0) {
foreach ($categories as $c) {
if ((int)($c['id'] ?? 0) === $selectedCategoryId) {
$selectedCat = $c;
break;
}
}
}
$editGmin = old('grade_min', $selectedCat['grade_min'] ?? '');
$editGmax = old('grade_max', $selectedCat['grade_max'] ?? '');
?>
Grade range is saved on the selected category (shared by all books in that category).