制作一个由以下 2 个模型用户和民意调查组成的投票应用程序和由两个集合用户和民意调查组成的数据库。

用户.js

'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);

投票.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)

最佳答案

首先，您需要将 Poll 导入到您的路由文件中。

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

然后正如@numbers1311407 所描述的，如果你想返回所有已保存的 Poll 文档，请尝试:

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

编辑:

可以找到有关 module.exports 的更多信息 here

关于node.js - 显示 'db.get is not a function' NodeJs、MongoDB，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/38701123/