Exists validation not works properly with BelongsTo relationship and custom ownerKey

[feeh27]

• Laravel Version: 9.38.0
• Nova Version: 4.17.1
• PHP Version: 8.1.1
• Database Driver & Version: MariaDB 10.5
• Operating System and Version: Windows 11
• Browser type and version: Google Chrome 106.0.5249.119
• Reproduction Repository: https://github.com/###/###

Description:

When I try create a new register (Asset), the following message is returned: "The Entity field is required.".

Debugging I noticed that Laravel Nova sends the id for validation instead of the code field, which would be correct.

Detailed steps to reproduce the issue on a fresh Nova installation:

• Create a new Asset using Laravel Nova interface
• Configure models and resources as below:

I have a two models, entity and assets:

In my assets Model I've entity method with BelongsTo relationship.

public function entity(): BelongsTo
{
    return $this->belongsTo(
        Entity::class, // Eloquent model
        Asset::ENTITY_CODE, // Foreing key
        Entity::CODE, // Owner key
    );
}

In Entity Resource (Laravel Nova):

public function fields(NovaRequest $request): array
{
    return [
        ID::make()->sortable(),
        Text::make('Code')->hideWhenUpdating()->sortable(),
        Text::make('Name')->sortable(),
        Text::make('Description')->sortable(),
        BelongsTo::make('Entity Code', null, Entity::class)
                ->dontReorderAssociatables()
                ->withoutTrashed()
                ->sortable()
                ->hideWhenUpdating()
                ->creationRules('exists:entities,code'),
    ];
}

[crynobone]

Hi there,

Unfortunately, this is something that we are not able to support at the moment for various limitations and since it may can be solved with an upcoming feature I don't think it is worth it to complicate BelongsTo field at the moment. In the meantime I believe you can use the following:

BelongsTo::make('Entity Code', null, Entity::class)
  ->exceptOnForms()
  ->sortable(),

Select::make('Entity Code')
  ->options(function () {
    return \App\Models\Entity::query()->pluck('name', 'code');
  })->onlyOnForms()
  ->hideWhenUpdating()
  ->creationRules('exists:entities,code'),