On my site, I have permalinks for different categories. If I have a forum with the same name as one of the categories, then the permalink for that forum will have a “-2” added at the end. For example, if I have a travel category and a travel forum, then my travel category will have permalink:

http://www.example.com/travel

While my travel forum will have permalink:

http://www.example.com/forum/cat/travel-2

Here, I changed the Forum slug in the backend to “cat” instead of “forum”.

Why would the forum permalink add a “-2” at the end? Every time I try to update the slug to the forum from the backend, just adding “travel”, when I save it, it comes back to me as “travel-2”. This one has me stumped.

[@johnjamesjacoby Keymaster 12 years ago]

WordPress does not have hierarchical collision detection for full paths. This means no two posts can have the same slug.

[@rsanchez1 Participant 12 years ago]

There’s no workaround to make it do hierarchical collision detection?

[@jaredatch Member 12 years ago]

Unfortunately, not currently. That would be something that would need to done on a WordPress core level. I’m not aware of that being an issue they are going to address soon, but maybe I just haven’t seen it in WP trac.

[@rsanchez1 Participant 12 years ago]

I see. Thanks for clearing that up.

[@cwdnow Participant 10 years, 10 months ago]

Fix slated for 3.9: https://core.trac.wordpress.org/ticket/18962