$parentFilter = null;
if ($filterType === 'book' || $filterType === 'page') {
$parentFilter = function (Builder $query) use ($filterType, $contextPage) {
if ($filterType === 'page') {
$query->where('uploaded_to', '=', $contextPage->id);
$parentFilter = null;
if ($filterType === 'book' || $filterType === 'page') {
$parentFilter = function (Builder $query) use ($filterType, $contextPage) {
if ($filterType === 'page') {
$query->where('uploaded_to', '=', $contextPage->id);