public function getFriends($pageNumber, $pageSize)
{
$mutualFriendships = Friendship::find()->where(['user_id' => $this->id, 'mutual' => true])->offset($pageNumber * $pageSize)->limit($pageSize)->all();
$friends = [];
foreach ($mutualFriendships as $friendship) {
$friend = $friendship->friend;
$friends[] = $friend;
}
return $friends;
}
