public function validateAttribute($model, $attribute)
    {
        if ($this->isEmpty($model->$attribute)) {
            if ($this->value instanceof \Closure) {
                $model->$attribute = call_user_func($this->value, $model, $attribute);
            } else {
                $model->$attribute = $this->value;
            }
        }
    }
public function validateAttribute($model, $attribute)
    {
        if ($this->isEmpty($model->$attribute)) {
            if ($this->value instanceof \Closure) {
                $model->$attribute = call_user_func($this->value, $model, $attribute);
            } else {
                $model->$attribute = $this->value;
            }
        }
    }
public function validateAttribute ( $ model , $ attribute ) { if ( $ this -> isEmpty ( $ model -> $ attribute ) ) { if ( $ this -> value instanceof \ Closure ) { $ model -> $ attribute = call_user_func ( $ this -> value , $ model , $ attribute ) ; } else { $ model -> $ attribute = $ this -> value ; } } }
{@inheritdoc}
{