public function initDealerContactVersions($overrideExisting = true)
    {
        if (null !== $this->collDealerContactVersions && !$overrideExisting) {
            return;
        }
        $this->collDealerContactVersions = new ObjectCollection();
        $this->collDealerContactVersions->setModel('\Dealer\Model\DealerContactVersion');
    }