lpj/app/Http/Requests/JenisLegalitasJaminanRequest.php

<?php

    namespace Modules\Lpj\Http\Requests;

    use daengdeni\LaravelIdGenerator\IdGenerator;
    use Illuminate\Foundation\Http\FormRequest;
    use Illuminate\Support\Str;

    class JenisLegalitasJaminanRequest extends FormRequest
    {
        /**
         * Get the validation rules that apply to the request.
         */
        public function rules()
        : array
        {
            return [
                'code' => 'required|max:6',
                'name' => 'required|max:255',
                'slug' => 'required|max:255',
            ];
        }

        /**
         * Determine if the user is authorized to make this request.
         */
        public function authorize()
        : bool
        {
            return true;
        }

        public function prepareForValidation()
        {
            if($this->method() == 'POST'  && $this->code == null) {
                $this->merge([
                    'code' => IdGenerator::generate(
                        ['table' => 'jenis_legalitas_jaminan', 'length' => 6, 'prefix' => 'JLJ', 'field' => 'code'],
                    ),
                    'slug' => Str::slug($this->name),
                ]);
            } else {
                $this->merge([
                   'slug' => Str::slug($this->name),
                ]);
            }
        }
    }