HeraldProjectsField.php
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			<?php

			final class HeraldProjectsField extends HeraldField {

			const FIELDCONST = 'projects';

			public function getHeraldFieldName() {
			return pht('Project tags');
			}

			public function getFieldGroupKey() {
			return HeraldSupportFieldGroup::FIELDGROUPKEY;
			}

			public function supportsObject($object) {
			return ($object instanceof PhabricatorProjectInterface);
			}

			public function getHeraldFieldValue($object) {
			return PhabricatorEdgeQuery::loadDestinationPHIDs(
			$object->getPHID(),
			PhabricatorProjectObjectHasProjectEdgeType::EDGECONST);
			}

			protected function getHeraldFieldStandardType() {
			return self::STANDARD_PHID_LIST;
			}

			protected function getDatasource() {
			return new PhabricatorProjectDatasource();
			}

			}

phab/src/applications/project/herald/HeraldProjectsField.php6bfa23762d2dstable