node.js - Sequelize : throw new Error (`${this.name}.belongsToMany called with something that' s not a subclass of Sequelize. 模型

Question

在我的程序中:
电影.js

import  { DataTypes } from 'sequelize'
import Actor from './actor'
import ActorMovies from './actormovies'
import { sequelize } from '../../db/seq'

const Movie = sequelize.define('Movie', { name: DataTypes.STRING });
Movie.belongsToMany(Actor, { through: ActorMovies });

export default Movie

Actor .js

import { DataTypes } from 'sequelize'
import Movie from './movie'
import ActorMovies from './actormovies'
import { sequelize } from '../../db/seq'

const Actor = sequelize.define('Actor', { name: DataTypes.STRING });
Actor.belongsToMany(Movie, { through: ActorMovies });

export default Actor

Actor 电影.js

import { DataTypes } from 'sequelize'
import Movie from './movie'
import Actor from './actor'
import { sequelize } from '../../db/seq'

const ActorMovies = sequelize.define('ActorMovies', {
    MovieId: {
      type: DataTypes.INTEGER,
      references: {
        model: Movie, 
        key: 'id'
      }
    },
    ActorId: {
      type: DataTypes.INTEGER,
      references: {
        model: Actor, 
        key: 'id'
      }
    }
});

export default ActorMovies

它会抛出一个错误

throw new Error(`${this.name}.belongsToMany called with something that's not a subclass of Sequelize.Model

我想它可能在 movie.js 和 actor.js 中使用了不同的 Sequelize ，但我不确定。
有人已经看到类似的错误了吗？我搜索了几天没有任何合适的问题，如果有人可以帮助我真的很感激，
感谢 !

Answer 1

那是因为您试图在他们自己的文件中使用 .belongsToMany。
简单说明:当您需要其中一个模型文件时，其中之一尚未定义为 Sequelize 模型。
尝试将 index.js 文件用于您的模型文件夹。 Take a look at my answer there
您可以阅读@Dorian Jakov Stern Vukotic answer 。