public function currentBuilds() {
		if(!isset(self::$relation_cache['currentBuilds.'.$this->ID])) {
			$currentBuilds = array();
			foreach($this->Environments() as $env) {
				$currentBuilds[$env->Name] = $env->CurrentBuild();
			}
			self::$relation_cache['currentBuilds.'.$this->ID] = $currentBuilds;
		}
		return self::$relation_cache['currentBuilds.'.$this->ID];
	}