:poop: trying to add materials taxonomy

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

             'show_in_rest'       => true,
             'publicly_queryable' => false
         ];
-        
-        if( $this->post_type == 'artist' ) { $args['taxonomies'] = ['category']; }
-        if( $this->post_type == 'event' ) { $args['taxonomies'] = ['type']; }
 
         register_post_type( $this->post_type, $args );
     }
         'type'             => 'text'
     ) );
 }
+
+function create_materials_taxonomy() {
+    $post_types_that_show_materials = [ 'artist' ];
+    register_taxonomy("material", $post_types_that_show_materials, [ "label" => "Materials"]);
+}
+add_action('init', 'create_materials_taxonomy');