Undefined variable $attendance_status using radio button laravel - laravel

Question

i am using laravel query builder but the problem is i am using radio buttons but i want to update the attendance at the radio button but it returns an error Undefined variable $attendance_status
i don't know why please help and how can i pass the $attendance_status variable
here is my code
my form
<form action="{{route('Attendances.update',$student->id)}}" method="post">
#csrf
#method('PUT')
<input type="hidden" name="id" value="{{$student->id}}">
<label class="block text-gray-500 font-semibold sm:border-r sm:pr-4">
<input name="attendences"
{{ $student->attendances()->first()->attendence_status == 1 ? 'checked' : '' }}
class="leading-tight" type="radio" value="presence">
<span class="text-success">حضور</span>
</label>
<label class="ml-4 block text-gray-500 font-semibold">
<input name="attendences"
{{ $student->attendances()->first()->attendence_status == 0 ? 'checked' : '' }}
class="leading-tight" type="radio" value="absent">
<span class="text-danger">غياب</span>
</label>
<div class="modal-footer">
<button type="button" class="btn btn-secondary"
data-dismiss="modal">{{trans('Students_trans.Close')}}</button>
<button class="btn btn-danger">{{trans('Students_trans.submit')}}</button>
</div>
</form>
here is my controller
update
public function update(Request $request, $id)
{
// return $request;
if($request->attendances == 'absent'){
$attendance_status = 0;
}
else if($request->attendances == 'presence'){
$attendance_status = 1;
}
Attendance::find($id)->update([
'student_id'=> $id,
'grade_id'=> $request->grade_id,
'class_id'=> $request->classroom_id,
'section_id'=> $request->section_id,
'attendance_date'=> date('Y-m-d'),
'status' => $attendance_status,
]);
return back();

Answer 1

You have an if and an elseif in your Controller, so only 2 conditions would create a variable named $attendance_status. You probably want to add a default branch, else basically, to make sure that the variable gets created with some default value before you try to use it in your update call.
Not sure which one of those 2 options you want to be the default but this would simplify things:
$attendance_status = $request->attendences == 'presence';

Answer 2

https://laravel.com/docs/9.x/redirects#redirecting-with-flashed-session-data
You may use the withInput method provided by the RedirectResponse instance to flash the current request's input data to the session before redirecting the user to a new location. Once the input has been flashed to the session, you may easily retrieve it during the next request:
return back()->withInput();

Answer 3

Surely {{ $student->attendances()->first()->attendence_status == 0 ? 'checked' : '' }} logic does not work in this way.
try this instead
<input name="attendences" checked="{{ $student->attendances()->first()->attendence_status == 0 ? true : false}}" class="leading-tight" type="radio" value="absent">