public function single(string $product, LangRequest $request): JsonResource 	{ 		$product = Product::includes($request->lang)->available()->where(function ($query) use ($product) { 			$query->where('id', $product) 				->orWhere('slug', $product) 				->orWhereHas('translations', function ($query) use ($product) { 					$query->where([ 						['column', 'slug'], 						['value', $product], 					]); 				}); 		})->firstOrFail();  		return new ProductSingleResource($product); 	}