protected function generateCartesian(Product $product)
{
$attributeOptions = $product->getAttributeOptions();
$attributesArray = $attributeOptions->groupBy('attribute_group_id')->map(function (Collection $attributeOptionsByGroup) {
return $attributeOptionsByGroup->pluck('id');
})->toArray();
$result = [];
while (list($key, $values) = each($attributesArray)) {
if (empty($values)) {
continue;
}
if (empty($result)) {
foreach ($values as $value) {
$result[] = [$key => $value];
}
} else {
$append = [];
foreach ($result as &$product) {
$product[$key] = array_shift($values);
$copy = $product;
foreach ($values as $item) {
$copy[$key] = $item;
$append[] = $copy;
}
array_unshift($values, $product[$key]);
}
$result = array_merge($result, $append);
}
}
foreach ($result as &$array) {
sort($array);
}
return collect($result);
}
