Can I pass a query to a custom post type using a custom taxonomy?

One day wasted on this and I still haven’t managed to fix this 🙁

I am sure there must be a way!?

I even tried to hardcode the URL like: /index.php?pagename=partners&cidade=rome
Or /partners/?city=rome or /partners/&city=rome … doesn’t matter… nothing works! 🙁

However if I do this in any other page for my default post type, it works! There must be something that I am doing wrong…

I found an article here which I think is about what I am trying to do, so based on their tutorial’s code, I came out with the code below.

The idea is that the page called partners (which shows posts of the type partner) can accept the URL query for the custom taxonomy called city.

NOTE: partners (in plural) is a page name. The custom taxonomy is partner (in singular form). With the exception of not being able to query posts of the type partner based on the taxonomy city, everything else is working like it should.

Here is the code I came up with:

<?php
// my desperate attempt of passing URL queries to post type PARTNER
function add_query_vars($aVars) {
    $aVars[] = "city";    // represents the name of the product category as shown in the URL
    return $aVars;
}
add_filter('query_vars', 'add_query_vars'); // hook add_query_vars function into query_vars
?>
<?php
function add_rewrite_rules($aRules) {
    $aNewRules = array('partners/([^/]+)/?$' => 'index.php?pagename=partners&city=$matches[1]');
    $aRules = $aNewRules + $aRules;
    return $aRules;
}

// hook add_rewrite_rules function into rewrite_rules_array
add_filter('rewrite_rules_array', 'add_rewrite_rules');
?>

But so far I have no luck… Am I on a lost cause? I would appreciate any input from you guys.

Thanks in advance,
P.

For those of you coming to this post on RLM’s SEO blog:
rlmseo.com/blog/passing-get-query-string-parameters-in-wordpress-url

The way the solution I found works with “ugly” links only so far. For example:

/index.php?pagename=partner&city=rome

As for how I achieved this, in my page-partners.php I added the following code before my loop:

<?php
$paged = get_query_var("paged");
$url = $_SERVER['REQUEST_URI'];
parse_str($url, $query);
query_posts("&post_type=partner&orderby=title&order=asc&city=" . $query['city'] . "&paged=" . $paged);
global $more;
$more = 0;
?>

In the above code, replace:
* partner: for the post-type you want to query. In my case partner is a custom post type.
* city: this is your custom taxonomy. Replace city with the taxonomy you want to use. Note that the custom taxonomy (city) is mentioned two times in the code. The first time (&city=) is to add the ability to query the post type with the city taxonomy. The second time (". $query['city'] . ") is to append to &city= the value from the query city returned by the URL.

$query is an array holding all the queries from the URL, so what we doing is catching the value for city, which is the taxonomy term.

HERE IS THE CATCH
For pretty links (that is, using permalinks), so far I haven’t been successful in doing something such as /partners/city/rome (this would be amazing) or /partners?city=rome (I can live with this!)

In my search to perfect my solution, I came across a plug-in called Query Multiple Taxonomies that might be of help (well so it seems by the description of it). But I got no luck with it either (so far).

Anyway I asked on the plug-in’s forum if it is possible to use that plug-in to do something such as /custompage/taxonomy/term.

I hope people will participate in the discussion.

Regards,
P.