WordPress URL rewrite custom taxonomy using add_rewrite_rule() or generate_rewrite_rules()

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I’m trying to get my head around amending some URL’s for a website I have created. After reading two (very informative) answers (1, 2) but I’m still a little unsure how to approach creating a URL that shows a custom post type in the hierachy of it’s categories (created by custom taxonomies).

From my reading, I gather that add_rewrite_rule or generate_rewrite_rules seem to be the best options to use, but I cannot seem to get it functional… like… at all! Here is the URL structure I have currently:

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Base        = http://domain.com/bands
Category    = http://domain.com/band-type/acoustic-duos
Single Post = http://domain.com/bands/duo-1

And here is what I am looking to achieve: 

Base        = http://domain.com/bands
Category    = http://domain.com/bands/acoustic-duos
Single Post = http://domain.com/bands/acoustic-duos/duo-1

In the scenario above, bands is the custom-post-type, whilst band-type is the custom-taxonomy I have created for ‘bands’.

From using @jan-fabry Rewrite Analyzer plugin, I can see the custom taxonomy pattern is: band-type/([^/]+)/?$ for the first argument for add_rewrite_rule() but I don’t know how WordPress references custom taxonomies in the index.php URL variable, used for the $redirect argument (e.g. index.php?tax=bands)… so unsurprisingly the following code (placed within functions.php) did not work at all: 

wp_reset_query();
function sheixt_init()
{
add_rewrite_rule(
    'band-type/([^/]+)/?',
    'index.php?cat=&band-type=$matches[1]',
    'top' );
}
add_filter( 'query_vars', 'sheixt_query_vars' );
function sheixt_query_vars( $query_vars )
{
    $query_vars[] = 'band-type';
    return $query_vars;
}

I still feel I’m not grasping how this works (at all!) and reading the codex is confusing me further so I’m not sure how to approach using generate_rewrite_rules().

Lastly, I’m wondering if I’m fooling foul of a permalink conflict, as I want the custom-taxonomy (band-type) to use the custom-post-type’s slug (‘bands’) as the baseline for the URL.

Please can you point me in the right direction, I can provide more information if necessary. Thanks.

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  1. This can all be done with your .htaccess file. This assumes the .htacces file is in your root directory and that wordpress is installed in the root directory and not a subfolder. If you installed wordpress in a subfolder change the RewriteBase to:

    RewriteBase http://domain.com/subfolder/

    Where subfolder is the subdirectory where you installed wordpress. For all else use the code below where the wordpress install is in the root directory.

    # BEGIN WordPress

<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index.php$ - [L]

RewriteRule ^band-type/acoustic-duos/(.*)$ bands/acoustic-duos/$1 [QSA,L]
RewriteRule ^bands/(.*)$ bands/acoustic-duos/$1 [QSA,L]


RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

    Be careful when editing the .htaccess file. Make sure to save a backup of your current .htaccess before editing using the code above. I believe the first RewriteRule should work. the second RewriteRule may cause a redirect loop or your site to crash because we are redirecting two urls:

    /bands/duo-1 
/band-type/acoustic-duos

    to have a new base of:

    /bands/acoustic-duos