Question

我无法弄清楚这有什么问题。有谁知道我为什么会收到这个错误？我使用Node，Express，MongoDB和Mongoose。

这里是代码，console.log()行只是为了调试，它们是抛出错误的原因。

// report view
app.get("/report", isLoggedIn, function(req, res){
    User.findById(req.user._id, function(err, foundUser){
        if(err){
            console.log(err);
            console.log(foundUser);
        } else {
            console.log(foundUser);
            console.log();
            console.log(foundUser.purchases[0].phrase);
            res.render("report.ejs", {user:foundUser});
        }
    });
});

这是MongoDB中的user文档：

{
    "_id" : ObjectId("59d4dc48fba3ef12437bf4b1"),
    "salt" : "30dd9c9942...",
    "hash" : "8c8c96d88a708...",
    "username" : "Christian Lewis",
    "email" : "email@email.com",
    "signupDate" : ISODate("2017-10-04T13:04:08.167Z"),
    "__v" : 6,
    "purchases" : [
        {
            "phrase" : "Porche 918 Spyder",
            "location" : "South Yarra"
        },
        {
            "phrase" : "Blinds",
            "location" : "United Kingdom"
        }
    ]
}

以下是控制台发出的所有内容：

{ _id: 59d4dc48fba3ef12437bf4b1,
  username: 'Christian Lewis',
  email: 'christianllewis@gmail.com',
  __v: 6,
  signupDate: 2017-10-04T13:04:08.167Z,
  purchases:
   [ { location: 'South Yarra', phrase: 'Porche 918 Spyder' },
     { location: 'United Kingdom', phrase: 'Blinds' } ] }

events.js:160
      throw er; // Unhandled 'error' event
      ^

TypeError: Cannot read property 'phrase' of undefined
    at /Volumes/Store/Lickety-Split/website/app.js:58:47
    at Query.<anonymous> (/Volumes/Store/Lickety-Split/website/node_modules/mongoose/lib/model.js:3841:16)
    at /Volumes/Store/Lickety-Split/website/node_modules/kareem/index.js:273:21
    at /Volumes/Store/Lickety-Split/website/node_modules/kareem/index.js:131:16
    at _combinedTickCallback (internal/process/next_tick.js:73:7)
    at process._tickCallback (internal/process/next_tick.js:104:9)

我无法找到答案，我无法发现错误，所以如果这是一个重复的问题我会道歉。谢谢你的帮助。

Answer 1

错误发生在这一行

console.log(foundUser.purchases[0].phrase);

这表明foundUser.purchases数组为空，但是根据您记录的数据，它不是。

您能否确认发布的数据实际上是正确的日志信息。

问题迭代MongoDB对象数组

1 个答案: