OphCoTherapyapplication_DecisionTreeNode::requiredIfNotOutcomeValidation PHP Method

    public function requiredIfNotOutcomeValidation($attribute)
    {
        if (!$this->outcome_id && !$this->{$attribute}) {
            $this->addError($attribute, $this->getAttributeLabel($attribute) . ' required if not an outcome node.');
        }
    }