GraphAware\Neo4j\OGM\Metadata\RelationshipMetadata::initializeCollection PHP Method

    public function initializeCollection($object)
    {
        if (!$this->isCollection()) {
            throw new \LogicException(sprintf('The property mapping this relationship is not of collection type in "%s"', $this->className));
        }
        if ($this->getValue($object) instanceof ArrayCollection || is_array($this->getValue($object)) || $this->getValue($object) instanceof LazyRelationshipCollection) {
            return;
        }
        if (null === $this->getValue($object)) {
            $this->setValue($object, new Collection());
            return;
        }
        //throw new \RuntimeException(sprintf('Unexpected initial value in %s', $this->className));
    }