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Filename : AllStudentExport.php
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<?php

namespace App\Exports;

use App\SmStudent;
use Illuminate\Support\Facades\Auth;
use Maatwebsite\Excel\Concerns\WithHeadings;
use Maatwebsite\Excel\Concerns\FromCollection;


class AllStudentExport implements FromCollection,WithHeadings
{
    public function headings():array{
        if (moduleStatusCheck('University')) {
            return[
                'Admission Number',
                'Full Name',
                'Faculty (Department)',
            ];
        } else {
            return[
                'Admission Number',
                'Full Name',
                'Class (Section)',
            ];
        }

    }

    /**
    * @return \Illuminate\Support\Collection
    */

    public function collection()
    {
        $all_student_data = [];
        $student_infos = SmStudent::where('school_id', Auth::user()->school_id)
                  
                  
                    ->with('studentRecords')
                    ->select('admission_no', 'first_name', 'last_name', 'id')
                    ->get();
        
        foreach ($student_infos as $student_info) {
            $data= [];
            foreach ($student_info->studentRecords as $record) {
                if (moduleStatusCheck('University')) {
                     $data[] = $record->unFaculty->name.'('. $record->unDepartment->name .'),' ;
                } else {
                     $data[] = $record->class->class_name." (". $record->section->section_name . ")";
                }
            }
            $classSection = implode(', ', $data);
            $all_student_data[] = [
                $student_info->admission_no,
                $student_info->full_name,
                $classSection,
                
            ];
        }
      
        return collect($all_student_data);
    }
}