So after a lot of time spent and a lot of trying different things, I finally figured out the right way to do this. I used MonkeyMan Rewrite Analyzer and the WP Debug Bar to help figure out how to construct the rewrite.
So first, my custom post type URLs are rewritten as such:
// Artist Rewrite Args
$rewrite = array(
'slug' => 'artist',
'with_front' => true,
'pages' => true,
'feeds' => true,
);
// Portfolio Rewrite Args
$rewrite = array(
'slug' => 'portfolio',
'with_front' => false,
'pages' => true,
'feeds' => true,
);
Then, I register a rewrite tag %artistname%
for the artist name, which we’ll grab via a WP_Query
function, as well as a rewrite rule to fill in the slug to be occupied by the artist’s name, which will come before the slug of the portfolio being shown.
// Portfolio Rewrite Rule
add_action( 'init', 'portfolio_rewrite_tag' );
function portfolio_rewrite_tag() {
add_rewrite_tag('%artistname%','[^/]+');
// defines the rewrite structure for 'portfolios'
// says that if the portfolio URL matches this rule, then it should display the 'artists' post whose post name matches the last slug set
add_rewrite_rule( '^artist/[^/]+/([^/]+)/?$','index.php?portfolio=$matches[1]','top' );
}
Next, I refined the URL filter to check if it’s a portfolio post, and if so, pull the slug of the first connected artist
, and then plop that slug into the post link string.
// Grab connected artist name and swap it into the URL
function filter_portfolio_link( $post_link, $post ) {
if ( $post->post_type === 'portfolio' ) {
$connected = new WP_query( array(
'post_type' => 'artist',
'connected_type' => 'portfolios_to_artists',
'connected_items' => $post,
'nopaging' => true,
) );
if ($connected->have_posts() ) {
$first = true;
foreach ( $connected as $connectedPost ) {
setup_postdata($connectedPost);
if ($connectedPost->post_type === 'artist') {
if ($first) {
$artistName = $connectedPost->post_name;
$first = false;
}
}
}
$post_link = str_replace( 'portfolio', 'artist/' . $artistName, $post_link );
}
}
return $post_link;
}
add_filter( 'post_type_link', 'filter_portfolio_link', 10, 2);
So that’s it! While I didn’t use the same plugin as discussed in the thread Nested custom post types with permalinks, the whole thread was super helpful in arriving at this conclusion.