顯示'db.get不是函數'NodeJs，MongoDB

Question

製作一個投票應用程序，該應用程序由以下兩個模型用戶和投票以及由兩個集合用戶和民意調查組成的數據庫組成。

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); 

，這是路由部分

'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'); 
    }) 

這是錯誤被拋出

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，您需要將Poll導入路由文件。

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

然後爲@ numbers1311407形容，如果你想返回所有已保存的文件投票嘗試：

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

編輯：

上module.exports的更多信息，可以發現here