stagfe2/app/Models/HrSectionChange.php

<?php

namespace App\Models;

# use Illuminate\Database\Eloquent\Model;

class HrSectionChange extends Model
{
    protected $table = 'hr_section_change';

    public function hrSection()
    {
        return $this->hasOne(HrSection::class, 'id', 'hr_section_id');
    }

    public function getOldValue(){
        switch($this->change_type){
            case 'DATA': return $this->old_data;
            case 'STATUS': return $this->old_status;
            case 'PROPOSED_DATA': return $this->old_proposed_data;
            case 'PROPOSED_STATUS': return $this->old_proposed_status;
            default:
                return 'Unknown change type';
        }
    }

    public function getNewValue(){
        switch($this->change_type){
            case 'DATA': return $this->new_data;
            case 'STATUS': return $this->new_status;
            case 'PROPOSED_DATA': return $this->new_proposed_data;
            case 'PROPOSED_STATUS': return $this->new_proposed_status;
            default:
                return 'Unknown change type';
        }
    }
}