Yii Conditional Validation

I have a question about Yii validation. I have a dropdown whose options are Y and N. If the user select Y the user must explain why he chose Y hence a textArea box will become required.

My code for the rule looks at follows.

array('explain', 'check', 'trigger'=>'med_effects'),

Check is my function used for validation

public function check($attribute, $params)
    {
        if($this->$params['trigger'] == 0 && $this->$attribute == '') {
            $this->addError($attribute, 'Explain the effects of the medicine');
        }
    }
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The value for $this->$params['trigger'] does not change. I'm assuming because the saved value was 0(Y) and does not change even if the user choose N. How am I supposed to determine which option the user chose when he sumbits the form?

Thanks.

Create a property inside your model:

public $isDropDownChecked;

In your view, create a dropdown wired to new property created.

And return a array of rules inside the method rules() like this:

public function rules()
{
   $rules[] = array(); 

   if ($this->isDropDownChecked == 'Y')
        $rules[] = array('explain', 'check', 'trigger'=>'med_effects');    


   return $rules;
}

This may also help someone on Yii1, say you have three fields with a lookup of [Yes|NO], and you want atleast one field to be selected as Yes

Here is the solution on your model add

public $arv_refill;
public $prep_refilled;
public $prep_initiate;

on your rules add

public function rules()
{
    return array(
   array('arv_refill,prep_refilled,prep_initiate','arvPrepInitiateValidation'),
    );
 }

arvPrepInitiateValidation being a function

public function arvPrepInitiateValidation($attribute_name,$params)
    {
        
        if($this->arv_refill != 1 && $this->prep_refilled != 1 && $this->prep_initiate != 1){
            $msg = "arv_refill, prep_refilled or prep_initiate field must have one field as Yes";
            $this->addError('arv_refill',$msg);
            $this->addError('prep_refilled',$msg);
            $this->addError('prep_initiate',$msg);
        }
    }