20130201.revisionunsubscribed.php
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	<?php

	echo pht('Migrating Differential unsubscribed users to edges...')."\n";
	$table = new DifferentialRevision();
	$table->openTransaction();

	// We couldn't use new LiskMigrationIterator($table) because the $unsubscribed
	// property gets deleted.
	$revs = queryfx_all(
	$table->establishConnection('w'),
	'SELECT id, phid, unsubscribed FROM differential_revision');

	foreach ($revs as $rev) {
	echo '.';

	$unsubscribed = json_decode($rev['unsubscribed']);
	if (!$unsubscribed) {
	continue;
	}

	$editor = new PhabricatorEdgeEditor();
	foreach ($unsubscribed as $user_phid => $_) {
	$editor->addEdge(
	$rev['phid'],
	PhabricatorObjectHasUnsubscriberEdgeType::EDGECONST ,
	$user_phid);
	}
	$editor->save();
	}

	$table->saveTransaction();
	echo pht('Done.')."\n";