"Current" class on a singular page menu item with custom post types?

Question

I'm struggling to get a "current" class for the corresponding menu item when I'm on a singular (child) page of a custom post type. These are the arguments I used when registering the post type with register_post_type:

    array(
        'labels' => array(...),
        'public' => true,
        'has_archive' => true,
        'capability_type' => 'post',
        'hierarchical' => true,
        'menu_position' => 5,
        'supports' => array('title', 'editor', 'thumbnail'),
        )

On the archive page everything is working fine and I do get the "current-menu-item" class for the current post types menu item. What can I do to make it work? I'm using wp_nav_menu(); to generate the menu.

Answer 1

Given that the markup of your menu does not seems to generating all of the classes I'd expect to see, I'll guess at the problem.

1. Your theme is using a custom Walker
2. Or something-- theme or plugin-- has added a filter to (probably) wp_nav_menu_css.
3. Though there are other filters that could be used.

To fix it, or try to, make sure your theme does not include a walker argument when it calls wp_nav_menu and search your theme and plugins for wp_nav_menu_css and other relevant filters.

If it is a walker you can remove that walker argument, though it may effect other theme functionality. If it is a filter it can be removed with remove_filter()