javascript - 发现 Sequelize 循环依赖

Question

当我尝试同步我的数据库时出现这个奇怪的错误:

Unhandled rejection Error: Cyclic dependency found. roles is dependent of itself.
Dependency chain: roles -> users => roles

我有以下称为 Permission 的联结表模型

const Permission = db.define('permission', {
    id: {
        type: type.INTEGER,
        primaryKey: true,
        autoIncrement: true
    },
    role_id: {
        type: type.INTEGER,
        references: {
            model: 'roles',
            key: 'id',
        }
    },
    resource_id: {
        type: type.INTEGER,
        references: {
            model: 'resources',
            key: 'id',
        }
    },
});

为什么会发生这个错误？我该如何解决？在我的 User 模型中， User 有一个 Role :

const User = db.define('user', {
    id: {
        type: Sequelize.INTEGER,
        primaryKey: true,
        autoIncrement: true
    },
    role_id : {
        type: Sequelize.INTEGER,
        references: {
            model: 'roles',
            key: 'id',
        }
    }
});

User.hasOne(Role)

编辑:这是我的 Angular 色模型:

const Role = db.define('role', {
    id: {
        type: Sequelize.INTEGER,
        primaryKey: true,
        autoIncrement: true
    },
    name: Sequelize.STRING,
})

module.exports = Role

Answer 1

在 Sequelize 文档中，它说:

The A.hasOne(B) association means that a One-To-One relationship exists between A and B, with the foreign key being defined in the target model (B)

这意味着，用户模型不应该有 Angular 色模型的外键。尝试将您的用户模型更改为:

const User = db.define('user', {
    id: {
        type: Sequelize.INTEGER,
        primaryKey: true,
        autoIncrement: true
    }

});

User.hasOne(Role)

然后你的 Angular 色模型:

const Role = db.define('role', {
    id: {
        type: Sequelize.INTEGER,
        primaryKey: true,
        autoIncrement: true
    },
    name: Sequelize.STRING,
    user_id : {
        type: Sequelize.INTEGER,
        references: {
            model: 'users',
            key: 'id',
        }
    }
 })

Role.belongsTo(User);    

module.exports = Role