Which Hook to Use for Updating Entity A After Unlinking a B?

[alohatech]

I have two entities: A and B. Entity A has many Bs. I want to update a value in A after unlinking one B from the collection of Bs. Which hook should I use to accomplish this? Thank you

[emillod]

Hello alohatech
Here you have a list of hooks: Hooks - EspoCRM Documentation

Based on the description afterUnrelate seems the best.

[alohatech]

in the documentation afterUnrelate is used when two records are unrelated through a many-to-many relationship; I have one-to-many in my case

[alohatech]

Like this?

<?php
namespace Espo\Custom\Hooks\A;
use Espo\ORM\Entity;
use Espo\Core\Hooks\Base;
class AfterUnrelate extends \Espo\Core\Hooks\Base
{
public static $order = 10;
public function afterUnrelate(Entity $entity, array $options)
{

// Fetch all B records related to this A
$BList = $entity->get('Bs');
$total = 0; // Initialize as 0
// Sum the price values from all related Bs records
foreach ($BList as $B) {
$total += (float) $B->get('price');
}
// Update the total field in the A entity
$entity->set('total', $total);
}
}
​

[emillod]

You can check this hook:
espocrm/application/Espo/Modules/Crm/Hooks/Account/Contacts.php