Unselect value in activeRadioList

[kmergen]

activeRadioList automatically create a unselect value "0" (hidden field) for a given model attribute.

I think that is not a good solution for a comman usage, because when this attribute is required than the required validator add no error because the value is "0".

in Model rules

 public function rules()
    {
        return [
            ['color', 'required', 'message' => 'Please select a color'],
        ];
    }

That means that I must set the unselect option to null that the required validator works.

<?= $form->field($model, 'color')->radioList($this->context->module->getColors(), ['unselect' => null]) ?>

[kmergen]

Thanks.
But what is the benefit to set the unselect value in a radioList.
If you don't set it the required validatator works fine because after a attribute assignment the attribute is null.
And when you want to check the attribute in a controller you can use the isset function.
Only when you need a special value for the unselect attribute, then you can set the unselect option.

[qiangxue]

The reason is that if you don't select anything, the corresponding form field will not be submitted (if there's no hidden field for the unselect value). As a result, if you are modifying a model, the corresponding field will not be cleared (because it doesn't receive any input for it).

[kmergen]

Ok.
I must try this, because normaly when I submit a form I do the following steps in the controller

1. $model = new Model; (model attributes are cleared, or what do you mean with cleared)
2. assign submitted attributes to the model $model->load($_POST);
3. validate the model

[qiangxue]

For model creation, there's no problem. The problem only happens for updating model.

[kmergen]

Ok. You are right.
I think for checkboxes you must have this unselect hidden field, but for a radioList you only need it when you can manipulate the radioList wiht js.
I think the changes from fix #1610 are for all purposes the best.
Thanks.