Sequelize：“模型尚未定义”时，跨多个数据库的关系

Question

我正在尝试实例化每个数据库一个续集。DB1中的一些表与DB2中的表有关联，并与之相反。其中之一是DB1.Utilisateur.contenuProvenance_id => DB2.Contenu.id和DB2.Contenu.utilisateur_id => DB1.Utilisateur.id。

下面是使用者模型：

@Table
export default class Utilisateur extends Model<Utilisateur> {

    @API() @PrimaryKey @AutoIncrement @Column({ type: DataType.INTEGER })
    public id!: number;

    @Column({ type: DataType.STRING, allowNull: false })
    public email!: string;

    @Column({ type: DataType.STRING, allowNull: false })
    public nom!: string;

    @ForeignKey(() => Utilisateur)
    @Column({ type: DataType.INTEGER, allowNull: true })
    public parrain_id?: number;

    @ForeignKey(() => Contenu)
    @Column({ type: DataType.INTEGER, allowNull: true })
    public contenuProvenance_id?: number;
}

(是的，我正在使用后缀-类型记录来声明我的模型为类型记录类)

下面是如何创建我的后缀实例：

let DBs = {};
for (const ZONE of zones)
    DBs[ ZONE.name ] = new Sequelize(ZONE.serveur.bdd.nom, ZONE.serveur.bdd.login, ZONE.serveur.bdd.mdp, {
        host: ZONE.serveur.bdd.hote,
        dialect: "mariadb",
        ...
        models: ZONE.modeles // Array of models
    });

问题:当创建第一个实例(DB1)时，表并给出以下错误：

Error: Contenu has not been defined
    at Sequelize.model (project/node_modules/sequelize/lib/sequelize.js:443:13)
    at Sequelize.model (project/node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:29:26)
    at project/node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:51:46
    at Array.forEach (<anonymous>)
    at project/node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:49:26
    at Array.forEach (<anonymous>)
    at Sequelize.associateModels (project/node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:45:16)
    at Sequelize.addModels (project/node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:37:14)
    at new Sequelize (project/node_modules/sequelize-typescript/dist/sequelize/sequelize/sequelize.js:19:22)

虽然数据库之间有关系，但是否可以一个一个地创建后缀实例？

在创建了所有后缀实例之后，我应该添加模型吗？

谢谢你们的帮助

相关信息：

• SequelizeJS: How to include association (join) across multiple databases without using raw query

Answer 1

Sequalize不支持多个迁移文件夹，也不支持为单个模型设置的方法。你必须说得很具体。我看不出你是从你提供的东西来的。

看看这个问题是否有帮助：Migrations in Sequelize in my own folder structure您必须配置一种绕过默认路径的方法。

这也可能提供一些见解：https://medium.com/unetiq/using-multiple-databases-with-nodejs-and-sequelize-59e0abcbbe6f

您可以在这里阅读有关Sequalize迁移的详细信息：https://sequelize.org/master/manual/migrations.html#the-sequelizerc-file