README

Nova Prefiller Field

A Laravel Nova field to prefill fields based on another field. Super Awesome!

When a source field (for example a BelongsTo relation) changes in a Nova form, the prefiller field looks up the selected model and fills itself with a value taken from that model — either an attribute or a method on it.

Installation

Install the package via Composer:

composer require marshmallow/prefiller-field

The package registers its service provider automatically through Laravel's package discovery, so there is nothing else to set up.

Usage

Use the prefiller fields inside a Nova resource's fields() method. Point each field at the source field with sourceField(), tell it which model to look up with sourceModel(), and choose the attribute or method to copy with prefillWith().

use Laravel\Nova\Fields\BelongsTo;
use Marshmallow\PrefillerField\PrefillerText;
use Marshmallow\PrefillerField\PrefillerCurrency;

public function fields(Request $request)
{
    return [
        BelongsTo::make('Product')->nullable()->searchable(),

        PrefillerText::make('Test', 'field_2')
            ->sourceField('product')
            ->sourceModel(\Marshmallow\Product\Models\Product::class)
            ->prefillWith('name'), // This can be a field or a method on your target resource

        PrefillerCurrency::make('Test 3', 'field_3')
            ->sourceField('product')
            ->sourceModel(\Marshmallow\Product\Models\Product::class)
            ->prefillWith('price')
            ->currency('EUR')
            ->default(0)
            ->nullable(),
    ];
}

Available methods

Every prefiller field inherits the standard Nova field methods plus the following helpers from the Prefillable trait:

Method	Description
`sourceField($source_field)`	The attribute of the field that triggers the prefill (for example the `BelongsTo` relation).
`sourceModel($source_model)`	The fully-qualified model class that is looked up when the source field changes.
`prefillWith($prefill_with)`	The attribute or method on the looked-up model whose value is used to prefill the field.
`allowUpdatingFilledFields()`	Re-check for new values even when the target field already has content (by default a filled field is left untouched).
`fieldType($type)`	Override the field type passed to the front-end component.

Extra methods

If you want the prefiller to check for new values, even if the target field is already filled with content, you can call the method allowUpdatingFilledFields().

Supported fields

Currently we have only implemented the Text and Currency fields because we needed them in a project for a customer. We will add more in the coming months. Feel free to send a pull request if you need another field for your project.

Marshmallow\PrefillerField\PrefillerText — extends Nova's Text field.
Marshmallow\PrefillerField\PrefillerCurrency — extends Nova's Currency field.

Security Vulnerabilities

If you discover any security related issues, please email stef@marshmallow.dev instead of using the issue tracker.

Credits

License

The MIT License (MIT). Please see the License File for more information.

marshmallow/prefiller-field

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