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/var/www/html/tpid-jsd/app/Http/Controllers/Section/AgendaController.php

<?php

namespace App\Http\Controllers\Section;

use App\Http\Controllers\Controller;
use App\Models\Agenda;
use App\Models\DetailAgenda;
use App\Models\Language;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\DB;
use Exception;

class AgendaController extends Controller
{
    public function index()
    {
        $languages = Language::get();
        $agendas = Agenda::with('details')->get()->groupBy('language_id');
        return view('section.agenda.index', compact('agendas', 'languages'));
    }

public function update(Request $request)
    {
        try {
            DB::beginTransaction();
            $post = $request->except('_token');
         
            DB::table('agendas')->delete();
            foreach ($post as $key => $agendas) {

foreach ($agendas as $agenda) {
                    $update_agenda = Agenda::updateOrCreate([
                        "id" => $agenda['agenda_id'],
                    ] , [
                        "language_id" => $key,
                        "name" => $agenda['name'],
                        "date" => $agenda['date'] ?? null,
                    ]);

foreach ($agenda['detail'] ?? [] as $detail) {
                        $update_detail = DetailAgenda::updateOrCreate([
                            "id" => $detail['detail_id'],
                        ] , [
                            "agenda_id" => $update_agenda['id'],
                            "hours" => $detail['hours'] ?? null,
                            "name" => $detail['title'] ?? null,
                            "description" => $detail['description'] ?? null,
                        ]);
                    }
                }
            }
            
            DB::commit();
            return redirect()->back()->withSuccess('Agenda has been updated');
        } catch (Exception $err) {
            DB::rollBack();
            return redirect()->route('agenda.index')->withErrors([$err->getMessage()]);
        }
    }
}