Export Excel in Laravel - laravel

Question

**I have a problem with passing parameters on export file, I want to filter the export according to date selected on page. Hope you help me with this issue. Thanks **
This is my ExportController, I request data from form to my controller to give the export collection a date.
namespace App\Http\Controllers;
use Illuminate\Http\Response;
use Illuminate\Http\Request;
use App\Exports\ExportAttendance;
use Maatwebsite\Excel\Facades\Excel;
class ExportController extends Controller
{
public function export(Request $request)
{
return Excel::download(new ExportAttendance($request->input('min'),$request->input('max')),'Attendance.xlsx');
}
}
This is my ExportAttendance.php, this is responsible for the exportation of collections. On the query function I want to filter the data according on the date requested on the controller. How could I passed a data from controller to my Export.php, I did used constructors but it always return errors.
public function headings():array{
return[
'Name',
'In (AM)',
'Out (AM)',
'In (PM)',
'Out (PM)',
'Meeting',
'Task',
'Note',
'Total Hours',
'Date'
];
}
public function query()
{
$start = "2021-06-14";
$end = "2021-06-14";
return Attendance::select('Name','InAm','OutAM','InPM','OutPM','Meeting','SpecialTask','Undertime','TotalHours','Date')->whereBetween('Date',[$start,$end]);
}
public function collection()
{
return Attendance::all();
}
public function map($attendance):array
{
return[
$attendance->Name,
$attendance->InAM,
$attendance->OutAM,
$attendance->InPM,
$attendance->OutPM,
$attendance->Meeting,
$attendance->SpecialTask,
$attendance->Undertime,
$attendance->TotalHours,
$attendance->Date,
];
}

Answer 1

Instead of passing the $request object to the export class. You can simply use the request helper method.
public function query()
{
return Attendance::select('Name','InAm','OutAM','InPM','OutPM','Meeting','SpecialTask','Undertime','TotalHours','Date')
->whereBetween('Date',[request('start'), request('end')]);
}
Passing parameters is supposed to work too. Pls let me know what errors you see so I can update my answer.
I used Constructor
public function query()
{
$start = "2021-06-14";
$end = "2021-06-14";
return Attendance::select('Name','InAm','OutAM','InPM','OutPM','Meeting','SpecialTask','Undertime','TotalHours','Date')->where('Date','=',$this->year);
}
And this is my controller,
public function export(Request $request)
{
ob_start();
$datestart = $request->input('min');
$datestart = ob_get_contents();
return Excel::download(new ExportAttendance($datestart),'Attendance.xlsx');
ob_end_flush();
}
Another problem arise, when I used ob_end_clean() all my variable values returned nulls.