ManiphestTaskProject.php
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	<?php

	/**
	* This is a DAO for the Task -> Project table, which denormalizes the
	* relationship between tasks and projects into a link table so it can be
	* efficiently queried. This table is not authoritative; the projectPHIDs field
	* of ManiphestTask is. The rows in this table are regenerated when transactions
	* are applied to tasks which affected their associated projects.
	*/
	final class ManiphestTaskProject extends ManiphestDAO {

	protected $taskPHID;
	protected $projectPHID;

	public function getConfiguration() {
	return array(
	self::CONFIG_IDS => self::IDS_MANUAL,
	self::CONFIG_TIMESTAMPS => false,
	);
	}

	public static function updateTaskProjects(
	ManiphestTask $task,
	array $new_phids) {

	$edge_type = PhabricatorProjectObjectHasProjectEdgeType::EDGECONST;

	$old_phids = PhabricatorEdgeQuery::loadDestinationPHIDs(
	$task->getPHID(),
	$edge_type);

	$add_phids = array_diff($new_phids, $old_phids);
	$rem_phids = array_diff($old_phids, $new_phids);

	if (!$add_phids && !$rem_phids) {
	return;
	}

	$editor = new PhabricatorEdgeEditor();
	foreach ($add_phids as $phid) {
	$editor->addEdge($task->getPHID(), $edge_type, $phid);
	}
	foreach ($rem_phids as $phid) {
	$editor->remEdge($task->getPHID(), $edge_type, $phid);
	}
	$editor->save();
	}

	}