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Folder Deletion Fix Summary

Problem Description​

When importing new objects with a UUID that was previously deleted from the system, the following error occurred:

Multiple nodes found in oc_filecache with name equal to object uuid: 81efcfa2-25ca-4cd5-a320-6b9efad2eb04

This happened because:

  1. When the original object was created, ObjectService.php and FileService.php created a folder
  2. During the delete object phase, the folder wasn't deleted (only soft deleted)
  3. When reusing the same UUID, the system found multiple folders with the same name

Root Cause​

The folder deletion was incomplete:

  • Soft deletes (objects marked as deleted but not removed) kept folders intact
  • Hard deletes (permanent removal) didn't clean up the object folders
  • Multiple folders with the same UUID name caused conflicts during import

Solution Implemented​

1. Enhanced Folder Deletion for Hard Deletes​

File: lib/Service/ObjectHandlers/DeleteObject.php

Added folder deletion to the hard delete process:

/**
 * Delete the object folder when performing hard delete
 *
 * @param ObjectEntity $objectEntity The object entity to delete folder for
 *
 * @return void
 */
private function deleteObjectFolder(ObjectEntity $objectEntity): void
{
    try {
        $folder = $this->fileService->getObjectFolder($objectEntity);
        if ($folder !== null) {
            $folder->delete();
            $this->logger->info('Deleted object folder for hard deleted object: ' . $objectEntity->getId());
        }
    } catch (\Exception $e) {
        // Log error but don't fail the deletion process
        $this->logger->warning('Failed to delete object folder for object ' . $objectEntity->getId() . ': ' . $e->getMessage());
    }
}

Changes:

  • Added deleteObjectFolder() method to handle folder cleanup
  • Integrated folder deletion into the main delete() method
  • Added proper error handling to prevent deletion failures
  • Added logging for successful deletions and errors

2. Improved Multiple Folder Handling​

File: lib/Db/FileMapper.php

Changed error handling to pick the oldest folder instead of throwing an error:

// Before: Throw error on multiple folders
} elseif ($count > 1) {
    throw new \RuntimeException('Multiple nodes found in oc_filecache with name equal to object uuid: ' . $uuid);
}

// After: Pick oldest folder (lowest fileid)
} elseif ($count > 1) {
    // Multiple folders found with same UUID - pick the oldest one (lowest fileid)
    // TODO: Add nightly cron job to cleanup orphaned folders and logs
    usort($rows, function($a, $b) {
        return (int) $a['fileid'] - (int) $b['fileid'];
    });
    $oldestNodeId = (int) $rows[0]['fileid'];
    return $this->getFiles($oldestNodeId);
}

Changes:

  • Replaced error throwing with intelligent folder selection
  • Sort folders by fileid (creation order) to pick the oldest
  • Added TODO comment for future cleanup improvements

3. Added Cleanup TODO​

File: lib/Service/ObjectService.php

Added TODO comment for future nightly cleanup implementation:

public function delete(array | JsonSerializable $object): bool
{
    // TODO: Add nightly cron job to cleanup orphaned folders and logs
    // This should scan for folders without corresponding objects and clean them up
    return $this->deleteHandler->delete($object);
}

Files Modified​

Core Files​

  1. lib/Service/ObjectHandlers/DeleteObject.php - Added folder deletion for hard deletes
  2. lib/Db/FileMapper.php - Improved multiple folder handling
  3. lib/Service/ObjectService.php - Added cleanup TODO

Dependencies Added​

  • LoggerInterface - Added to DeleteObject for proper error logging

Database Impact​

No database schema changes required. The fixes work with existing data structures.

API Changes​

No API changes. The fixes are internal improvements that maintain backward compatibility.

Testing Scenarios​

The fixes address the following scenarios:

✅ Hard Delete with Folder Cleanup​

  • Object is permanently deleted
  • Associated folder is automatically removed
  • No orphaned folders left behind

✅ Multiple Folder Resolution​

  • Import with previously used UUID
  • System picks oldest folder instead of erroring
  • Import completes successfully

✅ Error Handling​

  • Folder deletion failures don't break object deletion
  • Proper logging for debugging
  • Graceful degradation

Future Improvements​

Nightly Cleanup Cron Job​

The TODO comment indicates the need for a nightly cleanup job that should:

  1. Scan for orphaned folders - Find folders without corresponding objects
  2. Clean up orphaned logs - Remove audit trails for non-existent objects
  3. Report cleanup statistics - Log what was cleaned up
  4. Handle edge cases - Deal with partially deleted objects

Implementation Suggestions​

// Example cleanup job structure
class CleanupService
{
    public function cleanupOrphanedFolders(): array
    {
        // Find folders without objects
        // Delete orphaned folders
        // Return cleanup statistics
    }
    
    public function cleanupOrphanedLogs(): array
    {
        // Find logs for non-existent objects
        // Clean up orphaned audit trails
        // Return cleanup statistics
    }
}

Deployment Instructions​

  1. Deploy the code changes to production
  2. Test import functionality with previously deleted UUIDs
  3. Verify hard deletes clean up folders properly
  4. Monitor logs for any folder deletion issues
  5. Plan nightly cleanup job implementation

Impact​

This fix resolves the import error and ensures:

  • ✅ Import functionality works with reused UUIDs
  • ✅ Hard deletes clean up all associated resources
  • ✅ No orphaned folders left in the system
  • ✅ Better error handling for edge cases
  • ✅ Foundation for future cleanup automation

The solution maintains backward compatibility while improving the robustness of the deletion and import processes.