PhabricatorCalendarEventReplyTransaction.php
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	<?php

	abstract class PhabricatorCalendarEventReplyTransaction
	extends PhabricatorCalendarEventTransactionType {

	public function generateOldValue($object) {
	$actor_phid = $this->getActingAsPHID();
	return $object->getUserInviteStatus($actor_phid);
	}

	public function applyExternalEffects($object, $value) {
	$acting_phid = $this->getActingAsPHID();

	$invitees = $object->getInvitees();
	$invitees = mpull($invitees, null, 'getInviteePHID');

	$invitee = idx($invitees, $acting_phid);
	if (!$invitee) {
	$invitee = id(new PhabricatorCalendarEventInvitee())
	->setEventPHID($object->getPHID())
	->setInviteePHID($acting_phid)
	->setInviterPHID($acting_phid);
	$invitees[$acting_phid] = $invitee;
	}

	$invitee
	->setStatus($value)
	->save();

	$object->attachInvitees($invitees);
	}

	}