/**
* @return {array<string>} An array of related item keys
*/
private function getRelatedItems() {
$predicate = Zotero_Relations::$relatedItemPredicate;
$relations = $this->getRelations();
if (empty($relations->$predicate)) {
return [];
}
$relatedItemURIs = is_string($relations->$predicate)
? [$relations->$predicate]
: $relations->$predicate;
// Pull out object values from related-item relations, turn into items, and pull out keys
$keys = [];
foreach ($relatedItemURIs as $relatedItemURI) {
$item = Zotero_URI::getURIItem($relatedItemURI);
if ($item) {
$keys[] = $item->key;
}
}
return array_unique($keys);
}
public static function purge($libraryID)
{
$sql = "SELECT subject FROM relations " . "WHERE libraryID=? AND predicate!=? " . "UNION " . "SELECT object FROM relations " . "WHERE libraryID=? AND predicate!=?";
$uris = Zotero . DB . columnQuery($sql, array($libraryID, self::$deletedItemPredicate, $libraryID, self::$deletedItemPredicate), Zotero_Shards::getByLibraryID($libraryID));
if ($uris) {
$prefix = Zotero_URI::getBaseURI();
Zotero_DB::beginTransaction();
foreach ($uris as $uri) {
// Skip URIs that don't begin with the default prefix,
// since they don't correspond to local items
if (strpos($uri, $prefix) === false) {
continue;
}
if (preg_match('/\\/items\\//', $uri) && !Zotero_URI::getURIItem($uri)) {
self::eraseByURI($uri);
}
if (preg_match('/\\/collections\\//', $uri) && !Zotero_URI::getURICollection($uri)) {
self::eraseByURI($uri);
}
}
Zotero_DB::commit();
}
}
