//UsersTable
$this->belongsToMany('Follower', [
            'className' => 'Users',
            'jointable' => 'users_followers',
            'foreignKey' => 'follower_id',
            'targetForeignKey' => 'followed_id'
        ]);
        $this->belongsToMany('Followed', [
            'className' => 'Users',
            'jointable' => 'users_followers',
            'foreignKey' => 'followed_id',
            'targetForeignKey' => 'follower_id'
        ]);