Taxonomies not appearing in columns on dashboard

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Call register_taxonomy() with 'show_admin_column' => TRUE and WordPress will create your columns automatically. This parameter was added in version 3.5. You don’t need a custom filter anymore.

I have written a small plugin to demonstrate this case: t5-taxonomy-location.

This is the registration code:

protected function register_taxonomy()
{
    $this->set_labels();

    $args = array (
        'labels'            => $this->labels,
        'label'             => $this->labels['singular_name'],
        'public'            => TRUE,
        'show_in_nav_menus' => TRUE,
        'show_ui'           => TRUE,
        'show_tagcloud'     => TRUE,
        'rewrite'           => array (
            'slug'       => _x( 'location', 'slug', 'plugin_t5_tax_location' ),
            'with_front' => apply_filters( 't5_tax_location_slug_front', FALSE )
        ),
        'query_var'         => 'location',
        'hierarchical'      => TRUE,
        // New in WordPress 3.5
        // see http://core.trac.wordpress.org/ticket/21240
        'show_admin_column' => TRUE
    );

    $tax_post_types = apply_filters(
        't5_tax_location_post_types',
        array( 'post', 'page', 'attachment' )
    );

    register_taxonomy( $this->taxonomy, $tax_post_types, $args );
}

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