silverstripe-cms/code/model/SiteTreeFolderExtension.php

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<?php
class SiteTreeFolderExtension extends DataExtension {
/**
* Looks for files used in system and create where clause which contains all ID's of files.
*
* @returns String where clause which will work as filter.
*/
public function getUnusedFilesListFilter() {
$result = DB::query("SELECT DISTINCT \"FileID\" FROM \"SiteTree_ImageTracking\"");
$usedFiles = array();
$where = '';
$classes = ClassInfo::subclassesFor('SiteTree');
if($result->numRecords() > 0) {
while($nextResult = $result->next()) {
$where .= $nextResult['FileID'] . ',';
}
}
foreach($classes as $className) {
$query = singleton($className)->extendedSQL();
$ids = $query->execute()->column();
if(!count($ids)) continue;
foreach(singleton($className)->has_one() as $relName => $joinClass) {
if($joinClass == 'Image' || $joinClass == 'File') {
$fieldName = $relName .'ID';
$query = singleton($className)->extendedSQL("$fieldName > 0");
$query->distinct = true;
$query->select = array($fieldName);
$usedFiles = array_merge($usedFiles, $query->execute()->column());
} elseif($joinClass == 'Folder') {
// @todo
}
}
}
if($usedFiles) {
return "\"File\".\"ID\" NOT IN (" . implode(', ', $usedFiles) . ") AND (\"ClassName\" = 'File' OR \"ClassName\" = 'Image')";
} else {
return "(\"ClassName\" = 'File' OR \"ClassName\" = 'Image')";
}
return $where;
}
}