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I’m doing a blog in CakePHP, so I have two tables in my database that are HABTM related: posts and tags. Because they are HABTM related I also have a poststags table keeping track of relations.
I’d like to have a method in my tags_controller that will delete all unused tags.
How do I find all tags that are NOT associated with any posts?
You could use the following statement to delete all unused tags:
$this->query('delete from tags where not exists (select * from posts_tags where posts_tags.tag_id = tags.id)');(And to find all tags not associated with any posts simply replace the “delete” with “select *”)