angularjs - Node.js 从返回未定义的 MongoDB 获取请求

Question

在尝试学习 MEAN 堆栈 Web 开发的同时，我正在尝试构建一个小型 Web 应用程序。

我有一个正在运行的 MongoDB，其中包含一个名为“contactlist”的集合，然后 Node.js/Express.js 服务器将访问此列表，以将信息检索到 JSON 对象中并将其传递通过 Angular Controller 。

var express = require('express');
var mongojs = require('mongojs');
var db = mongojs('contactlist', ['contactlist']);
var app = express();
const port = 80;

app.use(express.static(__dirname + "/public"));
app.get('/contactlist', function(req, res){
    console.log("I received a GET request")
    db.contactlist.find(function(err, docs){
        console.log("Getting data from db");
        console.log(docs);
        res.json(docs);
    });
    console.log("Returned data");
});

app.listen(port,'0.0.0.0');
console.log('Server running on port '+port);

包含的 Controller 代码

var myApp = angular.module('myApp',[]);

myApp.controller('AppCtrl',['$scope','$http',function ($scope,$http){
    console.log("Hello World")
    console.log("Getting data from server")
    $http.get('/contactList').success(function(response){
        console.log("I got the data I requested");
        $scope.contactList = response;
    })
}]);

来自服务器的日志:

C:\Users\savila\Documents\Code\contactListApp>node server
Server running on port 80
I received a GET request
Returned data
Getting data from db
undefined

Answer 1

您没有传递query 对象

传递空查询对象 {} 以获取所有项目

查找查询的语法

db.collection.find(query, projection)

检查文档以查找查询 find()

app.get('/contactlist', function(req, res){
    console.log("I received a GET request")
    db.contactlist.find({},function(err, docs){
        console.log("Getting data from db");
        console.log(docs);
        res.json(docs);
    });
    console.log("Returned data");
});