/**
* Find a discussion by ID, optionally making sure it is visible to a certain
* user, or throw an exception.
*
* @param integer $id
* @param \Flarum\Core\Models\User $user
* @return \Flarum\Core\Models\Discussion
*
* @throws \Illuminate\Database\Eloquent\ModelNotFoundException
*/
public function findOrFail($id, User $user = null)
{
$query = Discussion::where('id', $id);
return $this->scopeVisibleForUser($query, $user)->firstOrFail();
}
