lib/router/layer.js:95:5) at trim_prefix (/home/ubuntu/workspace/node_modules/express/lib/router/index.js:312:13) at /home/ubuntu/workspace/node_modules/express/lib/router/index.js:280:7 at Function.process_params (/home/ubuntu/workspace/node_modules/express/lib/router/index.js:330:12) at next (/home/ubuntu/workspace/node_modules/express/lib/router/index.js:271:10) at initialize (/home/ubuntu/workspace/node_modules/passport/lib/middleware/initialize.js:53:5) at Layer.handle [as handle_request] (/home/ubuntu/workspace/node_modules/express/lib/router/layer.js:95:5) at trim_prefix (/home/ubuntu/workspace/node_modules/express/lib/router/index.js:312:13) at /home/ubuntu/workspace/node_modules/express/lib/router/index.js:280:7 at Function.process_params (/home/ubuntu/workspace/node_modules/express/lib/router/index.js:330:12) 

Answer 1

首先，您需要将Poll导入路由文件。

 var Poll = require('./PATH_TO_POLL/Poll'); 

然后，如@ numbers1311407所述，如果你想返回所有保存的民意调查文件，请尝试：

 Poll.find(function (err, polls) { if (err) return console.error(err); console.log(polls); }) 

编辑：

关于module.exports的更多信息可以在这里find