插入数据透视表：ErrorException 未定义偏移量：0答案

【问题标题】：Inserting into pivot table: ErrorException Undefined offset: 0插入数据透视表：ErrorException 未定义偏移量：0
【发布时间】：2021-11-13 19:44:21
【问题描述】：

我正在尝试使用数组将数据插入数据透视表order_serrvice。我遵循以下代码：https://blog.quickadminpanel.com/master-detail-form-in-laravel-jquery-create-order-with-products/

订单控制器：

$order = Order::create($data);
$services = $request->input('services', []);
$quantities = $request->input('quantities', []);
for ($service = 0; $service < count($services); $service++) {
    if ($services[$service] != '') {
        $order->services()->attach($services[$service], ['quantity' => $quantities[$service]]);
    }
}

刀片页面：

<tbody>
    <tr id='addr0'>
        <td>1</td>
        <td>
            <select name="services[]" class="form-control">
            <option value="">-- choose service --</option>
            @foreach ($services as $service)
                <option value="{{ $service->id }}">
                    {{ $service->name }} (${{ number_format($service->price, 2) }})
                </option>
                @endforeach
            </select>
            {{--<input type="text" name='service[]'  placeholder='Enter Product Name' class="form-control"/>--}}
        </td>
        <td><input type="number" name='qty[]' placeholder='Enter Qty' class="form-control qty" step="0" min="0"/></td>
        <td><input type="number" name='price[]' placeholder='Enter Unit Price' class="form-control price" step="0.00" min="0"/></td>
        <td><input type="number" name='total[]' placeholder='0.00' class="form-control total" readonly/></td>
    </tr>
    <tr id='addr1'></tr>
</tbody>
</table>

与dd($request):

"services" => array:2 [▼
        0 => "1"
        1 => "2"
      ]
      "qty" => array:2 [▼
        0 => "27"
        1 => "2"
      ]
      "price" => array:2 [▼
        0 => "489"
        1 => "4"
      ]
      "total" => "23647.69"
      "sub_total" => "13211.00"
      "vat" => "10436.69"

dd($services[$service]):

"1"

错误：

ErrorException 未定义的偏移量：0 $order->services()->attach($services[$service], ['quantity' => $quantities[$service]]);

有人可以帮忙吗？

【问题讨论】：

您使用的是$request->input('quantities', [])，但您的表单有<input ... name='qty[]'。数量 != 数量。我投票结束这是一个错字。

标签： php arrays laravel

【解决方案1】：

而不是用isset检查空检查。你的 for 循环从 0 开始，所以最初它检查第零个值，你的数组没有那个索引。所以改变循环开始的迭代值

            for ($service=1; $service <= count($services); $service++) {
                            if (isset($services[$service])) {
                                $order->services()->attach($services[$service], ['quantity' => $quantities[$service]]);
                            }
                        }

【讨论】：

感谢您的回复，但这并不能解决它给我的错误，例如 ErrorException Undefined offset: 1
@SweetGarl 请打印 $services[$service] 一次，然后死去看看它的价值

【解决方案2】：

我修复了问题，这是一个简单的错误，我只是在 OrderController 中将 Quantity 替换为 qty

   $order = Order::create($data);
$services = $request->input('services', []);
$quantities = $request->input('qty', []);
for ($service = 0; $service < count($services); $service++) {
    if ($services[$service] != '') {
        $order->services()->attach($services[$service], ['qty' => $quantities[$service]]);
    }
}

【讨论】：