How to prevent new terms being added to a custom taxonomy?

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I’ve created some custom taxonomies using register_taxonomy, but I want to prevent new terms from being added. I noticed that there is a ‘capabilities’ argument available in register_taxonomy, is that what I should be using and if so, how would I use it?

Here’s some of my code, I’m using a plugin I created to add the taxonomies (hence the public static function part). Is there an easy way to prevent new terms being created for my taxonomy?

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Thanks

Osu 

public static function register_directory_styles_taxonomy()
    {
        $labels = array(
            'name'                      => 'Music styles',
            'singular_name'             => 'Music style',
            'search_items'              => 'Search music styles',
            'all_items'                 => 'All music styles',
            'parent_item'               => 'Parent music style',
            'edit_item'                 => 'Edit music style',
            'update_item'               => 'Update music style',
            'add_new_item'              => 'Add new music style',
            'new_item_name'             => 'New music style',
            'choose_from_most_used'     => 'Choose from most used music styles'
        );

        $args = array(
            'hierarchical'  => true,
            'labels'        => $labels,
            'rewrite'       => false
            // 'show_ui'        => false
        );

        register_taxonomy( 'ibmstyles', 'ibmdirectory', $args );
    }
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2 comments

  1. You can block addition of new terms with a filter on pre_insert_term. The source is helpful in working out what you can do.

    add_action( 'pre_insert_term', function ( $term, $taxonomy )
{
    return ( 'yourtax' === $taxonomy )
        ? new WP_Error( 'term_addition_blocked', __( 'You cannot add terms to this taxonomy' ) )
        : $term;
}, 0, 2 );

  2. It would seem the easiest way to do this has been answered here.

    The solution was modifying the taxonomy’s capabilities array:

    'capabilities' => array(
    'manage_terms' => '',
    'edit_terms' => '',
    'delete_terms' => '',
    'assign_terms' => 'edit_posts'
),

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