Addition to Laravel Daily's mini tutorial "Filament & Laravel: Delete Unused Files if Model is Updated/Deleted" - a "saved()" method that can handle the image field set to multiple

TaskObserver.php

 public function saved(Task $task): void
    {
        
        if ($task->isDirty('attachment')) {

            $originalFieldContents = $task->getOriginal('attachment');
            $newFieldContents = $task->attachment;

            # We attempt to JSON decode the field. If it is an array, this is an indication we have ->multiple() activated
            $originalFieldContentsDecoded = json_decode($task->getOriginal('attachment'));

            # Clean up empty entries in the resulting array
            if (is_array($originalFieldContentsDecoded)) $originalFieldContentsDecoded = array_filter($originalFieldContentsDecoded);

            # Simple case: one file 
            if (!is_array($originalFieldContentsDecoded) or count($originalFieldContentsDecoded) == 0)
            {
               Storage::disk('public')->delete($originalFieldContents);
            } 

            # Complex case: multiple files
            else 
            {               
                foreach ($originalFieldContentsDecoded as $originalFile) 
                 {
                    if (trim($originalFile) != null && !in_array($originalFile, $newFieldContents))
                     {
                        Storage::disk('public')->delete($originalFile);
                     }
                 }   
            }        
        }
    }



 public function deleted(Task $task): void
    {
        if (! is_null($task->attachment)) {

            # We attempt to JSON decode the field. If it is an array, there are multiple files
            $fieldContentsDecoded = json_decode($task->attachment);

            # Simple case: one file 
            if (!is_array($fieldContentsDecoded))
            {
               Storage::disk('public')->delete($task->attachment);
            } 

            # Complex case: multiple files
            else 
            {
               
                foreach ($fieldContentsDecoded as $file) 
                 {
                     Storage::disk('public')->delete($file);
                 }
            }
        }
    }

i updated the method and now it's woking for me otherwise i was getting error "json_decode(): Argument #1 ($json) must be of type string, array given"

        if (is_array($originalFieldContents)) {
            $originalFieldContentsDecoded = $originalFieldContents;
        } else {
            $originalFieldContentsDecoded = json_decode($originalFieldContents);
        }

i updated the method and now it's woking for me otherwise i was getting error "json_decode(): Argument #1 ($json) must be of type string, array given"

        if (is_array($originalFieldContents)) {
            $originalFieldContentsDecoded = $originalFieldContents;
        } else {
            $originalFieldContentsDecoded = json_decode($originalFieldContents);
        }

thank you, work like a charm

change line 10

           $originalFieldContentsDecoded = json_decode($task->getOriginal('attachment'));

with

        if (is_array($originalFieldContents)) {
            $originalFieldContentsDecoded = $originalFieldContents;
        } else {
            $originalFieldContentsDecoded = json_decode($originalFieldContents);
        }