Question

当我添加＆＃34; {upsert：true}＆＃34;时，我收到此错误：

TypeError：callback.apply不是函数

// on routes that end in /users/competitorAnalysisTextData
// ----------------------------------------------------
router.route('/users/competitorAnalysisTextData/:userName')

    // update the user info (accessed at PUT http://localhost:8080/api/users/competitorAnalysisTextData)
    .post(function(req, res) {

        // use our user model to find the user we want
        User.findOne({ userName: req.params.userName}, function(err, user) {

            if (err)
                res.send(err);

            console.log('user.competitorAnalysis.firstObservation: %@', user.competitorAnalysis.firstObservation);
            // Got the user name
            var userName = user.userName;
            // update the text data
            console.log('Baobao is here!');
            user.update(
                {
                    userName: userName
                },
                { $set: { "competitorAnalysis.firstObservation" : req.body.firstObservation,
                          "competitorAnalysis.secondObservation" : req.body.secondObservation,
                          "competitorAnalysis.thirdObservation" : req.body.thirdObservation,
                          "competitorAnalysis.brandName" : req.body.brandName,
                          "competitorAnalysis.productCategory" : req.body.productCategory
                } },
                { upsert: true }
            );

            // save the user
            user.save(function(err) {
                if (err)
                    return res.send(err);

                return res.json({ message: 'User updated!' });
            });

        });
    })

没有这一行，就没有错误。我是nodejs的新手，不太确定问题出在哪里。

更新

现在没有错误消息，但数据库的这一部分未使用新数据进行更新。嵌入的文档仍然是空的。

// on routes that end in /users/competitorAnalysisTextData
// ----------------------------------------------------
router.route('/users/competitorAnalysisTextData/:userName')

// update the user info (accessed at PUT http://localhost:8080/api/users/competitorAnalysisTextData)
.post(function(req, res) {

    console.log('1');

    // Just give instruction to mongodb to find document, change it;
    // then finally after mongodb is done, return the result/error as callback.
    User.findOneAndUpdate(
        { userName : req.params.userName},
        {
            $set:
            {   "competitorAnalysis.firstObservation" : req.body.firstObservation,
                "competitorAnalysis.secondObservation" : req.body.secondObservation,
                "competitorAnalysis.thirdObservation" : req.body.thirdObservation,
                "competitorAnalysis.brandName" : req.body.brandName,
                "competitorAnalysis.productCategory" : req.body.productCategory
            }
        },
        { upsert: true },
        function(err, user) {
            // after mongodb is done updating, you are receiving the updated file as callback
            console.log('2');
            // now you can send the error or updated file to client
            if (err)
                return res.send(err);

            return res.json({ message: 'User updated!' });
        });

})

Answer 1

有两种方法可以更新mongodb中的文档：

找到该文档，将其带到服务器，进行更改，然后将其保存回mongodb。
只是给mongodb指令找到文件，改变它;然后在完成mongodb之后，将结果/错误作为回调返回。

在您的代码中，您将混合使用这两种方法。

使用user.save（），首先使用user.findOne搜索数据库，并将其拉到服务器（nodejs），现在它存在于您的计算机内存中。然后你可以手动更改数据，最后用user.save（）

将其保存到mongodb

User.findOne({ userName: req.params.userName}, function(err, user) {

    if (err)
        res.send(err);

    //this user now lives in your memory, you can manually edit it
    user.username = "somename";
    user.competitorAnalysis.firstObservation = "somethingelse";

    // after you finish editing, you can save it to database or send it to client
     user.save(function(err) {
        if (err)
            return res.send(err);

        return res.json({ message: 'User updated!' });
    });

第二个是使用User.findOneAndUpdate（）..这是首选，而不是user.findOne（）然后user.update（）;因为那些基本上两次搜索数据库。首先找到一个（），再次搜索更新（）

无论如何，第二种方法是告诉mongodb更新数据而不首先引入服务器，接下来，只有在mongodb完成其操作后，您才会收到更新文件（或错误）作为回调

User.findOneAndUpdate({ userName: req.params.userName}, 
            {
             $set: { "competitorAnalysis.firstObservation" : req.body.firstObservation,
                      "competitorAnalysis.secondObservation" : req.body.secondObservation,
                      "competitorAnalysis.thirdObservation" : req.body.thirdObservation,
                      "competitorAnalysis.brandName" : req.body.brandName,
                      "competitorAnalysis.productCategory" : req.body.productCategory
            } },
            { upsert: true },
        function(err, user) {
        //after mongodb is done updating, you are receiving the updated file as callback    

        // now you can send the error or updated file to client
        if (err)
            res.send(err);

        return res.json({ message: 'User updated!' });
        });

Answer 2

您忘记将回调传递给update方法

  user.update(                    
                    { $set: { "competitorAnalysis.firstObservation" : req.body.firstObservation,
                              "competitorAnalysis.secondObservation" : req.body.secondObservation,
                              "competitorAnalysis.thirdObservation" : req.body.thirdObservation,
                              "competitorAnalysis.brandName" : req.body.brandName,
                              "competitorAnalysis.productCategory" : req.body.productCategory
                    } },
                    { upsert: true },
function(err, result){}
                );

update方法需要3个参数。

文档更新
选项
回调

TypeError：callback.apply不是函数（Node.js＆amp; Mongodb）

2 个答案: