app/Http/Resources/Contact/Contact.php

<?php

namespace App\Http\Resources\Contact;

use Illuminate\Http\Resources\Json\JsonResource;

/**
 * @extends JsonResource<\App\Models\Contact\Contact>
 */
class Contact extends JsonResource
{
    use ContactBase;

    /**
     * Transform the resource into an array.
     *
     * @param  \Illuminate\Http\Request $request
     * @return array
     */
    public function toArray($request)
    {
        return $this->toArrayInternal($request, $request->input('with') == 'contactfields');
    }
}