针对两个不同的数据库表进行身份验证

我对 Yii 2.0 中的身份验证过程有点困惑。我正在开发一个具有两种用户(学生和讲师(的 Web 应用程序。每个实体都有自己的数据库表(MySQL，如果这很重要(，有自己的ID，用户名和密码字段。我已经查看了高级应用程序模板，其中包括针对数据库的身份验证，但在这种情况下，用户表是唯一的。就我而言，我必须能够确定要查找用户记录的数据库表(学生或讲师(。标识接口：

interface IdentityInterface
{
    /**
    * Finds an identity by the given ID.
    * @param string|integer $id the ID to be looked for
    * @return IdentityInterface the identity object that matches the given ID.
    * Null should be returned if such an identity cannot be found
    * or the identity is not in an active state (disabled, deleted, etc.)
    */
    public static function findIdentity($id);
    /**
    * Finds an identity by the given token.
    * @param mixed $token the token to be looked for
    * @param mixed $type the type of the token. The value of this parameter depends on the implementation.
    * For example, [['yii'filters'auth'HttpBearerAuth]] will set this parameter to be `yii'filters'auth'HttpBearerAuth`.
    * @return IdentityInterface the identity object that matches the given token.
    * Null should be returned if such an identity cannot be found
    * or the identity is not in an active state (disabled, deleted, etc.)
    */
    public static function findIdentityByAccessToken($token, $type = null);
    /**
    * Returns an ID that can uniquely identify a user identity.
    * @return string|integer an ID that uniquely identifies a user identity.
    */
    public function getId();
    /**
    * Returns a key that can be used to check the validity of a given identity ID.
    *
    * The key should be unique for each individual user, and should be persistent
    * so that it can be used to check the validity of the user identity.
    *
    * The space of such keys should be big enough to defeat potential identity attacks.
    *
    * This is required if [[User::enableAutoLogin]] is enabled.
    * @return string a key that is used to check the validity of a given identity ID.
    * @see validateAuthKey()
    */
    public function getAuthKey();
    /**
    * Validates the given auth key.
    *
    * This is required if [[User::enableAutoLogin]] is enabled.
    * @param string $authKey the given auth key
    * @return boolean whether the given auth key is valid.
    * @see getAuthKey()
    */
    public function validateAuthKey($authKey);
}

包含不幸的是是静态的findIdentity()方法。我之所以这样说，是因为我在传递额外参数或从实现此接口的 app'models'User 类访问实例变量时遇到问题，该类将区分用户身份验证的数据库表。在我的情况下，findIdentity()中的$id参数不是唯一的。

我怎样才能找到解决方案？