ManiphestTaskParentTransaction.php
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	<?php

	final class ManiphestTaskParentTransaction
	extends ManiphestTaskTransactionType {

	const TRANSACTIONTYPE = 'parent';

	public function generateOldValue($object) {
	return null;
	}

	public function shouldHide() {
	return true;
	}

	public function applyExternalEffects($object, $value) {
	$parent_phid = $value;
	$parent_type = ManiphestTaskDependsOnTaskEdgeType::EDGECONST;
	$task_phid = $object->getPHID();

	id(new PhabricatorEdgeEditor())
	->addEdge($parent_phid, $parent_type, $task_phid)
	->save();
	}

	public function validateTransactions($object, array $xactions) {
	$errors = array();

	$with_effect = array();
	foreach ($xactions as $xaction) {
	$task_phid = $xaction->getNewValue();
	if (!$task_phid) {
	continue;
	}

	$with_effect[] = $xaction;

	$task = id(new ManiphestTaskQuery())
	->setViewer($this->getActor())
	->withPHIDs(array($task_phid))
	->executeOne();
	if (!$task) {
	$errors[] = $this->newInvalidError(
	pht(
	'Parent task identifier "%s" does not identify a visible '.
	'task.',
	$task_phid));
	}
	}

	if ($with_effect && !$this->isNewObject()) {
	$errors[] = $this->newInvalidError(
	pht(
	'You can only select a parent task when creating a '.
	'transaction for the first time.'));
	}

	return $errors;
	}
	}