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I have been struggling with Taxonomies and Post Types for a while and could really use help understanding what would be the best implementation for my situation.

Have a look here: http://shaulzofef.com/netivyah/resources/audio-lessons/

I setup a few post types; Books, Magazines, Articles and Audiolessons. I setup a few Taxonomies: Language, Author, Teacher. Teacher is associated to one post type only, Audiolessons, but Language is associated to all post types. I made a submenu on the audio page that has English, Hebrew and Russian at parent level and underneath a list of teachers in each language.

I have a few problems: 1 - Some teachers teach in more than one language, so if I click on Joseph under English how will I make it list only the posts with taxonomy term Joseph AND taxonomy term English? 2 - When I click on English it lists the English Audiolessons AND other posts associated with taxonomy term English (articles, books and so on). How would I list only the Audiolessons?

I realize I can code a Wordpress query for posts related to post type and taxonomy, however that will require a file for each combination..

I could create separate taxonomies for each post type, 'Audio-Language' for instance, then I could easily list them, but that doesn't seem right.. then what if I do want an option to list all English resources together. Should I create hierarchical taxonomies instead?.. I'm getting confused. Any help much appreciated.

  • Your page isn't loading. I don't know if this will help you, but I found it helpful when I had multiple taxonomies: thereforei.am/2011/10/28/… – helgatheviking May 18 '14 at 17:07
  • Thank you @helgatheviking. That indeed helped. Now audiolesson/language/english/teacher/josephshulam/ gives me what I want. but audiolesson/language/english still lists all english posts, including not audio lessons. It is not filtering by post type. What am I doing wrong? I would appreciate if you have a look at my plugin file here – Shaul May 19 '14 at 9:30
  • You can add code to your answer instead of linking off-site. – helgatheviking May 19 '14 at 12:26
  • It's just a long piece of code, I didn't want to mess the page... – Shaul May 19 '14 at 12:30
  • Sorry, I'm not going to look over your entire plugin. If you are posting your entire plugin the odds are that you aren't asking a specific enough question and that you aren't posting just the relevant code. I would try rephrasing your question. – helgatheviking May 19 '14 at 12:35
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If you want to filter your audio lessons post archive you could borrow from the article I linked you to and add a custom rewrite rule:

function wpa_add_rewrite_rules() {
    global $wp_rewrite;

    $new_rules = array(
        'audio-lessons/language/(.+)/?$' => 'index.php?post_type=audio-lesson&language=' . $wp_rewrite->preg_index(1)
    );
    $wp_rewrite->rules = $new_rules + $wp_rewrite->rules;
}
add_action( 'generate_rewrite_rules', 'wpa_add_rewrite_rules' );

After re-saving your permalinks, something like http://example.com/audio-lessons/language/english would show all the English audio lessons.

However, I am not sure the URL you provided is a post type archive and not a custom page template.

If it is a page template and you are running multiple Wp_Query() calls you could register a new query variable and build your tax_query up from that.

function wpa_add_new_query_vars($vars) {   
    $vars[] = 'language'; // name of variable you want to add       
    return $vars;
}
add_filter( 'query_vars', 'wpa_add_new_query_vars', 10, 1 );

You may not even need this part as I think the query var is registered when you register the taxonomy.

Then you could query posts like so:

$args = array(
    'post_type' => 'audio-lesson'
);

if( $lang = get_query_var( 'language' ) ){
    $args['tax_query'] = array( array( 
            'taxonomy' => 'language',
            'field' => 'slug',
            'terms' => '$lang'
        ));
}

$my_posts = new WP_Query( $args );

I can't really test this and the tax_query can sometimes trip me up with its array of arrays so I'm not 100% sure it will work.

Then anywhere you wanted to make a link to a specific language section you could use add_query_arg()

  • Thank you so much! Your custom rewrite rule worked! And the reason I was getting audio lessons of all languages before was because I had a query_posts in my archive-audiolesson.php page that overwrote the query. My bad. Thanks again :) – Shaul May 19 '14 at 15:25
  • And to build the menu by URL's I used the Relative Menu Item Plugin – Shaul May 19 '14 at 15:31

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