Change in custom taxonomy permalink causes 404 error for another custom taxonomy

1 comment

1. After many efforts I have solved it, but it’s not completely what I want, as I had to compromise on one thing and passed some separators in the URL. Example:

   example.com/separator1/parentatx/childtax/separator2/postname/
   

   In order to avoid 404 errors, in case of pagination and another custom taxonomy, I created some rewrite rules. Here is my code:

   First post type and custom taxonomy registration code:

   register_post_type( 
       'article',
       array(
           'public'        => true,
           'hierarchical'  => true,
           'menu_position' => 15,
           'supports'      => array( 'title', 'editor', 'comments', 'thumbnail' ),
           'taxonomies'    => array( '' ),
           'menu_icon'     => get_template_directory_uri().'/img/icon_article.png',
           'query_var'     => true                              
           'rewrite'       => array(
               'slug'       => 'articles/%article_category%/topic/',
               'with_front' => true
           ),
           'has_archive'          => '/all-articles/',
           'register_meta_box_cb' => 'add_article_metaboxes'
       )
   );
   register_taxonomy( 
       'article_category',
       'article',
       array(
           'hierarchical' => true,
           'labels'       => $labels,
           'query_var'    => true,
           'rewrite'      => array( 'slug' => '/articles/', 'hierarchical' => true ),
       )
   );
   

   In the first custom taxonomy, I used ‘articles’ and ‘topic’ as separators; you can use any according to your scenario.

   Second post type and custom taxonomy registration code:

   register_post_type( 
       'gallery',
       array(
           'public'        => true,
           'menu_position' => 15,
           'supports'      => array( 'title', 'editor', 'comments', 'thumbnail' ),
           'taxonomies'    => array( '' ),
           'menu_icon'     => get_template_directory_uri().'/img/icon_gallery.png',
           'query_var'     => true,
           'rewrite'       => array(
               'slug'       => 'galleries/%gallery_category%/images/',
               'with_front' => true
           ),
           'has_archive'          => '/all-galleries/',
           'register_meta_box_cb' => 'add_gallery_metaboxes'
       )
   );
   

   In the second custom taxonomy, I used ‘galleries’ and ‘images’ as separators; you can use any according to your scenario.

   The function for rewrite rules:

   add_filter( 'rewrite_rules_array', 'mmp_rewrite_rules' );
   function mmp_rewrite_rules( $rules ) {
       $newRules  = array();
       //Rules for First Taxonomy
       $newRules['articles/(.+)/(.+)/(topic)/(.+)/?$'] = 'index.php?article=$matches[4]'; 
       $newRules['articles/(.+)/(topic)/(.+)/?$'] = 'index.php?article_category=$matches[1]&article=$matches[3]';
       $newRules['articles/(.+)/(.+)/?([0-9]{1,})/?$'] = 'index.php?article_category=$matches[1]&page=$matches[3]';
       $newRules['articles/(.+)/(.+)/(page)/?([0-9]{1,})/?$'] = 'index.php?article_category=$matches[1]&page=$matches[4]';
       $newRules['articles/(.+)/?$'] = 'index.php?article_category=$matches[1]';
       //Rules for Second Taxonomy
       $newRules['galleries/(.+)/(.+)/(images)/(.+)/?$'] = 'index.php?gallery=$matches[4]'; 
       $newRules['galleries/(.+)/(images)/(.+)/?$'] = 'index.php?gallery_category=$matches[1]&gallery=$matches[3]';
       $newRules['galleries/(.+)/(.+)/?([0-9]{1,})/?$'] = 'index.php?gallery_category=$matches[1]&page=$matches[3]';
       $newRules['galleries/(.+)/(.+)/(page)/?([0-9]{1,})/?$'] = 'index.php?gallery_category=$matches[1]&page=$matches[4]';
       $newRules['galleries/(.+)/?$'] = 'index.php?gallery_category=$matches[1]'; 
   
       return array_merge( $newRules, $rules );
   }
   

   The functions to change the custom post type URL according to custom taxonomy hierarchy:

   function filter_post_type_link( $link, $post ) {
       if ( $post->post_type != 'article' && $post->post_type != 'gallery' )
           return $link;       
       if ( $post->post_type == 'article' ) {
           if ( $cats = get_the_terms( $post->ID, 'article_category' ) ) {
               $link = str_replace( '%article_category%', get_taxonomy_parents( array_pop( $cats )->term_id, 
                   'article_category', false, '/', true ), $link ); // See custom function defined below
           }
           return $link;
       } elseif ( $post->post_type == 'gallery' ) {
           if ( $cats = get_the_terms( $post->ID, 'gallery_category' ) ) {
               $link = str_replace('%gallery_category%', get_taxonomy_parents( array_pop( $cats )->term_id, 
                   'gallery_category', false, '/', true ), $link); // See custom function defined below
           }
           return $link;
       }
   }
   add_filter( 'post_type_link', 'filter_post_type_link', 10, 2 );
   
   // My own function to do what get_category_parents does for other taxonomies
   function get_taxonomy_parents( $id, $taxonomy, $link = false, $separator = '/', $nicename = false, $visited = array() ) {
       $chain = '';   
       $parent = &get_term( $id, $taxonomy );
       if ( is_wp_error( $parent ) ) {
           return $parent;
       }
       if ( $nicename )    
           $name = $parent -> slug; 
       else    
           $name = $parent -> name;
       if ( $parent -> parent && ( $parent -> parent != $parent -> term_id ) && !in_array( $parent -> parent, $visited ) ) {
           $visited[] = $parent -> parent;    
           $chain .= get_taxonomy_parents( $parent -> parent, $taxonomy, $link, $separator, $nicename, $visited );
       }
       if ( $link ) {
           // Nothing, can't get this working :(
       } else {   
           $chain .= $name . $separator;    
       }
       return $chain;    
   }
   

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