Question

我在我正在编写的nodejs应用程序中使用mongodb。

在我的代码中运行插入后，我收到以下错误：ReferenceError：在/home/safeuser/lunchand/routes/talktomongo.js:17:7中未定义集合

据我所知，只需在集合中运行insert即可创建它！如果我在终端中手动打开mongo并运行show dbs我也从未在dbs列表中看到lunchand，只有本地和管理员。

这是我正在使用的代码。第17行是collection.insert的位置。任何帮助将不胜感激。

//Declarations
var mongo = require('mongodb'),
    Server = mongo.Server,
    Db = mongo.Db,
    server = new Server('localhost', 27017, {auto_reconnect: true}),
    db = new Db('lunchand', server);

//Open database
db.open(function(_err, _db) {
    if(!_err) {
        console.log("Connected to lunchand DB");
        db.collection('lunchers', {strict: true}, function(_err, _collection) {
            if(_err) {
                console.log("Lunchers collection doesn't exist! Let's fix that!");
                var testLuncher = {username:"username",pwd:"password",officeLocation:"Office Location",teams:"teams",shark: true};
                db.collection('lunchers', function(_err, _collection) {
                    collection.insert(testLuncher, {safe:true}, function(_err, _result) {});
                });
            } else {
                console.log("Oh it exists");
            }
        });
    } else {
        console.log("Error Connecting to Station DB: " + _err);
    }
});

Answer 1

尝试将集合的名称添加到对象中，如下所示：

db.collection("lunchers").insert(testLuncher,function(err, element){
                    console.log("element inserted");  
                  });

可能你的代码应该是这样的：

var mongo = require('mongodb'),
    Server = mongo.Server,
    Db = mongo.Db,
    server = new Server('localhost', 27017, {auto_reconnect: true}),
    db = new Db('lunchand', server);

//Open database
db.open(function(_err, _db) {
    if(!_err) {
        db.collection('lunchers', {strict: true}, function(_err, _collection) {
            if(_err) {
               var testLuncher = {username:"username",pwd:"password",officeLocation:"Office Location",teams:"teams",shark: true};
                db.collection("lunchers").insert(testLuncher,function(err, element){
                console.log("element inserted");  
              });


            } else {
                console.log("Oh it exists");
            }
        });
    } else {
        console.log("Error Connecting to Station DB: " + _err);
    }
});

Answer 2

我猜第17行应该是db.collection.insert(...或_collection.insert(...

插入mongodb时出现“未定义集合”错误

2 个答案: