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不保存到數(shù)據(jù)庫 Bantu saya memahami kesilapan saya

Pengawal

public function store(Request $request)
{
    $item = Cart::where('product_id', $request->product_id);

    if ($item->count()) {
        $item->increment('quantity');
        $item = $item->first();
    } else {
        $item = Cart::forceCreate([
            'product_id' => $request->product_id,
            'quantity' => 1,
        ]);
    }

    return response()->json([
        'quantity' => $item->quantity,
        'product' => $item->product
    ]);
}

Beli

addProductToCart (product, quantity) {
        axios.post('http://127.0.0.1:8000/api/cart', {
            product_id: product.id,
            quantity
        })
},

Item tidak ditambahkan ke pangkalan data apabila klik pada butang addItems (contohnya)