Show only specific categories in permalinks for custom post type in WordPress

Question

I tried to ask this question in the Wordpress Devlopment network with no success, I'm trying to display only 3 specific categories in permalinks for custom-post-type categories.

Right now the permalinks structure (that is the structure given by the theme i'm using and that i'm modifying through a child theme)is as follows:

www.myfoodblog.com/recipes/the-post-title/
         ^            ^           ^    
       root   custom-post-type  title  

some post are under 3 categories that i would like to display in permalinks which are restaurant, users and admin to get something like this

www.myfoodblog.com/recipes/restaurant/the-post-title/

www.myfoodblog.com/recipes/users/the-post-title/

www.myfoodblog.com/recipes/admin/the-post-title/

leaving the original structure for posts that are not in those categories.

I tried using this plugin but it will display the custom post type category for all posts.

I also tried to follow the instructions provided in this question but it's not working, no changes are made in the permalinks structure.

Any advice is much appreciated.

Answer 1

You have to work with both post_type_link and add a rewrite rule

function recipes_post_link( $post_link, $id = 0 ){
    $post = get_post( $id );
    if ( is_object( $post ) ){
        $terms = get_the_terms( $post->ID, 'recipe-category' );
        foreach($terms as $term) {
            if( $term->slug == 'restaurants' || $term->slug == 'users'){
                return str_replace( site_url()."/recipes" , site_url()."/recipes/".$term->slug , $post_link );
            }
        }
    }
    return $post_link;
}
add_filter( 'post_type_link', 'recipes_post_link', 1, 3 );

function custom_rewrite_basic() {
  add_rewrite_rule('^recipes/(.+)/(.+)', 'index.php?recipe=$matches[2]', 'top');
}
add_action('init', 'custom_rewrite_basic');

Answer 2

Create Post Type

add_action( 'init', 'codex_recipes_init' );
/**
 * Register a recipes post type.
 *
 * @link http://codex.wordpress.org/Function_Reference/register_post_type
 */
function codex_recipes_init() {
    $labels = array(
        'name'               => _x( 'Recipes', 'post type general name', 'your-plugin-textdomain' ),
        'singular_name'      => _x( 'Recipe', 'post type singular name', 'your-plugin-textdomain' ),
        'menu_name'          => _x( 'Recipes', 'admin menu', 'your-plugin-textdomain' ),
        'name_admin_bar'     => _x( 'Recipe', 'add new on admin bar', 'your-plugin-textdomain' ),
        'add_new'            => _x( 'Add New', 'recipe', 'your-plugin-textdomain' ),
        'add_new_item'       => __( 'Add New Recipe', 'your-plugin-textdomain' ),
        'new_item'           => __( 'New Recipe', 'your-plugin-textdomain' ),
        'edit_item'          => __( 'Edit Recipe', 'your-plugin-textdomain' ),
        'view_item'          => __( 'View Recipe', 'your-plugin-textdomain' ),
        'all_items'          => __( 'All Recipes', 'your-plugin-textdomain' ),
        'search_items'       => __( 'Search Recipes', 'your-plugin-textdomain' ),
        'parent_item_colon'  => __( 'Parent Recipes:', 'your-plugin-textdomain' ),
        'not_found'          => __( 'No recipes found.', 'your-plugin-textdomain' ),
        'not_found_in_trash' => __( 'No recipes found in Trash.', 'your-plugin-textdomain' )
    );

    $args = array(
        'labels'             => $labels,
        'description'        => __( 'Description.', 'your-plugin-textdomain' ),
        'public'             => true,
        'publicly_queryable' => true,
        'show_ui'            => true,
        'show_in_menu'       => true,
        'query_var'          => true,
        'rewrite'            => array( 'slug' => 'recipes/%type%' ),
        'capability_type'    => 'post',
        'has_archive'        => 'recipes',
        'hierarchical'       => false,
        'menu_position'      => null,
        'supports'           => array( 'title', 'editor', 'author', 'thumbnail', 'excerpt', 'comments' )
    );

    register_post_type( 'recipes', $args );
}

Important: look on rewrite rule: 'rewrite'=> array( 'slug' => 'recipes/%type%' ),

Create Custom Taxonomy

// hook into the init action and call create_recipes_taxonomies when it fires
add_action( 'init', 'create_recipes_taxonomies', 0 );

function create_recipes_taxonomies() {

    // Add new taxonomy, NOT hierarchical (like tags)
    $labels = array(
        'name'                       => _x( 'Type', 'taxonomy general name', 'textdomain' ),
        'singular_name'              => _x( 'Type', 'taxonomy singular name', 'textdomain' ),
        'search_items'               => __( 'Search Types', 'textdomain' ),
        'popular_items'              => __( 'Popular Types', 'textdomain' ),
        'all_items'                  => __( 'All Types', 'textdomain' ),
        'parent_item'                => null,
        'parent_item_colon'          => null,
        'edit_item'                  => __( 'Edit Type', 'textdomain' ),
        'update_item'                => __( 'Update Type', 'textdomain' ),
        'add_new_item'               => __( 'Add New Type', 'textdomain' ),
        'new_item_name'              => __( 'New Type Name', 'textdomain' ),
        'separate_items_with_commas' => __( 'Separate types with commas', 'textdomain' ),
        'add_or_remove_items'        => __( 'Add or remove types', 'textdomain' ),
        'choose_from_most_used'      => __( 'Choose from the most used types', 'textdomain' ),
        'not_found'                  => __( 'No types found.', 'textdomain' ),
        'menu_name'                  => __( 'Types', 'textdomain' ),
    );

    $args = array(
        'hierarchical'          => true,
        'labels'                => $labels,
        'show_ui'               => true,
        'show_admin_column'     => true,
        'update_count_callback' => '_update_post_term_count',
        'query_var'             => true,
        'rewrite'               => array( 'slug' => 'type' ),
    );

    register_taxonomy( 'type', 'recipes', $args );
}

Add Filter Post Type Link

function recipes_post_link( $post_link, $id = 0 ){
    $post = get_post( $id );  
    if ( is_object( $post ) ){
        $terms = wp_get_object_terms( $post->ID, 'type' );
        if( $terms ){
            return str_replace( '%type%' , $terms[0]->slug , $post_link );
        }
    }
    return $post_link;  
}
add_filter( 'post_type_link', 'recipes_post_link', 1, 3 );

Important: After all go to permalink options and reset it.