ldc-groupe/app/Http/Requests/Back/ModelAccessRequest.php

<?php

namespace App\Http\Requests\Back;

use App\Traits\Requests\Api\HasLaravelFailedValidation;
use Illuminate\Foundation\Http\FormRequest;

class ModelAccessRequest extends FormRequest
{
    use HasLaravelFailedValidation;

    /**
     * Determine if the user is authorized to make this request.
     *
     * @return boolean
     */
    public function authorize(): bool
    {
        return auth('backend')->check() and $this->ajax();
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array
     */
    public function rules(): array
    {
        return [
            'modelName'     => 'required|string|between:3,255|regex:/^[a-z]+(?:_[a-z]+)*$/',
            'selectedEntry' => "required|numeric|exists:{$this->input('modelName')},id",
        ];
    }
}