InputGroupTrait : Error with InputGroupTrait when a field (with complex addons options) have a validation error

[MaximeOh]

I have an error with a Formless Model when my field have a validation error.

Important thing, this issue is present only when my field have addon and addons options with class property filled.

I used CakePhp 5.1.6 and Bootstrap-ui 5.1.1 (the last version)

// no bug here
$this->Form->control('paperWidth', ['class' => 'form-control', 'append' => ['mm']]);

// no bug here too
$this->Form->control('paperWidth', ['class' => 'form-control', 'append' => ['mm', ['size' => 'lg']]]);

// bug here
$this->Form->control('paperWidth', ['class' => 'form-control', 'append' => ['mm', ['size' => 'lg', 'class' => 'input-group-with-unit']]]);

[dereuromark]

Would it make sense to have

$attrs['class'] = (array)$attrs['class'];

beforehand, to make sure it works to merge?

[MaximeOh]

Oh, if I understand you correctly, your suggestion is an elegant way to 'convert' attrs['class'] to an array containing the string if attrs['class'] is not an array.

I tried your suggestion just before line 76, like this:

.

It seems to work well; I have no issues with my field, the error messages are displayed, and the input group container has its classes (no rendering issues detected).

.

Nice!

[dereuromark]

You want to make A PR?

[MaximeOh]

Yes, I'll try.