lib/db/cortex.php
public function getRelSet($key) {
		return (isset($this->relSets[$key])) ? $this->relSets[$key] : null;
	}
public function getRelSet($key) {
		return (isset($this->relSets[$key])) ? $this->relSets[$key] : null;
	}
public function getRelSet ( $ key ) { return ( isset ( $ this -> relSets [ $ key ] ) ) ? $ this -> relSets [ $ key ] : null ; }
get a related collection
@param $key
@return null
get a related collection