silverstripe-cms/code/Model/SiteTreeFolderExtension.php

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<?php
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namespace SilverStripe\CMS\Model;
use SilverStripe\Assets\File;
use SilverStripe\Assets\Folder;
use SilverStripe\Core\ClassInfo;
use SilverStripe\Core\Config\Config;
use SilverStripe\Core\Convert;
use SilverStripe\ORM\ArrayList;
use SilverStripe\ORM\DataExtension;
use SilverStripe\ORM\DataList;
use SilverStripe\ORM\DataObject;
use SilverStripe\ORM\DB;
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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.
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*/
public function getUnusedFilesListFilter()
{
// Add all records in link tracking
$usedFiles = DB::query("SELECT DISTINCT \"FileID\" FROM \"SiteTree_ImageTracking\"")->column('FileID');
// Get all classes that aren't folder
$fileClasses = array_diff_key(
ClassInfo::subclassesFor(File::class),
ClassInfo::subclassesFor(Folder::class)
);
// Search on a class-by-class basis
$classes = ClassInfo::subclassesFor(SiteTree::class);
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$schema = DataObject::getSchema();
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foreach ($classes as $className) {
// Build query based on all direct has_ones on this class
$hasOnes = Config::inst()->get($className, 'has_one', Config::UNINHERITED);
if (empty($hasOnes)) {
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continue;
}
$where = [];
$columns = [];
foreach ($hasOnes as $relName => $joinClass) {
if (in_array($joinClass, $fileClasses)) {
$column = $relName . 'ID';
$columns[] = $column;
$quotedColumn = $schema->sqlColumnForField($className, $column);
$where[] = "{$quotedColumn} > 0";
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}
}
// Get all records with any file ID in the searched columns
$recordsArray = DataList::create($className)->whereAny($where)->toArray();
$records = ArrayList::create($recordsArray);
foreach ($columns as $column) {
$usedFiles = array_unique(array_merge($usedFiles, $records->column($column)));
}
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}
// Create filter based on class and id
$classFilter = sprintf(
"(\"File\".\"ClassName\" IN (%s))",
implode(", ", Convert::raw2sql($fileClasses, true))
);
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if ($usedFiles) {
return "\"File\".\"ID\" NOT IN (" . implode(', ', $usedFiles) . ") AND $classFilter";
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} else {
return $classFilter;
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}
}
}