/**
* @param $slackId
* @param $title
* @param $url
* @return Link
*/
public static function fromSlack(UserId $slackId, $name, $email, $image)
{
$user = new User();
$user->slackId = $slackId->getValue();
$user->name = $name;
$user->email = $email;
$user->image = $image;
return $user;
}
/**
* @param UserId $userId
* @return User|null
*/
public function findOneBySlackId(UserId $userId)
{
return $this->findOneBy(array('slackId' => $userId->getValue()));
}