相关疑难解决方法(0)

我正在尝试更新具有两个主键的Model.

模型

namespace App;

use Illuminate\Database\Eloquent\Model;

class Inventory extends Model
{
    /**
     * The table associated with the model.
     */
    protected $table = 'inventories';

    /**
     * Indicates model primary keys.
     */
    protected $primaryKey = ['user_id', 'stock_id'];
...

移民

Schema::create('inventories', function (Blueprint $table) {
    $table->integer('user_id')->unsigned();
    $table->integer('stock_id')->unsigned();
    $table->bigInteger('quantity');

    $table->primary(['user_id', 'stock_id']);

    $table->foreign('user_id')->references('id')->on('users')
        ->onUpdate('restrict')
        ->onDelete('cascade');
    $table->foreign('stock_id')->references('id')->on('stocks')
        ->onUpdate('restrict')
        ->onDelete('cascade');
});

这是应该更新Inventory模型的代码,但它没有.

$inventory = Inventory::where('user_id', $user->id)->where('stock_id', $order->stock->id)->first();
$inventory->quantity += $order->quantity;
$inventory->save();

我收到此错误:

Illegal offset type

我也尝试使用updateOrCreate()方法.它不起作用(我得到同样的错误).

谁能告诉我们应该如何更新带有两个主键的Model？