public function postCreate(Request $request)
 {
     DB::transaction(function () use($request) {
         $input = $request->input();
         $product = Product::create($input);
         $product->branches()->attach(1, ['stock' => $input['stock'], 'price' => $input['price']]);
         $request->file('photo')->move('resources/products', $product->id);
     });
     return redirect()->back()->with(['success' => ['Insertado correctamente']]);
 }