Categories/Tags links are broken in WP 3.3.1, with multisite/subfolder install

[tszming]

All the default categories/tags links are not working, showing error..

"This is somewhat embarrassing, isn’t it?"

Steps to reproduce:

---

1. Install WP 3.3.1 on domain, e.g. ​http://blog.example.com
2. Enable multi-site features, using subfolder instead of subdomain
3. Create a site, e.g. ​http://blog.example.com/test1
4. Create a post, e.g. ​http://blog.example.com/test1/2012/03/04/test1/
5. Enter the default category link, e.g. ​http://blog.example.com/test1/category/uncategorized/

Now you will see the message: "This is somewhat embarrassing, isn’t it?"

Fix:

---

1. Enter this link: ​http://blog.example.com/test1/wp-admin/options-permalink.php
2. Change nothing, press "Save Changes"
3. Now you can view the link correctly: ​http://blog.example.com/test1/category/uncategorized/

The above issue also apply to tags

[scribu]

Seems like the permalinks are not flushed when creating a site.

[duck_]

Rewrite rules are flushed during site creation, see ​wp_install_defaults().

The problem is that categories, tags and formats have already been registered with the "/blog/" prefix because they were registered during the init of the main site. So, when the rewrite rules are generated they have a different structure to the rest of the rules. I suspect that you encounter the same problem for any custom taxonomies/post types which register with_front as true.

In 3.1 it was only formats that had the problem. with_front => true was introduced for categories and tags in 3.1.1.

[duck_]

I thought of maybe adding a "rewrite_init" action to WP_Rewrite::init() and hooking taxonomy registration onto that. So taxonomies are re-registered whenever the permalink structure is changed.

[scribu]

'rewrite_init' seems like a good idea. Any drawbacks to using it for general CPT and taxonomy registration?

[duck_]

Replying to scribu:

'rewrite_init' seems like a good idea. Any drawbacks to using it for general CPT and taxonomy registration?

None that I have found so far.

Related #20174.

[duck_]

#24585 was marked as a duplicate.

[duck_]

Moving to 3.7 for review per #24585.

[jeremyfelt]

Related #16201

[DrewAPicture]

rewrite_init.diff​ still applies to current trunk. This new action will need docs if we decide to move on it for 3.7.

[jeremyfelt]

Tested 20171.diff​ against current trunk and all works as expected.

[nacin]

I like this but there are going to be some side effects. For one, WP_Rewrite is init'd well before the init hook, including before the locale is loaded. We could do it on both 'rewrite_init' and 'init', but at that point, we're firing create_initial_taxonomies() *three* times on bootstrap. Maybe we attach it to rewrite_init only after init() runs once.

This needs more testing and careful consideration.

[rosyteddy]

Its really a long time that this has not been corrected.
New installations can benefit if a small notice is added at the time of Multisite installation:
"If its a subfolder installation "Categories" and "Post Format" links will not work or will be problematic. Do you still want to continue with 'subfolder'?"

Is there any plugin / can any one kindly contribute a plugin for those of us who have already done subfolder installation and later discovered that there site members are unable to use categories out of the box? Thanks.

[boonebgorges]

#31567 was marked as a duplicate.

[jeremyfelt]

#35297 was marked as a duplicate.