Doesn't work with versioned data objects?

[MattyBalaam]

I noticed that this didn't appear to work with versioning.

I hacked something together, but this shares some parts with the onBeforeWrite code and could do with a nice refactor, but should be a start, or a help to someone else coming across the same issue.

	public function onBeforePublish($original) {
			$toPublish = array();
	
    		if ($this->owner->toMap()) foreach($this->owner->toMap() as $name => $value) {
	
    			if(!strpos($name, self::separator)) {
	    			// Also skip $name that starts with a separator
		    		continue;
				}
	
    			list($hasone, $key) = explode(self::separator, $name, 2);
	    		if($this->owner->has_one($hasone) || $this->owner->belongs_to($hasone)) {
		    		$rel = $this->owner->getComponent($hasone);
					$rel->setCastedField($key, $value);
    				$toPublish[$hasone] = $rel;
	    		}
			}
	
    		foreach($toPublish as $rel => $obj) {
	    		if ($obj->hasMethod('publish') ) {
		    		$obj->write($this->owner);
			    	$obj->publish('Stage', 'Live');
				}
	
    			$key = $rel . 'ID';
	    		if(!$this->owner->$key) {
		    		$this->owner->$key = $obj->ID;
    			}
			}
    }

[hchokshi]

@MattyBalaam might be an unnecessary necro, but this should be accomplished by setting private static $owns = [] on the parent object, which will publish relations on publish.