scrum-poker-internal/app/Http/Requests/JoinRoomRequest.php

<?php

namespace App\Http\Requests;

use App\Models\Player;
use App\Models\Room;
use Illuminate\Contracts\Validation\ValidationRule;
use Illuminate\Foundation\Http\FormRequest;
use Illuminate\Validation\Rule;

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

    protected function prepareForValidation(): void
    {
        $this->merge([
            'join_code' => strtoupper(trim((string) $this->input('join_code'))),
            'player_name' => trim((string) $this->input('player_name')),
        ]);
    }

    /**
     * Get the validation rules that apply to the request.
     *
     * @return array<string, ValidationRule|array<mixed>|string>
     */
    public function rules(): array
    {
        $roomId = Room::query()
            ->where('join_code', $this->input('join_code'))
            ->value('id');

        return [
            'join_code' => ['bail', 'string', 'required', 'size:6', Rule::exists(Room::class, 'join_code')],
            'player_name' => ['required', 'string', 'max:50', Rule::unique(Player::class, 'name')->where('room_id', $roomId)],
        ];
    }

    public function messages(): array
    {
        return [
            'join_code.exists' => 'Dieser Raumcode existiert nicht.',
            'join_code.size' => 'Der Raumcode muss aus sechs Zeichen bestehen.',
            'player_name.unique' => 'Dieser Name wird in dem Raum bereits verwendet.',
        ];
    }
}