def add_to_cart(request, product_id, quantity):
if int(quantity) > 0:
product = MenuItem.objects.get(id=product_id)
cart = Cart(request)
batch_item = Menu.get_current_menu().itembatch_set.get(item=product)
if batch_item.amount >= int(quantity) + int(cart.get_qty(product)):
cart.add(product, product.retailer_price(request.session['user']), quantity)
request.session['quantity_error'] = None
request.session['quantity_error_item'] = None
return JsonResponse({"return": "ok"})
else:
request.session['quantity_error'] = batch_item.amount
request.session['quantity_error_item'] = product.name
return JsonResponse({"return": "fail"})
