public function subscribe($slug)
{
$thread = Thread::whereSlug($slug)->firstOrFail();
$this->authorize('laraboard::thread-subscribe', $thread);
$sub = Subscription::updateOrCreate(['user_id' => \Auth::id(), 'post_id' => $thread->id], ['user_id' => \Auth::id(), 'post_id' => $thread->id]);
return redirect()->back()->with('success', 'Thread subscription created.');
}
