[Bug] Backpack v5 breaks morphTo select field

Bug report

What I did

I have a n-1 polymorphic relationship between “Intros” and “Companies” or “People”. Meaning an intro can link a user to either a company or a person. I have an ‘introable_id’ column in the intros table that points to the related model. The relationship is defined on App\Models\Intro as:

public function introable() { return $this->morphTo(); }

I have been using the select2 (1-n) relationship field in Laravel Backpack v4 without issues by just hardcoding the model that I want to default to from Backpack:

$this->crud->addField([  // Select2
            'label'     => "Intro To",
            'type'      => 'select2',
            'name'      => 'introable_id', 
            'entity'    => 'introable',
            'model'     => "App\Models\Company",
            'attribute' => 'name', 
        ]);

What I expected to happen

I thought I could update to Laravel Backpack v5 and this would still work.

What happened

After updating, creating a new Intro or updating an existing one throws an error. On create, I get: Field 'introable_id' doesn't have a default value even though I’ve double-checked that the request does indeed have introable_id set properly.

On update, I get: Call to undefined method App\Models\Intro::introable_id() The relationship is called ‘introable’ but the db column is called introable_id. This is thrown because line 99 in the Create trait is: $relation = $item->{$relationMethod}();

What I’ve already tried to fix it

I tried to port over the v4 version of Select2 and that didn’t work. I verified that the request has the proper data and searched around a lotl

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 8.1.1 (cli) (built: Dec 17 2021 22:38:05) (NTS) Copyright © The PHP Group Zend Engine v4.1.1, Copyright © Zend Technologies with Zend OPcache v8.1.1, Copyright ©, by Zend Technologies

LARAVEL VERSION:

v8.83.8@cf430301ad17656b3d918995bcdd0454c3c119b9

BACKPACK VERSION:

5.0.14@1e355c4c046a34423a1a3e3150120245a4bfd8e9

[tabacitu]

@stevebeyatte , @adrienne I’ve just finished reviewing the new morphTo field inside repeatable. It is a BEAUTY: https://github.com/Laravel-Backpack/docs/pull/368

So simple, yet so powerful.

---

It’s going through one more round of testing, by @jorgetwgroup . We expect to have it merged in 1-2 weeks, max.

Thank you for your patience 🙏

[pxpm]

Hello @stevebeyatte

I am working on a core solution for the morph fields, I should have an mvp PR ready by tomorrow. In the meanwhile use entity => false on your introable_id field.

Let me know if that solves it for you.

Cheers