/**
* finds a user from storage based on ID and returns a User object located
* in memory. Normally this kind of logic will be implemented using the Repository pattern.
* However the important part is in mapRowToUser() below, that will create a business object from the
* data fetched from storage
*
* @param int $id
*
* @return User
*/
public function findById(int $id) : User
{
$result = $this->adapter->find($id);
if ($result === null) {
throw new \InvalidArgumentException("User #{$id} not found");
}
return $this->mapRowToUser($result);
}
