PhabricatorEdgesDestructionEngineExtension.php
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	<?php

	final class PhabricatorEdgesDestructionEngineExtension
	extends PhabricatorDestructionEngineExtension {

	const EXTENSIONKEY = 'edges';

	public function getExtensionName() {
	return pht('Edges');
	}

	public function destroyObject(
	PhabricatorDestructionEngine $engine,
	$object) {

	$src_phid = $object->getPHID();

	try {
	$edges = id(new PhabricatorEdgeQuery())
	->withSourcePHIDs(array($src_phid))
	->execute();
	} catch (Exception $ex) {
	// This is (presumably) a "no edges for this PHID type" exception.
	return;
	}

	$editor = new PhabricatorEdgeEditor();
	foreach ($edges as $type => $type_edges) {
	foreach ($type_edges as $src => $src_edges) {
	foreach ($src_edges as $dst => $edge) {
	$editor->removeEdge($edge['src'], $edge['type'], $edge['dst']);
	}
	}
	}
	$editor->save();
	}

	}