feat: added custom field for override names | sorting uses name override

plugins/cia-endpoints/includes/class.make-sortby.php

     public function by_alpha( $request ) {
         global $wpdb;
         $res = $wpdb->get_results($wpdb->prepare(
-            "SELECT * FROM wp_posts
-            WHERE post_type = %s 
-            AND post_status='publish'
-            ORDER BY SUBSTRING_INDEX(post_title, ' ', -1)",
+            "SELECT DISTINCT wp_posts.*, 
+            IFNULL(wp_postmeta.meta_value, SUBSTRING_INDEX(wp_posts.post_title, ' ', -1)) AS sort_name
+            FROM wp_posts LEFT JOIN wp_postmeta 
+            ON (wp_postmeta.post_id = wp_posts.ID AND wp_postmeta.meta_key='artist-sort-name') 
+            WHERE wp_posts.post_type='artist' AND wp_posts.post_status='publish'
+            ORDER BY sort_name",
             $this->post_type
         ));
         wp_reset_postdata();

plugins/cia-endpoints/includes/formats.php

     $filtered[content] = $item->post_content;
 
     $filtered[hero] = get_post_meta( $item->ID, 'hero_header', true );
-    
+    if($item->post_type === 'artist') {
+        $filtered[sortname] = get_post_meta( $item->ID, 'artist-sort-name', true );
+    }
     return $filtered;
 }
 

plugins/cia-post-types/cia-post-types.php

         'render_row_cb' => 'cmb_hero_render_row_cb'
     ) );
 }
+
+add_action( 'cmb2_admin_init', 'cmb2_artist_sort_metaboxes' );
+function cmb2_artist_sort_metaboxes() {
+    $cmb = new_cmb2_box( array(
+        'id'            => 'artist_sort_metabox',
+        'title'         => __( 'Name Override', 'cmb2' ),
+        'object_types'  => array( 'artist' ),
+        'context'       => 'normal',
+        'priority'      => 'high',
+        'show_names'    => true,
+        'show_in_rest'  => WP_REST_Server::READABLE
+    ) );
+    $cmb->add_field( array(
+        'name'             => __( 'Alternate Name', 'cmb2' ),
+        'desc'             => __( 'Name to use for alphabetical sorting', 'cmb2' ),
+        'id'               => 'artist-sort-name',
+        'type'             => 'text'
+    ) );
+}