20131004.dxreviewers.php
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	<?php

	$table = new DifferentialRevision();
	$conn_w = $table->establishConnection('w');

	// NOTE: We migrate by revision because the relationship table doesn't have
	// an "id" column.

	foreach (new LiskMigrationIterator($table) as $revision) {
	$revision_id = $revision->getID();
	$revision_phid = $revision->getPHID();

	echo "Migrating reviewers for D{$revision_id}...\n";

	$reviewer_phids = queryfx_all(
	$conn_w,
	'SELECT objectPHID FROM %T WHERE revisionID = %d
	AND relation = %s ORDER BY sequence',
	'differential_relationship',
	$revision_id,
	'revw');
	$reviewer_phids = ipull($reviewer_phids, 'objectPHID');

	if (!$reviewer_phids) {
	continue;
	}

	$editor = id(new PhabricatorEdgeEditor())
	->setActor(PhabricatorUser::getOmnipotentUser());

	foreach ($reviewer_phids as $dst) {
	if (phid_get_type($dst) == PhabricatorPHIDConstants::PHID_TYPE_UNKNOWN) {
	// At least one old install ran into some issues here. Skip the row if we
	// can't figure out what the destination PHID is. See here:
	// https://github.com/phacility/phabricator/pull/507
	continue;
	}

	$editor->addEdge(
	$revision_phid,
	PhabricatorEdgeConfig::TYPE_DREV_HAS_REVIEWER,
	$dst,
	array(
	'data' => array(
	'status' => DifferentialReviewerStatus::STATUS_ADDED,
	),
	));
	}

	$editor->save();
	}

	echo "Done.\n";