Change slug of registered custom post type in child theme

Question

I successfully renamed a custom post type registered by my parent theme in my child theme using this method. The problem is, my permalinks haven't changed. So when I change portfolio to homepage and use the permalink structure /%category%/%postname%/ my URLs still look like mysite.com/portfolio/page/ instead of mysite.com/homepage/page/.

this is the code I am using to change my CPT:

add_action( 'wp_loaded', 'wpse_19240_change_home_labels', 20 );

function wpse_19240_change_home_labels()
{
global $wp_post_types;
$b = 'portfolio';

if ( empty ( $wp_post_types[ $b ] )
    or ! is_object( $wp_post_types[ $b ] )
    or empty ( $wp_post_types[ $b ]->labels )
    )
    return;

$wp_post_types[ $b ]->labels->name               = 'Sliders';
$wp_post_types[ $b ]->labels->singular_name      = 'Slider';
$wp_post_types[ $b ]->labels->add_new_item       = 'Add New Slider';
$wp_post_types[ $b ]->labels->edit_item          = 'Edit Slider';
$wp_post_types[ $b ]->labels->new_item           = 'New Slider';
$wp_post_types[ $b ]->labels->view_item          = 'View Slider';
$wp_post_types[ $b ]->labels->search_items       = 'Search Sliders';
$wp_post_types[ $b ]->labels->not_found          = 'No sliders found.';
$wp_post_types[ $b ]->labels->not_found_in_trash = 'No sliders found in Trash.';
$wp_post_types[ $b ]->labels->menu_name          = 'Homepage Sliders';
$wp_post_types[ $b ]->labels->all_items          = 'All Sliders';
$wp_post_types[ $b ]->labels->add_new            = 'Add New Slider';
$wp_post_types[ $b ]->labels->name_admin_bar     = 'Slider';
}

I sucessfully changed the slug by using:

function change_slug_of_post_type_portfolio() {
    register_post_type('portfolio', array('rewrite' => array ('slug' => 'homepage',)));
}
add_action('init', 'change_slug_of_post_type_portfolio', 20);

But now I get a 404 error when I navigate to the page generated by the system: mysite.com/homepage/page/

I made sure to make a single-homepage.php and I have tried adding flush_rewrite_rules(); as recommended in this post but to no avail.

Answer 1

with your code you completely redefine your CPT instead of just modifying the slug maybe this change the public access

try this :

$args = get_post_type_object("portfolio");
$args->rewrite["slug"] = "homepage";
register_post_type($args->name, $args);