Switch news detail view template based on parent category

Detail.html

<f:section name="Main">
	<f:if condition="{newsItem}">
		<v:switch value="{newsItem.categories -> v:iterator.extract(key: 'parentcategory') -> v:iterator.extract(key: 'uid') -> v:iterator.first() -> v:or(alternative: 0)}">
			<v:case case="{v:variable.typoscript(path: 'plugin.tx_mmstemplates.settings.campaignsRootCategoryUid')}" break="TRUE">
				<f:render partial="News/Detail/Campaign" section="Main" arguments="{_all}" />
			</v:case>
			<v:case case="default">
				<f:render partial="News/Detail/Default" section="Main" arguments="{_all}" />
			</v:case>
		</v:switch>
	</f:if>
</f:section>