Mongoose findByIdAndUpdate

Question

我尝试使用mongoose编辑和更新表单。代码对我来说似乎很好，但它不起作用。我尝试了许多方法，但更新的版本仍然相同，我使用put路由发送表单，当我将req.body.studentInfo输出到控制台时，它是正确的，但更新仍然是相同的。请帮帮忙

这是我的方案

var mongoose = require("mongoose");
var uniqueValidator = require('mongoose-unique-validator');
var passportLocalMongoose = require("passport-local-mongoose");
var mongoose = require("mongoose");

var UserSchema = new mongoose.Schema({
   studentInfo: {
   first_name: String,
   middle_name: String,
   last_name: String,
   street: String,
   town: String,
   city: String,
   region: String,
   country: String,
   studentId: String,
   day: Number,
   month: String,
   year: Number,
   },                   
   username: {type: String, required:true, unique:true},
   passport: String

});
UserSchema.plugin(uniqueValidator);
UserSchema.plugin(passportLocalMongoose);

module.exports = mongoose.model("StudentInfo", UserSchema);

这是我的App.js

app.put('/:id', function(req,res){
    StudentInfo.findByIdAndUpdate(req.params.id, {$set: req.body.studentInfo}, function(err, updated){
        console.log(req.params.id);
        console.log(req.body.studentInfo);
        if(err) {
            console.log(err);
        }
        else {
            res.redirect('/' + req.params.id);
        }
    });

});

The studentInfo is an object that contains the names of each variables in my form which I name was studentInfo[name of variable]. Please help

Answer 1

应该指定mongoose应该返回更新后的文档-默认情况下它返回原始文档(这也是mongodb的行为)。我认为如果代码改成这样：

StudentInfo.findByIdAndUpdate(req.params.id, {$set: req.body.studentInfo}, { new: true }, function(err, updated){
        ...
    });

您将在回调中收到更新后的文档。

Answer 2

正如@Denny在他的回答中提到的，mongoose不会在回调中返回更新后的文档，直到您传递{new : true }选项。有关详细信息和可用选项，请查看findByIdAndUpdate Docs