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Opened 12 years ago

Closed 12 years ago

#21209 closed defect (bug) (fixed)

Pagination on bare category slugs returns 404 errors

Reported by: nkinkade's profile nkinkade Owned by: nacin's profile nacin
Milestone: 3.4.2 Priority: normal
Severity: normal Version: 3.4.1
Component: Permalinks Keywords: has-patch
Focuses: Cc:


Since upgrading to 3.4 or 3.4.1 (not sure which), I discovered that pagination is broken, returning 404 errors, on URLs which utilize bare category slugs.

Steps to reproduce:

  • Install a fresh copy of 3.4.1
  • Set a custom permalink structure to anything that begins with /%category%/, for the sake of example: /%category%/%postname%/
  • Create a regular category with any name/slug you like. For the purposes of this sample, the slug will be mycat
  • Create a number of sample posts which exceeds the value of Settings->Reading->Blog pages show at most # posts, adding each of them to the category created in the step above, thereby creating a paging situation.
  • Access the URL: http://mysite/mycat, which should render the most recent posts, with a link to "Older posts" at the bottom.
  • Click on "Older posts", and the resulting page should yield a 404 error, the page address being http://mysite/mycat/page/2.

This issue is very similar to the very old ticket #5331.

Ostensibly, the reason why a 404 is returned is because no rewrite rules are generated to catch such permalinks, and a review of the rewrite rules, via some plugin or simply printing $wp_rewrite->rules(), reveals this to be true.

Whether bare category slugs without a category base are even technically allowed is another issue. But even so, because this undocumented/illegal "functionality" has been around for years and years, this feels like a regression to anyone who may have inadvertently come to rely on it.

At a bare minimum WP should not be generating links which produce 404s, and it would be very nice, and consistent with past behavior of the code, if URLs of the form http://mysite/mycat/page/2 were supported.

Attachments (1)

21209.patch (600 bytes) - added by SergeyBiryukov 12 years ago.

Download all attachments as: .zip

Change History (12)

#1 @nkinkade
12 years ago

  • Cc nkinkade added

#2 @dd32
12 years ago

  • Keywords reporter-feedback added

This appears to be a duplcate of #21020 - which is fixed in 3.4.1. Can you flush your permalinks by visiting/saving the Rewrite rules permalinks page? and see if that fixes it?

#3 @nkinkade
12 years ago

The problem is present in 3.4.1. Run through the steps to reproduce the error, which I included in the original report. Neither is it an issue with flushing rewrite rules, because this happens on a completely blank/fresh install of 3.4.1. I tested it in on a completely new/clean install of 3.4.1 just yesterday.

#4 @SergeyBiryukov
12 years ago

  • Keywords reporter-feedback removed
  • Milestone Awaiting Review deleted
  • Resolution set to duplicate
  • Status changed from new to closed

This is actually a duplicate of #8905.

I can reproduce in current trunk, but also in 3.2 and 3.3, so it's not a regression. Bare category URLs were never fully supported out of the box after all.

In 3.0, there was a canonical redirect from /mycat to /category/mycat (#18734 has an overview of related changesets).

As a workaround, WP No Category Base plugin can be installed to create the missing rewrite rules.

#5 @SergeyBiryukov
12 years ago

Access the URL: http://mysite/mycat

Note: I had to type that link manually. By default, it was http://mysite/category/mycat, even with /%category%/%postname%/ structure.

#6 @georgestephanis
12 years ago

Yeah, by default


would evaluate with the /%category%/%postname%/ structure to look for a post with a slug of page in a category of mycat -- I think ideal on this would be to hardcode an exception for postname=page so that it can never be a slug, and will always skip that rule and evaluate down to the second rule.

Just to confirm this -- try changing your permalink structure to /%category%/%post_id%-%postname%/ and see if it still catches page as a 404

#7 @SergeyBiryukov
12 years ago

  • Keywords has-patch added
  • Milestone set to 3.4.2
  • Resolution duplicate deleted
  • Status changed from closed to reopened

Reopening after more investigation (IRC logs).

Like I said, with /%category%/%postname%/ structure the issue can be reproduced in 3.3 as well (and is a duplicate of #8905).

However, with these structures bare category URLs pagination used to work in 3.3 and no longer works in 3.4.1:


As mentioned in this thread, there were two rewrite rules in 3.3 which are missing in 3.4.1:

[(.+?)/([^/]+)/page/?([0-9]{1,})/?$] => index.php?category_name=$matches[1]&name=$matches[2]&paged=$matches[3]
[(.+?)/page/?([0-9]{1,})/?$] => index.php?category_name=$matches[1]&paged=$matches[2]

21209.patch fixes the issue by reverting one more piece of [19737].

Related: #19876, #21020

#8 @nkinkade
12 years ago

Thanks for checking into this a bit more. I was writing a reply on the closed ticket when I noticed you had updated the ticket, so I trashed the reply. I was going to mention that our permalink structure is not actually /%category%/%pagename%/, but instead:


... and it is with that permalink structure that we're seeing the issue. Just after opening this ticket I committed a small fix to a custom plugin we have. It is partly what you've got above, but adding a couple more to account for each part of the path of our permalink structure.

As far as the WP No Category Base plugin, I tried that with 3.4, before 3.4.1 was released, and it gave us some unexpected results, like showing a category archive on pages which should have been showing a page (via page slug), and some other weirdness, so I bailed on it, not trusting that the dozens and dozens of rewrites rules it was creating were going to behave in predictable ways.

#9 @duck_
12 years ago

Patch works as intended.

#10 @duck_
12 years ago

In [21705]:

Reinstate paged rewrite rules for the post permalink structure.

Removal of this stopped pagination working for bare category URLs when
certain %category% based permalink structures were in used.

Reverts one more piece of [19737]. Props SergeyBiryukov. See #21209.

#11 @nacin
12 years ago

  • Owner set to nacin
  • Resolution set to fixed
  • Status changed from reopened to closed

In [21709]:

Reinstate paged rewrite rules for the post permalink structure.

Removal of this stopped pagination working for bare category URLs when
certain %category% based permalink structures were in used.

Reverts one more piece of [19737].
Props SergeyBiryukov.
fixes #21209 for 3.4.

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