I’m trying to add a ‘sub post’ to each post on my site, eg
site.com/product-one/changelog
site.com/product-two/changelog
site.com/product-three/changelog
This is the code I’m using atm, which I found here somewhere:
global $wp,$wp_rewrite;
$wp->add_query_var('sub-page');
$wp_rewrite->add_rule('([^/]+)/(changelog)','index.php?pagename=$matches[1]&sub-page=$matches[2]', 'top');
$wp_rewrite->flush_rules(false); // This should really be done in a plugin activation
This works fine if I browse to site.com/product-one?sub-page=changelog but if I goto site.com/product-one/changelog i just get redirected back to site.com/product-one
So I disabled the canonical redirect as a test using:
remove_filter('template_redirect', 'redirect_canonical');
site.com/product-one/changelog then doesn’t redirect but does return a 404 and site.com/product-one?sub-page=changelog still works.
Is there something I can change with my rewrite to make this work?
Note: I know I could do this easy with custom post types and I started to go down that route, but because the site is already using the %postname% permalink structure, I then wouldn’t be able to have the custom post type have that structure as well as the sites pages.
Answers:
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Method 1
add_rewrite_endpoint( 'changelog', EP_ROOT );
Will add the endpoint, changelog, which you can then check on template_redirect hook.
On match the query variables ( $wp_query->query ) array should contain key changelog containing whatever comes after the / in value. So for URL example.com/product1/changelog/5 you would have a query variable named changelog with the value 5.
If there is nothing after endpoint then variable will be present, but contain empty string. Note that get_query_var() won’t work for such use since it is hardcoded to return empty string if query var is not set at all.
It may be enough to simply check if a variable is present and if so, modify the query variables in the query hooks (such as pre_get_posts) and load your own sub-post with the changelog template.
You may also want to experiment with different permalink endpoint masks, e.g. EP_PAGES
References:
- Codex > Rewrite API and Codex > Rewrite API > add_rewrite_endpoint()
- Rewrite enpoints API post by Jon cave
- Monkeyman Rewrite Analyzer plugin for rewrite debug
- Custom Post Type Permalinks post by ShibaShake (scroll down)
All methods was sourced from stackoverflow.com or stackexchange.com, is licensed under cc by-sa 2.5, cc by-sa 3.0 and cc by-sa 4.0