/**
* Get the ID of a user with the given username.
*
* @param string $username
* @param \Flarum\Core\Models\User $user
* @return integer|null
*/
public function getIdForUsername($username, User $user = null)
{
$query = User::where('username', 'like', $username);
return $this->scopeVisibleForUser($query, $user)->pluck('id');
}
