PhabricatorEdgesDestructionEngineExtension.php
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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) {
			try {
			$editor->removeEdge($edge['src'], $edge['type'], $edge['dst']);
			} catch (Exception $ex) {
			// We can run into an exception while removing the edge if the
			// edge type no longer exists. This prevents us from figuring out
			// if there's an inverse type. Just ignore any errors here and
			// continue, since the best we can do is clean up all the edges
			// we still have information about. See T11201.
			phlog($ex);
			}
			}
			}
			}

			$editor->save();
			}

			}