Sequelize-通过带有外键的表

Question

如果我的联接表的额外列是第三张表的外键（即options），则可以在查询中包括该表的其他列（即options.name，options.description ..）。 ）？

协会：

let User = sequelize.define('user', {
    id: {
      type: DataTypes.UUID,
      primaryKey: true,
      allowNull: false,
      defaultValue: DataTypes.UUIDV4
    }
  });
User.associate = models => {
    User.belongsToMany(
      models.mail_settings,
      {
        through: 'user_mail_settings',
        foreignKey: 'user_id'
      }
    );
}


let MailSettings = sequelize.define('mail_settings', {
    id: {
        type: DataTypes.UUID,
        primaryKey: true,
        allowNull: false,
        defaultValue: DataTypes.UUIDV4
    },
    name: {
        type: DataTypes.STRING(100)
    }
});

MailSettings.associate = (models) => {
    MailSettings.belongsToMany(
        models.user,
        {
          through: 'user_mail_settings',
          foreignKey: 'mail_settings_id'
        }
    )
};


 var PrivacyOptions = sequelize.define('mail_options', {
    id: {
        type: DataTypes.UUID,
        primaryKey: true,
        allowNull: false,
        defaultValue: DataTypes.UUIDV4
    }
});

var UserMailSettings = sequelize.define('user_mail_settings', {

});

UserMailSettings.associate = (models) => {
    UserMailSettings.belongsTo(
        models.mail_options,
        {
            foreignKey: 'fk_selection_user_mail_settings',
            targetKey: 'id'
        }
    )
};

我知道可以通过将其添加到我的用户查询中来获取该外键：

include: [{
    model: models.mail_settings,
    attributes: ['id', 'name'],
    through: {
      attributes: ['fk_selection_user_mail_settings']
    },
    where: {
      name: 'some_query_here'
    }
}]

但是我该如何更进一步，并从mail_options模型中获取更多列？