Using custom taxonomy when registering a new custom post type

Question

I'm creating my own custom post type and here is the code for this:

add_action( 'init', 'create_gallery_post_type' );
function create_gallery_post_type() {
  register_post_type( 'gallery',
    array(
      'labels' => array(
        'name' => __( 'Galleries' ),
        'singular_name' => __( 'Gallery' )
      ),
        'publicly_queryable' => true,
        'show_ui' => true,
        'query_var' => true,
        'rewrite' => true,
        'capability_type' => 'post',
        'hierarchical' => false,
        'menu_position' => null,
        'taxonomies' => array('category'),
        'supports' => array('title','editor','thumbnail')
    )
  );
}

I have another custom post type that has it's own custom category taxonomy and that is called `portfolio-category'. I'd like to use the same taxonomy for this post type since they would be the same values and I only have to enter them in one place.

I tried to make it say:

'taxonomies' => array('portfolio-category')

This didn't show me the categories link under my Gallery post type though. Any ideas? Thanks!

Answer 1

What you have should work in principle. Note that taxonomies argument needs existing taxonomy, that is one that is already registered at the time you are registering CPT.

If the timing is problematic to get right during registration, you could also use register_taxonomy_for_object_type() to create association between the two separately from registration process.