ospro-api-laravel/app/Models/UserToActivity.php

<?php

namespace App\Models;

use Illuminate\Database\Eloquent\Model;
use App\Models\Activity;

class UserToActivity extends Model
{
    protected $table = 'assign_hr_to_activity', $guarded = ['id'];

    const CREATED_AT = 'created_at';
    const UPDATED_AT = 'updated_at';

    public static function boot()
    {
        parent::boot();

        static::created(function ($data) {
            $activity = Activity::find($data->activity_id);
            $getWorkingHours = UserToProyek::where('user_id', $data->user_id)->where('proyek_id', $activity->proyek_id)->first();

            $salary = ($getWorkingHours->standart_rate * $activity->duration) * ($getWorkingHours->max_used / 100);

            if ($getWorkingHours->uom_standart_rate == "Hour")
                $salary = ($getWorkingHours->standart_rate * 8) * $activity->duration * ($getWorkingHours->max_used / 100);

            $activity->rencana_biaya += $salary;
            $activity->save();
        });

        static::deleted(function ($data) {
            $activity = Activity::find($data->activity_id);

            $getWorkingHours = UserToProyek::where('user_id', $data->user_id)->where('proyek_id', $activity->proyek_id)->first();
            $salary = ($getWorkingHours->standart_rate * $activity->duration) * ($getWorkingHours->max_used / 100);
            if ($getWorkingHours->uom_standart_rate == "Hour") {
                $salary = ($getWorkingHours->standart_rate * 8) * $activity->duration * ($getWorkingHours->max_used / 100);
            }

            $activity->rencana_biaya -= $salary;
            if ($activity->rencana_biaya < 0) {
                $activity->rencana_biaya = 0;
            }
            $activity->save();
        });
    }
}