Yii dropDownList default value

Question

I have this code:

echo $form->dropDownList($model, 
                 'defaultPrinterId', 
                  CHtml::listData(Printer::model()->findAll(), 'id', 'name'), 
                  array('prompt' => '-- None--')); 

Which gives me a dropdown list like this:

<select id="LabelType_defaultPrinterId" name="LabelType[defaultPrinterId]">
    <option value="">-- None --</option>
</select>

However, when the form posts, it adds a value to my table where the defaultPrinterId is 0. Instead of that, how would I make it null, since it's a nullable field?

Answer 1

If you want to follow strictly the MVC, validation of values related to the model should be done in, well, the model.

It can be done with something like this:

/**
 * @return array validation rules for model attributes.
 */
public function rules() {
    // NOTE: you should only define rules for those attributes that
    // will receive user inputs.
    return array(
        //rules rules rules...
        array('defaultPrinterId', 'default', 'setOnEmpty' => true, 'value' => NULL),
        //rest of the rules
    );
}