public function acts($id)
 {
     $user = User::findOrFail($id);
     $members = ActivityMember::findByUser($user->id, 0);
     $members->merge(ActivityMember::findByUser($user->id, 1));
     $old_members = ActivityMember::findByUser($user->id, 2);
     return view('space.acts', compact('user', 'members', 'old_members'));
 }