Problem when I try to delete data and files - php

Question

I'm new in Laravel, and I'm doing a project for my university, and I've two problems when I try to delete:
First error: When I try to delete the records, only the first one (with ID 1) doesn't delete from the table, but the other if deleted from the table and I've already tried some things to fix the error, but I couldn't:
Controller.php:
public function destroy_int($inst_id)
{
$inst = InstitucionEntidadInt::where('id', $inst_id);
$inst->delete();
return redirect('/activities/cons_instituciones_int');
}
Web.php:
Route::delete('/delete_inst_int/{inst_id}', [InstEntController::class, 'destroy_int'])
->name('institucion_int.destroy');
Second error: In some forms, it's necessary to upload and save files in a database (so I save just the name in the database and the files are saved in the public path). And some of this input files are multiple, so I save the names in the database like a JSON (using the json_encode method):
//This is the way that I save the files
$files = [];
if ($request->hasFile('inst_docsoporteNac')) {
foreach ($request->file('inst_docsoporteNac') as $file) {
$name = time() . "_" . $file->getClientOriginalName();
$file->move(public_path('files/institucionesNac'), $name);
$files[] = $name;
}
}
$instentNact->docSoportes = json_encode($files);
So, I'm trying to implement the delete method and I need to delete the files from both places (from the DB and the public path), I don't know how I can do it and I've already tried some "solutions" that I read from some forums (like this).
Controller.php:
public function destroy_nac($inst_id)
{
$inst = InstEntNac::where('id', $inst_id);
$files = InstEntNac::where('id', $inst_id)->get('docSoportes');
foreach (json_decode($files) as $file) {
Storage::delete(public_path('files/institucionesNac/' . $file));
}
$inst->delete();
return redirect('/activities/cons_instituciones_nac');
}
This is the way that I'm using, but I'm getting an error "Object of class stdClass could not be converted to string".
I'll appreciate your solutions for these errors.

Answer 1

For the first error, you can add error handling using this code:
InstitucionEntidadInt::findOrFail($inst_id)->delete();
For the second error, json_decode returns by default stdClass object instead of array. You can tell the function to return array type with second boolean parameter setting it to true:
json_decode($files, true)
https://www.php.net/manual/en/function.json-decode.php