mongoose - Artist.findOne不是函数

Question

我在FindArtist.js文件中运行以下代码时，在Electron应用程序中出现错误:

const Artist = require('../models/artist');

/**
 * Finds a single artist in the artist collection.
 * @param {string} _id - The ID of the record to find.
 * @return {promise} A promise that resolves with the Artist that matches the id
 */
module.exports = _id => {
  return Artist.findOne({ _id: _id });
};

我肯定安装了 Mongoose ，但似乎我不再适本地导入 Mongoose 或Artist模型？没有把握。

这是 models/artist.js文件:

const mongoose = require('mongoose');
const AlbumSchema = require('./album');
const Schema = mongoose.Schema;

const ArtistSchema = new Schema({
  name: String,
  age: Number,
  yearsActive: Number,
  image: String,
  genre: String,
  website: String,
  netWorth: Number,
  labelName: String,
  retired: Boolean,
  albums: [AlbumSchema]
});

const Artist = mongoose.model('artist', ArtistSchema);

module.exports = ArtistSchema;

Answer 1

我发现module.exports文件上的models/artist.js错误。

代替:

// const Artist = mongoose.model('artist', ArtistSchema);

// module.exports = ArtistSchema;

应该是这样的:

module.exports = mongoose.model('artist', ArtistSchema);