如何在 Laravel Nova 中获取两个文本字段的总和并设置为另一个文本字段

Question

How can I get the sum of two text fields and set it to another text field when changing the value in Laravel Nova? I want to get Quantity x Unit_Price and set it to Amount.

SimpleRepeatable::make('Purchase Order Items', 'purchase_order_items', [
    Select::make('Purchase_Order_Id')
        ->options(\App\Models\PurchaseOrder::pluck('serial_number', 'id'))
        ->displayUsingLabels()->rules('required'),
    Select::make('Product_id')->options(\App\Models\Product::pluck('product_name', 'id'))
        ->displayUsingLabels()->rules('required'),
    Text::make('Quantity'),
    Text::make('Unit_Price'),
    Text::make('Amount'),
    Select::make('Variant_id')
        ->options(\App\Models\Variant::pluck('productName', 'id'))
        ->displayUsingLabels()->rules('required'),
])

Answer 1

hi maybe i understood it wrong, but you can delete amount from database and make atribute amount through accessor and then use it on your form and you can hide it from create and update

protected function amount(): Attribute
{
    return Attribute::make(
        get: fn() => $this->quantity*$this->unit_price,
    );
}

hope it helps

Answer 2

You can try this instead

SimpleRepeatable::make('Purchase Order Items', 'purchase_order_items', [
    Select::make('Purchase_Order_Id')
        ->options(\App\Models\PurchaseOrder::pluck('serial_number', 'id'))
        ->displayUsingLabels()->rules('required'),
    Select::make('Product_id')->options(\App\Models\Product::pluck('product_name', 'id'))
        ->displayUsingLabels()->rules('required'),

    Number::make('Quantity'),
    Number::make('Unit_Price'),
    Text::make('Amount', function ($model) {
        return $model->quantity + $model->unit_price;
    }),

    Select::make('Variant_id')
        ->options(\App\Models\Variant::pluck('productName', 'id'))
        ->displayUsingLabels()->rules('required'),
])

As you can see Text fields are replaced with Number fields so that you can sum 2 fields and show the result in computed Amount field.

You can take a look at computed fields definition.