猫鼬推送到数组

Posted 2023-03-10

【中文标题】猫鼬推送到数组

【英文标题】：mongoose push to array

【发布时间】：2019-10-13 09:35:06

【问题描述】：

我需要将一个对象推入一个数组到数据库中，但我得到一个错误。我究竟做错了什么 ？找到了这样一个话题Push items into mongo array via mongoose但是不能正常申请 ..................................................... ..................................................... ....................

habalka.files.push(_id: "tata", destination: "Harry");
    habalka.save((res) => 
      console.log(res)
    );

当我尝试这段代码时，我得到了这个答案

MongooseError: 文档在保存之前必须有一个 _id

数据库

 "_id": "78935e75-86c0-47c2-a76d-2b52a0a71e7c",
    "files": [
        
            "_id": "67e848e5-7fb0-480b-a1d3-f3a09d1b57f7",
            "destination": "./uploads/78935e75-86c0-47c2-a76d-2b52a0a71e7c",
            "filename": "67e848e5-7fb0-480b-a1d3-f3a09d1b57f7.mp3",
            "path": "uploads\\78935e75-86c0-47c2-a76d-2b52a0a71e7c\\67e848e5-7fb0-480b-a1d3-f3a09d1b57f7.mp3",
            "folder": "78935e75-86c0-47c2-a76d-2b52a0a71e7c",
            "info": 
                "size": 12120000,
                "mimetype": "audio/mp3",
                "encoding": "7bit",
                "originalname": "Попрошайка Евгений Владимирович из ФАСП. Выпуск 10.mp3",
                "fieldname": "selectedFile"
            ,
            "date": 
                "$date": "2019-05-23T01:07:27.122Z"
            
        
    ],
    "date": 
        "$date": "2019-05-23T01:07:27.123Z"
    ,
    "__v": 0

架构

const mongoose = require('mongoose');
const Schema = mongoose.Schema;

const HabalkaSchema = new Schema(
  _id: 
    type: String
  ,
  files: [
    
      _id: 
        type: String
      ,
      destination: 
        type: String
      ,
      filename: 
        type: String
      ,
      path: 
        type: String
      ,
      folder: 
        type: String
      ,
      info: 
        size: 
          type: Number
        ,
        mimetype: 
          type: String
        ,
        encoding: 
          type: String
        ,
        originalname: 
          type: String
        ,
        fieldname: 
          type: String
        ,
      ,
      date: 
        type: Date,
        default: Date.now
      
    
  ],
  date: 
    type: Date,
    default: Date.now
  
);
module.exports = Habalka = mongoose.model('habalka', HabalkaSchema);

请求

let Habalka = habalka.findOne(_id: "78935e75-86c0-47c2-a76d-2b52a0a71e7c");
Habalka.files.push(destination: "Harry");
Habalka.save();

【参考方案1】：

我相信你的问题应该是files

我会试试的

habalka.update(
_id: "78935e75-86c0-47c2-a76d-2b52a0a71e7c",
$push:  files: destination: "Harry" 
);

【讨论】：

让 Habalka = habalka.findOne(_id: "78935e75-86c0-47c2-a76d-2b52a0a71e7c"); Habalka.files.push(files: destination: 'tata'); Habalka.save();我有同样的问题

habalka.update( _id: "78935e75-86c0-47c2-a76d-2b52a0a71e7c", $push: files: destination: "Harry" );此代码没有发生错误，但没有向数据库写入任何内容。

您是在等待还是在回电？也许您可以显示实际进行更新的nodejs代码

router.post('/post', upload.single('selectedFile'), (req, res) => let habalka = new Habalka(); // 78935e75-86c0-47c2- a76d-2b52a0a71e7c habalka.update( _id: "78935e75-86c0-47c2-a76d-2b52a0a71e7c", $push: files: destination: "Harry" ); )

【参考方案2】：

我找到了这个解决方案和这个工作。

Habalka.findById("78935e75-86c0-47c2-a76d-2b52a0a71e7c")
  .then(post => 
    console.log(post)
    post.files.unshift(_id: "tata", destination: "vava");
    post.save().then(res => console.log(res));
  )
  .catch(err => res.status(404).json( postnotfound: 'No post found' ));