atcheck/app/Http/Controllers/User/UserAttendancesController.php

<?php

namespace App\Http\Controllers\User;

use App\Http\Controllers\Controller;
use Illuminate\Http\Request;
use Illuminate\Support\Facades\Auth;
use App\Exports\AttendanceExportView;
use App\Exports\AttendanceGroupedExportView;
use Maatwebsite\Excel\Facades\Excel;

use App\Subject;
use App\Classes;
use App\Attendance;

class UserAttendancesController extends Controller
{
    public function index($groupBy='classes_id')
    {
        $user_id = Auth::id();
        $subjects = Subject::where('user_id', $user_id)->get();
        $subjects_ids = $subjects->pluck('id')->toArray();
        $classes = Classes::whereIn('subject_id', $subjects_ids)->orderBy('created_at','DESC')->get();
        $classes_ids = $classes->pluck('id')->toArray();
        $attendances = Attendance::whereIn('classes_id', $classes_ids)->get();
        $attendances_grouped = $attendances->groupBy($groupBy);
        return view('user.user_attendances', ['attendances' => $attendances, 'attendances_grouped' => $attendances_grouped, 'classes' => $classes, 'grouped_by' => $groupBy]);
    }

    public function add_attendance(Request $request)
    {
        $classes_id = $request->input('classes_id');
        $student_id_number = $request->input('student_id');
        $student_name = $request->input('student_name');
        $student_surname = $request->input('student_surname');
        $seat_number = $request->input('seat_number');
        Attendance::create([
            'classes_id' => $classes_id,
            'student_id_number' => $student_id_number,
            'student_name' => $student_name,
            'student_surname' => $student_surname,
            'seat_number' => $seat_number,
        ]);
        return redirect(route('user_attendances'));
    }

    public function delete_attendance($attendance_id)
    {
        Attendance::find($attendance_id)->delete();
        return redirect(route('user_attendances'));
    }

    public function edit_attendance($attendance_id)
    {
        Attendance::find($attendance_id);
        return redirect(route('user_attendances'));
    }

    public function export($classes_id)
    {
        $classes_date = Classes::find($classes_id)->date;
        return Excel::download(new AttendanceExportView($classes_id), "classes-attendance-{$classes_date}.xlsx");
    }

    public function export_grouped($groupBy)
    {
        $today_date = date('Y-m-d');
        $groupByLabel = str_replace("_", "-", $groupBy);
        if($groupBy == 'classes_id') {
            $groupByLabel = 'classes_name';
        }
        return Excel::download(new AttendanceGroupedExportView($groupBy), "all-attendance-grouped-by-{$groupByLabel}-{$today_date}.xlsx");
    }

}