public function getRelation() {
        if (is_null($this->_relation) || $this->_relation->getRelationId() !== $this->getRelationId()) {
            $model = $this->loader->getModels()->getRespondentRelationModel();
            $relationObject = $model->getRelation($this->getRespondentId(), $this->getRelationId());
            $this->_relation = $relationObject;
        }

        return $this->_relation;
    }