我已經(jīng)通過(guò)inventory_id 對(duì)列價(jià)格組求和。此外，我需要計(jì)算總價(jià)。$record = ProductDetails::with('inventoryName')->whereDate('created_at', '=', date($date))      ->select('inventory_id',DB::raw('sum(price) as item_price'),DB::raw('sum(quantity) as quantity'))->groupBy('inventory_id')->get();我的輸出是：[  {    inventory_id: 9,    item_price: 30,    quantity: 30,    inventory_name: [      {        id: 9,        name: "sugar"      }    ]  },  {    inventory_id: 10,    item_price: 70,    quantity: 70,    inventory_name: [      {        id: 10,        name: "oil"      }    ]  }]現(xiàn)在我需要計(jì)算總價(jià)。如何做到這一點(diǎn)。