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I'm trying to convert a bunch of posts within a CPT to items within a Custom Taxonomy, where the post titles become the taxonomy names and the post content becomes the taxonomy descriptions. I have the below code (also here) in a plugin but am not sure where to add my CPT and Tax names. Or if the code will fire properly from within the plugin. Any ideas?

/**
 * Create slugs/terms in jjm_author_tax taxonomy for all jjm_authors posts
 *
 */
function make_taxonomy_from_posts($post_type, $taxonomy){
   // Get all posts
   $query_posts = query_posts(array(
                             // ... of the requested type
                             'post_type'=> $post_type,
                             // ... and it supports the taxonomy
                             'taxonomy' => $taxonomy,
                             // ... without limit
                             'nopaging' => true,
                  ));

  // Reset the main query
  wp_reset_query();

  foreach ($query_posts as $query_post) {
      $post_id = $query_post->ID;
      $raw_title = $query_post->post_title;
      // Generate a slug based on the title.
      // We want to check for auto-draft so we don't create a term for a post with no title
      $slug_title = sanitize_title($raw_title);

      // Do the checks for empty titles
      // If the title is blank, skip it
      if ($slug_title == 'auto-draft' || empty($raw_title)) continue;
      // Get all of the terms associated with the post
      $terms = get_the_terms($post_id, $taxonomy);
      $term_id = 0;

      if (!empty($terms)) {
           $term_id = $terms[0]->term_id;
      }

     if ($term_id > 0) {
          // If the post has a term, update the term
          wp_update_term($term_id, $taxonomy, array(
                                               'description' => $raw_title,
                                               'slug' => $raw_title,
                                               'name' => $raw_title,
                         ));
     } else {
         // Otherwise add a new term
         wp_set_object_terms($post_id, $raw_title, $taxonomy, false);
     }
  }
}

I'm trying to convert a bunch of posts within a CPT to items within a Custom Taxonomy, where the post titles become the taxonomy names and the post content becomes the taxonomy descriptions. I have the below code (also here) in a plugin but am not sure where to add my CPT and Tax names. Or if the code will fire properly from within the plugin. Any ideas?

/**
 * Create slugs/terms in jjm_author_tax taxonomy for all jjm_authors posts
 *
 */
function make_taxonomy_from_posts($post_type, $taxonomy){
   // Get all posts
   $query_posts = query_posts(array(
                             // ... of the requested type
                             'post_type'=> $post_type,
                             // ... and it supports the taxonomy
                             'taxonomy' => $taxonomy,
                             // ... without limit
                             'nopaging' => true,
                  ));

  // Reset the main query
  wp_reset_query();

  foreach ($query_posts as $query_post) {
      $post_id = $query_post->ID;
      $raw_title = $query_post->post_title;
      // Generate a slug based on the title.
      // We want to check for auto-draft so we don't create a term for a post with no title
      $slug_title = sanitize_title($raw_title);

      // Do the checks for empty titles
      // If the title is blank, skip it
      if ($slug_title == 'auto-draft' || empty($raw_title)) continue;
      // Get all of the terms associated with the post
      $terms = get_the_terms($post_id, $taxonomy);
      $term_id = 0;

      if (!empty($terms)) {
           $term_id = $terms[0]->term_id;
      }

     if ($term_id > 0) {
          // If the post has a term, update the term
          wp_update_term($term_id, $taxonomy, array(
                                               'description' => $raw_title,
                                               'slug' => $raw_title,
                                               'name' => $raw_title,
                         ));
     } else {
         // Otherwise add a new term
         wp_set_object_terms($post_id, $raw_title, $taxonomy, false);
     }
  }
}

• taxonomy

Share Improve this question edited Feb 18, 2015 at 17:01 fuxia♦ 107k3838 gold badges255255 silver badges459459 bronze badges asked Feb 18, 2015 at 15:16 Josh MJosh M 34211 gold badge55 silver badges2222 bronze badges 4

• 2 You shoule never user query_posts(). Instead use get_posts() or create a custom query using the WP_Query class. – David Gard Commented Feb 18, 2015 at 15:33
• Thanks David. This only runs once so maybe using query posts isn't the end of the world. But I'm still not sure where to plug in my CPT and custom tax names. – Josh M Commented Feb 18, 2015 at 15:58
• 1 This should work just fine. It converts all posts within a post type (without caring if one with the same name existed before). gist.github/4b163188440a3785d004 – circuuz Commented Feb 18, 2015 at 16:01
• 1 It's always the end of the world to use query_posts(). Maybe even the universe... But anyway, see my answer below and comment on it if you need further help. – David Gard Commented Feb 18, 2015 at 16:02

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2 Answers 2

Sorted by: Reset to default 2

Here's the solution that worked for me. I added the below code to a page template (page-test.php) and then created a page called "test," loaded the page, and all the CPTS were converted to taxonomies. Not sure if this happened when I created the page or when I loaded it... And then I quickly deleted the page template so I didn't end up with a bunch of duplicates.

<?php
    function cpt_to_tax($post_type, $taxonomy) {
    $posts = get_posts(array(
                 'post_type' => $post_type,
                 'posts_per_page' => -1,
            ));
    
    foreach($posts as $post) {
        wp_insert_term($post->post_title, $taxonomy, array(
                'description' => $post->post_content,
            ));
        }
    }

    cpt_to_tax('jjm_authors', 'jjm_author_tax');
?>

The solution itself was provide by https://wordpress.stackexchange/users/35470/circuuz, though his post seems to be deleted now. :(

First we create a new custom query containing all published posts of type $post_type, which you pass to the function. If you don't just want published posts you can pick and choose the status' that you require - see this part of the WP_Query Codex.

Next we use The Loop to loop through the resultant posts and for each check if the post name exists as a term within $taxonomy (which you also pass to the function) using term_exists(), and if not, we add it using wp_insert_term(). Using this means that we only have to pass the name and description, while the slug will be automatically created based on the name.

Finally, just before exiting The Loop we reset the global $post using wp_reset_postdata()

Place this entire code block into functions.php in the order that it is on here. While you can just leave this code to run on every page load (duplicate category names will not be created), it's recommended for permormance reasons and you should ensure that you comment the call to add_action() when you are done.

add_action('init', 'init_make_taxonomy_from_posts');
function init_make_taxonomy_from_posts(){
    make_taxonomy_from_posts('jjm_authors', 'jjm_author_tax');
}

/**
 * Create slugs/terms in jjm_author_tax taxonomy for all jjm_authors posts
 */
function make_taxonomy_from_posts($post_type, $taxonomy){

    /** Grab the relevant posts */
    $args = array(
        'post_status'       => 'publish',
        'post_type'         => $post_type,
        'posts_per_page'    => -1
    );
    $my_query = new WP_Query($args);
    
    /** Check that some posts were found and loop through them */
    if($my_query->have_posts()) : while($my_query->have_posts()) : $my_query->the_post();
    
            /** Check to see if a term with the same title as the post currently exists in $taxonomy */
            if(!term_exists(get_the_title(), $taxonomy)) :   // It doesn't
            
                /** Add a new term to $taxonomy */
                $args = array(
                    'description'   => get_the_content()
                );
                wp_insert_term(get_the_title(), $taxonomy);
                
            endif;
            
        endwhile;
        
        /** Reset the '$post' global */
        wp_reset_postdata();

    endif;

}

---

Note

This code is tested and 100% working.

本文标签： taxonomyConvert Custom Post Types to Custom Taxonomies