Entity/Contact/Country.php
public function addRegion(RegionInterface $region)
    {
        $region->setCountry($this);
        $this->regions->add($region);
    }
public function addRegion(RegionInterface $region)
    {
        $region->setCountry($this);
        $this->regions->add($region);
    }
Add a region to this country

@param \Orkestra\Bundle\ApplicationBundle\Model\Contact\RegionInterface $region