categories - Assign parent category to all posts that are already assigned to child category

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All my website's posts are assigned to subcategories, but not to their parent categories too:

Is there someway that I could massively assign posts to their parent categories too?

My website has more than 3k posts, so I need to find a quick way to do this. I didn't find any plugin that could help me. Any suggestions please?

All my website's posts are assigned to subcategories, but not to their parent categories too:

Is there someway that I could massively assign posts to their parent categories too?

My website has more than 3k posts, so I need to find a quick way to do this. I didn't find any plugin that could help me. Any suggestions please?

• categories

Share Improve this question asked Feb 6, 2014 at 10:32 ktsixitktsixit 19311 gold badge44 silver badges1616 bronze badges

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2 Answers 2

Sorted by: Reset to default 0

be careful and only run it once

$_query = new WP_Query( array(
    'post_type' => 'post',
    'posts_per_page' => -1,
 ) );
function complete_parent_category( $term_id, $dep=array() ) {
    $category = get_term( $term_id, 'category' );
    $dep[ $category->term_id ] = $category->slug;
    if( $category->parent ) {
      $dep = complete_parent_category( $category->parent, $dep );
    }
    return $dep;
}
echo '<pre>';
while( $_query->have_posts() ) {
  $_query->next_post();
  echo '<br /><strong>'.$_query->post->post_title .'</strong> |>> ';
  $cat_post = array();
  $cats = get_the_category( $_query->post->ID );
  if( count( $cats ) ) {
    foreach ($cats as $cat) {
      $cat_post[ $cat->term_id ] = $cat->slug;
      if( $cat->parent == 0 ) continue; 
      $category_object = get_term( $cat, 'category' );
      $cat_post = complete_parent_category( $cat->parent, $cat_post );
    }
  }
  if( count( $cats ) == count( $cat_post ) ) return;
  $data = array(
      'ID'           => $_query->post->ID,
      'post_category' => array_keys($cat_post),
  );
  wp_update_post( $data );
}

wp_reset_postdata();

exit();

Paste this into your functions.php file. The function will be triggered when you access the WordPress admin dashboard. The function runs only once because after its first run, an option assign_parent_terms_completed is set in the database. On subsequent runs, the function checks for this option and doesn't execute if it's set.

function assign_parent_terms_to_posts() {
    // Get all the posts
    $args = array(
        'post_type' => 'post',
        'posts_per_page' => -1
    );
    $query = new WP_Query($args);

    // If there are posts, loop through each one
    if($query->have_posts()) {
        while($query->have_posts()) {
            $query->the_post();

            // Get the child terms assigned to the post
            $child_terms = get_the_terms(get_the_ID(), 'category');

            // Loop through each child term
            foreach($child_terms as $child_term) {
                // If the term has a parent
                if(isset($child_term -> parent) && $child_term -> parent != 0) {
                    // Assign the parent term to the post
                    wp_set_post_terms(get_the_ID(), array($child_term -> parent), 'category', true);
                }
            }
        }
    }
    wp_reset_postdata(); // Reset the post data
}

// Hook the function to the 'admin_init' action
add_action('admin_init', 'run_assign_parent_terms_once');

function run_assign_parent_terms_once() {
    // Check if the function has already been run
    if(!get_option('assign_parent_terms_completed')) {
        assign_parent_terms_to_posts();
        // Mark the function as run
        update_option('assign_parent_terms_completed', true);
    }
}

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