laravel 如何为 Eloquent 数据透视表上的额外字段设置值
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How can I set value for extra field on Eloquent pivot table
提问by AxlSmith
$recourse->pivot->field = 'value';
$recourse->pivot->field = 'value';
gives error: Indirect modification of overloaded property
给出错误：间接修改重载的属性
回答by Jarek Tkaczyk
pivotis available only in the context of a relation:
pivot仅在关系的上下文中可用：
// won't work
$model = Model::first();
$model->pivot; // null
// will work
$anotherModel = AnotherModel::first();
$relatedModel = $anotherModel->relation()->first();
$relatedModel->pivot; // Pivot object
But for what you are trying to do simply use additional param in the savemethod:
但是对于您要执行的操作，只需在save方法中使用附加参数：
$product = Product::find($item->id);
$order->product()->save($product, ['price' => 12.34]);
For existing relation:
对于现有关系：
$product = $order->product()->find($productId);
$product->pivot->price = 12.34;
$product->pivot->save();
// or
$order->product()->updateExistingPivot($productId, ['price'=>12.34]);
And I suggest you use productsfor that kind of relation in order to make it easier to read.
我建议你使用products这种关系，以便于阅读。
回答by Carlo V
You should save() the pivot itself.
您应该 save() 枢轴本身。
$order->pivot->price = '1.234';
$order->pivot->save();
