How do I query a custom post type with a custom taxonomy?

5 comments

1. Firs of all don’t use query_posts() ever, read more about it here: When should you use WP_Query vs query_posts() vs get_posts()?.

   You have to use WP_Query to fetch posts what you need. Read documentation for it. In your case the query could be like this:

   $the_query = new WP_Query( array(
       'post_type' => 'Adverts',
       'tax_query' => array(
           array (
               'taxonomy' => 'advert_tag',
               'field' => 'slug',
               'terms' => 'politics',
           )
       ),
   ) );
   
   while ( $the_query->have_posts() ) :
       $the_query->the_post();
       // Show Posts ...
   endwhile;
   
   /* Restore original Post Data 
    * NB: Because we are using new WP_Query we aren't stomping on the 
    * original $wp_query and it does not need to be reset.
   */
   wp_reset_postdata();
   

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2. i am using this query to fetch custom posts (FAQs Posts) with its custom taxonomy (faq_category). since {taxonomy} parameter in WP_Query args was deprecated since v.3.1 and introduced {tax_query}. below is the code that works perfectly.

   $query = new WP_Query( array(
       'post_type' => 'faqs',          // name of post type.
       'tax_query' => array(
           array(
               'taxonomy' => 'faq_category',   // taxonomy name
               'field' => 'term_id',           // term_id, slug or name
               'terms' => 48,                  // term id, term slug or term name
           )
       )
   ) );
   
   while ( $query->have_posts() ) : $query->the_post();
       // do stuff here....
   endwhile;
   
   /**
    * reset the orignal query
    * we should use this to reset wp_query
    */
   wp_reset_query();
   

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3. Here the code that works like magic. I am fetching all posts for the custom post_type “university_unit” with custom taxonomy “unit_type” and multiple taxonomy terms as “directorate” and “office”.
   I hope it helps out.

   <?php
   $args = array(
       'post_type' => 'university_unit',
       'posts_per_page' => -1,
       'orderby' => 'title',
       'order' => 'ASC',
       'tax_query' => array(
   
           array(
               'taxonomy' => 'unit_type',
               'field' => 'slug',
               'terms' => array('directorate', 'office')
           )
   
       )
   );
   
   $Query = new WP_Query($args);
   if($Query -> have_posts()):
   
       while($Query -> have_posts()):
           $Query -> the_post();
           ?>
           <div class="cm-post-list-item">
               <article>
                   <div class="cm-post-head">
                       <h3 class="cm-text-blue">
                           <a href="<?php the_permalink(); ?>"><?php the_title();?></a>
                       </h3>
                   </div>
                   <div class="cm-post-body"><?php the_excerpt();?></div>
               </article>
           </div>
           <?php
       endwhile;
   
   else:
       "No Administrative Offices Found. Try again later";
   endif;
   wp_reset_postdata();
   ?>
   

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4. This helped me to get all posts listed under each term for custom taxanomy for CPT

       <?php
       // Get list of all taxonomy terms  -- In simple categories title
       $args = array(
                   'taxonomy' => 'project_category',
                   'orderby' => 'name',
                   'order'   => 'ASC'
               );
       $cats = get_categories($args);
   
       // For every Terms of custom taxonomy get their posts by term_id
       foreach($cats as $cat) {
           ?>
           <a href="<?php echo get_category_link( $cat->term_id ) ?>">
               <?php echo $cat->name; ?> <br>
               <?php // echo $cat->term_id; ?> <br>
           </a>
   
   
               <?php
                   // Query Arguments
                   $args = array(
                       'post_type' => 'portfolio', // the post type
                       'tax_query' => array(
                           array(
                               'taxonomy' => 'project_category', // the custom vocabulary
                               'field'    => 'term_id',          // term_id, slug or name  (Define by what you want to search the below term)    
                               'terms'    => $cat->term_id,      // provide the term slugs
                           ),
                       ),
                   );
   
                   // The query
                   $the_query = new WP_Query( $args );
   
                   // The Loop
                   if ( $the_query->have_posts() ) {
                       echo '<h2> List of posts tagged with this tag </h2>';
   
                       echo '<ul>';
                       $html_list_items = '';
                       while ( $the_query->have_posts() ) {
                           $the_query->the_post();
                           $html_list_items .= '<li>';
                           $html_list_items .= '<a href="' . get_permalink() . '">';
                           $html_list_items .= get_the_title();
                           $html_list_items .= '</a>';
                           $html_list_items .= '</li>';
                       }
                       echo $html_list_items;
                       echo '</ul>';
   
                   } else {
                       // no posts found
                   }
   
                   wp_reset_postdata(); // reset global $post;
   
                   ?>
   
       <?php } ?>
   

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5. This answer now is not valid anymore since wordpress changes their taxonomy parameter information. please use this way. It will work. It works for me. “tax_query” replaces with “tax”. hope it will work.

   $the_query = new WP_Query( array(
       'post_type' => 'Adverts',
       'tax' => array(
           array (
               'taxonomy' => 'advert_tag',
               'field' => 'slug',
               'terms' => 'politics',
           )
       ),
   ) );
   
   while ( $the_query->have_posts() ) :
       $the_query->the_post();
       // Show Posts ...
   endwhile;
   
   /* Restore original Post Data 
    * NB: Because we are using new WP_Query we aren't stomping on the 
    * original $wp_query and it does not need to be reset.
   */
   wp_reset_postdata();
   

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