function copyto_flat($key) {
		/** @var \Base $f3 */
		$f3 = \Base::instance();
		$this->copyto($key);
		foreach ($this->fields() as $field) {
			if (isset($this->fieldConf[$field]) && isset($this->fieldConf[$field]['relType'])
				&& $this->fieldConf[$field]['relType']=='has-many'
				&& $f3->devoid($key.'.'.$field)) {
				$val = $this->get($field);
				if ($val instanceof CortexCollection)
					$f3->set($key.'.'.$field,$val->getAll('_id'));
				elseif (is_array($val))
					$f3->set($key.'.'.$field,$val);
				else
					$f3->clear($key.'.'.$field);
			}
		}
	}