Add Exclude by Tag to Queries

[iridox]

Per scribu's instruction:

Category exclusion is already possible for feeds using a query string, tags should be the same.

Example:

​http://domain.com?cat=news&tag=-featured&feed=rss2

Would equate to a feed of posts in the "news" category, not tagged "featured" and outputted via the RSS2 template.

​http://domain.com?category_name=news&tag=-featured&feed=rss2

Fixed the example URL, woops.

I think this would require introducing a new query var that accepts tags by ID (in the same way that cat accepts category IDs). If that is going to happen, then it seems to me that if possible it should be done to work with any taxonomy and not just tags.

That would make sense. The way I've been achieving this filter so far is hooking into the pre_get_posts filter like so:

function exclude_tags_rss($query) {
	if ( $query->is_feed) {
		if( isset($_GET['tag__not_in']) ) {
			$qv = $_GET['tag__not_in'];
			if( strpos($qv, ',') !== false) $tag = explode(',', $qv);
			else $tag[] = $qv;
		}
		$query-> set('tag__not_in', $tag);
	}
return $query;
}
add_filter('pre_get_posts','exclude_tags_rss');

There must be a better way to do this...

Not sure what is requested here... tag__not_in seems like the way to go... maybe close this?

Use tag__not_in