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On my WP blog my goal is to rewrite urls like:

domain.com/blog/**name_of_a_city**/title-of-the-article

Until now I have all my links written like this:

domain.com/blog/title-of-the-article/

Since I don't want to rewrite these existing articles url and change completely all the existing works, I decided to create a new custom post type named "Articles". I've been reading and trying many ways to do so, but I'm having some difficulties.

I thought the best way was to create taxonomies, since I will be adding many "taxonomy" (cities) as I write my blog. For example, if I write an article about Barcelona I would like to be able to add a city as a taxonomy and to see it withing my url.

domain.com/barcelona/this-article-title

Here is my codes:

I've been through the first stages:

-> Creation of a custom post type "Articles"

function cptui_register_my_cpts_article() {

/**
 * Post Type: Articles.
 */

$labels = array(
    "name" => __( "Articles", "rowling" ),
    "singular_name" => __( "Article", "rowling" ),
);

$args = array(
    "label" => __( "Articles", "rowling" ),
    "labels" => $labels,
    "description" => "",
    "public" => true,
    "publicly_queryable" => true,
    "show_ui" => true,
    "delete_with_user" => false,
    "show_in_rest" => true,
    "rest_base" => "",
    "rest_controller_class" => "WP_REST_Posts_Controller",
    "has_archive" => "cities",
    "show_in_menu" => true,
    "show_in_nav_menus" => true,
    "exclude_from_search" => false,
    "capability_type" => "post",
    "map_meta_cap" => true,
    "hierarchical" => false,
    "rewrite" => false,
    "query_var" => true,
    "supports" => array( "title", "editor", "thumbnail", "author" ),
    "taxonomies" => array( "category", "post_tag" ),
);

register_post_type( "article", $args );
}

add_action( 'init', 'cptui_register_my_cpts_article' );

-> I made a custom taxonomy through a plug-in with 2 pre-registrered options (city1 & city2)

class Test_Terms {

function __construct() {
    register_activation_hook( __FILE__,array( $this,'activate' ) );
    add_action( 'init', array( $this, 'create_cpts_and_taxonomies' ) );
} 

function activate() {
    $this->create_cpts_and_taxonomies();
    $this->register_new_terms();
}

function create_cpts_and_taxonomies() {

    $args = array( 
        'hierarchical'                      => true,  
        'labels' => array(
            'name'                          => _x('Cities', 'taxonomy general name' ),
            'singular_name'                 => _x('City', 'taxonomy singular name'),
            'search_items'                  => __('Search city'),
            'popular_items'                 => __('Popular city'),
            'all_items'                     => __('All city'),
            'edit_item'                     => __('Edit city'),
            'edit_item'                     => __('Edit city'),
            'update_item'                   => __('Update city'),
            'add_new_item'                  => __('Add new city'),
            'new_item_name'                 => __('New city'),
            'separate_items_with_commas'    => __('Seperate city with commas'),
            'add_or_remove_items'           => __('Add or remove city'),
            'choose_from_most_used'         => __('Choose from most used city')
        ),  
        'query_var'                         => true,  
        'rewrite'                           => array('slug' =>'city', 'with_front' =>false, 'hierarchical'=>true),        
        'capabilities' => array(
    'manage_terms'  => 'update_plugins',
    'edit_terms'    => 'update_plugins',
    'delete_terms'  => 'update_plugins',
    'assign_terms'  => 'edit_posts'
        )
    );
    register_taxonomy( 'city', array( 'article' ), $args );
}

function register_new_terms() {
    $this->taxonomy = 'city';
    $this->terms = array (
        '0' => array (
            'name'          => 'city1',
            'slug'          => 'city1',
            'description'   => 'for city1',
        ),
        '1' => array (
            'name'          => 'city2',
            'slug'          => 'city2',
            'description'   => 'for city2',
        ),
    );  

    foreach ( $this->terms as $term_key=>$term) {
            wp_insert_term(
                $term['name'],
                $this->taxonomy, 
                array(
                    'description'   => $term['description'],
                    'slug'          => $term['slug'],
                )
            );
        unset( $term ); 
    }

}
}
$Test_Terms = new Test_Terms();

-> Now I can create a "new article" from the admin and register a taxonomy but I want this taxonomy to be included in the url and to have the /name_of_the_artle/ type of permalinks instead of "?". For now I have

/blog/?article=my_new_article

I've been trying to follow this way and this post but I haven't been successful. And one issue as well is that I don't want to rewrite my existing posts but only the ones created under my new custom post type "Articles".

Thank you in advance for all your advices, you could save me!

1

Regarding the code base rewrites, you should be using %city% instead of city, as custom taxonomy used in slug param for rewrites should be enclosed in %TAXONOMY%

WordPress should still be able to redirect your old posts from the old URLs to the new ones. Did you add the filter on the post_type_link?

If you're doing this for a custom post type, you can use this plugin to customize the permalink in the core WordPress permalink configuration area: https://wordpress.org/plugins/custom-post-type-permalinks/

There's also this plugin: https://wordpress.org/plugins/permalinks-customizer/

Which allows you to use custom taxonomies in your permalink structure tags.

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