public function applyOnCollection(CollectionInterface $collection)
{
$newCollection = null;
foreach ($this->getAppliedGroups() as $group) {
if ($group['type'] == 'db') {
continue;
}
if (!$newCollection) {
$newCollection = $collection->groupBy(function ($item) use($group) {
return $item->{$group['field']};
});
} else {
$newCollection = $newCollection->each(function ($groupItems) use($group) {
return (new Collection($groupItems))->groupBy(function ($item) use($group) {
return $item->{$group['field']};
});
}, true);
}
}
return $newCollection ?? $collection;
}
