/**
* Sync a piece of activity so that it is present for the specified users,
* and not present for anyone else.
*
* @param \Flarum\Core\Activity\ActivityInterface $activity
* @param \Flarum\Core\Models\User[] $users
* @return void
*/
public function sync(ActivityInterface $activity, array $users)
{
Activity::unguard();
$attributes = ['type' => $activity::getType(), 'subject_id' => $activity->getSubject()->id, 'time' => $activity->getTime()];
$toDelete = Activity::where($attributes)->get();
$toInsert = [];
foreach ($users as $user) {
$existing = $toDelete->where('user_id', $user->id)->first();
if ($k = $toDelete->search($existing)) {
$toDelete->pull($k);
} else {
$toInsert[] = $attributes + ['user_id' => $user->id];
}
}
if (count($toDelete)) {
Activity::whereIn('id', $toDelete->lists('id'))->delete();
}
if (count($toInsert)) {
Activity::insert($toInsert);
}
}
