Question

这是我的架构，我没有定义_id字段，所以它是由猫鼬创建的，其类型是ObjectId，这就是它在robo3T中的显示方式

/*  
  Copyright (c) 2020 Antonio Roldan 
  All rights reserved 
*/


import mongoose, { Schema } from 'mongoose'
import { IAlbum } from '../interfaces/IAlbum'

const albumSchema = new Schema({
  title: {
    type: String,
    required: true,
    minlength: 1,
    trim: true
  },
  authorId: { // We create an array to allow collaborations
    type: mongoose.Schema.Types.ObjectId
  },
  authorName: {
    type: String
  },
  coverUrl: { // Reference to album's image file stored in a gridFS collection
    type: String
  },
  genres: [{
    type: String,
    required: true,
    trim: true
  }],
  releaseDate: {
    type: Date,
    default: Date.now
  },
  isPremium: {
    type: Boolean,
    default: false
  }
})

export default mongoose.model < IAlbum > ('Album', albumSchema)

这里是我打电话的地方，请注意，我传递的是字符串而不是ObjectId，我尝试使用objectId仍然无法正常工作

public getAlbumTracks(albumId: string): Promise<any> {
        //TODO: Test this 
    return new Promise(async (resolve, reject) => {
      try{
        let albumData: any = {} // {album: {title: , author:, cover: }, tracks: [{title: , audio: }]}
        const albumDocument = await this.albumModel.findById(albumId)
        console.log('albumDocument :', albumDocument)
        const author = await this.userModel.findById(albumDocument.authorId)
        const albumTracks = await this.trackModel.find({album: albumDocument._id})
        albumData.tracks = albumTracks.map(track => {
          return {title: track.title, audio: track.trackUrl, isPremium: track.isPremium}
        })
        albumData.album = {title: albumDocument.title, author: author.username, cover: albumDocument.coverUrl}
        resolve(albumData)
      } catch(err) {
        reject({code: 500, msg: err.message || err.msg})
      }
    })
  }

Answer 1

您需要通过将输入ID（作为字符串）解析为ObjectId函数的参数，将其转换为ObjectID。这是一个猫鼬的样品。

    var mongoose = require('mongoose'); 
    var id = mongoose.Types.ObjectId(stringId);

然后您可以继续在id中使用findById(id)

猫鼬findById返回null，并且该ID作为对象ID存储在db

1 个答案: