Question

我在用户和角色之间具有关系N：M，也有一个名为UserRole的关联，其中存储了一些属性和两个外键：user_id和role_id。我的目标是将UserRole中的user_id设置为主。

用户模型：

module.exports = (sequelize, DataTypes) => {
    const User = sequelize.define('User', {
        // attributes
    }, {
        underscored: true,
        hooks: {
           beforeCreate: hashPassword,
           beforeUpdate: hashPassword
        }
    })

    User.associate = ({User, Role, UserRole}) => {
        User.belongsToMany(Role, {
            through: UserRole, 
            foreignKey: {
                name: 'user_id',
                allowNull: false
            }
        })
    }

    return User
}

角色模型：

module.exports = (sequelize, DataTypes) => {
    const Role = sequelize.define('Role', {
        // attributes
    }, {
        underscored: true
    })

    Role.associate = ({Role, User, UserRole}) => {
        Role.belongsToMany(User, {
            through: UserRole, 
            foreignKey: {
                name: 'role_id',
                allowNull: false
            }
        })
    }

    return Role
}

UserRole模型：

module.exports = (sequelize, DataTypes) => {
    const UserRole = sequelize.define('UserRole', {
        id: {
            type: DataTypes.INTEGER,
            allowNull: false,
            autoIncrement: true,
            unique: true,
            primaryKey: true
        },
        // rest of attributes
     }, {
         underscored: true
     })

    return UserRole
}

如果如上所述进行设置，则会收到带有该代码的表UserRole：

CREATE TABLE IF NOT EXISTS "UserRoles" (
    "id"   SERIAL UNIQUE , 
    "is_valid" BOOLEAN NOT NULL DEFAULT true,
    "assigned_at" TIMESTAMP WITH TIME ZONE NOT NULL,
    "revoked_at" TIMESTAMP WITH TIME ZONE,
    "created_at" TIMESTAMP WITH TIME ZONE NOT NULL,
    "updated_at" TIMESTAMP WITH TIME ZONE NOT NULL,
    "user_id" INTEGER NOT NULL REFERENCES "Users" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
    "role_id" INTEGER NOT NULL REFERENCES "Roles" ("id") ON DELETE CASCADE ON UPDATE CASCADE,
    UNIQUE ("user_id", "role_id"), PRIMARY KEY ("id")
);

但这不是我的目标。我尝试过在id模型中删除UserRole属性，并在User模型中进行设置：

User.belongsToMany(Role, {
    through: UserRole, 
    foreignKey: {
        name: 'user_id',
        allowNull: false,
        primaryKey: true
    }
})

但是后来我同时收到user_id和role_id作为PK。是否有可能仅将一个外键设置为识别主键？或者，也许我没有正确理解N：M关联？在此先感谢您的帮助。

Sequelize BelongsToMany将foreignKey设置为primaryKey

0 个答案: