[Bug] Deleting last relation tries to update this record and throws an error

Bug report

What I did

I added a relationship with multiple fields. I can add multiple relationship records. When I delete a relationship record it works exept when I try to delete the last record. Then it tries to update this record with an empty parent Id, and thus throwing an error “Cannot insert the value NULL into column …”

What I expected to happen

Delete the record and not update with emtpy parent ID

Is it a bug in the latest version of Backpack?

Yes

Backpack, Laravel, PHP, DB version

When I run php artisan backpack:version the output is:

PHP VERSION:

PHP 7.4.21 (cli) (built: Jul 1 2021 16:09:23) ( NTS ) Copyright © The PHP Group Zend Engine v3.4.0, Copyright © Zend Technologies with Zend OPcache v7.4.21, Copyright ©, by Zend Technologies

LARAVEL VERSION:

v8.83.1@bddba117f8bce2f3c9875ca1ca375a96350d0f4d

BACKPACK VERSION:

5.0.6@2be4ff8407259f528a3541f0569ce156bab63165

[howest-ward]

Thanks, learned something today! I downloaded the changes as explained, removed the ‘force_delete’ => true and the problem is gone! Solved!

[pxpm]

Going to close, let’s keep the conversation in the PR thread if needed!

Thanks again @howest-ward