Added materials to Events and Exhibition

plugins/cia-post-types/includes/custom-taxonomies.php

 <?php
     function create_materials_taxonomy() {
         $post_types_that_show_materials = [
-            'artist', 'guide', 'short',
+            'artist', 'exhibition', 'event', 'guide', 'short',
             'object', 'publication', 'technique'
         ];
         register_taxonomy('material', $post_types_that_show_materials, ['label' => 'Materials']);

vue-theme/functions.php

 function set_custom_edit_artist_columns($columns) {
     $date = $columns['date'];
     unset( $columns['date'] );
-    $columns['artist_type'] = __('Artist Type', 'my-text-domain' );
-    $columns['material'] = __('Material', 'my-text-xx' );
+    $columns['artist_type'] = __('Artist Type' );
+    $columns['material'] = __('Material' );
     $columns['date'] = $date;
     return $columns;
 }
 function set_custom_edit_event_columns($columns) {
     $date = $columns['date'];
     unset( $columns['date'] );
-    $columns['event_type'] = __('Event Type');
+    $columns['event_type'] = __('Event Type' );
+    $columns['material'] = __('Material' );
     $columns['date'] = $date;
     return $columns;
 }
             $terms = get_the_term_list( $post_id , 'event_type' , '' , ', ' , '' );
             echo is_string( $terms ) ? $terms : '—';
             break;
+            // display a list of material terms assigned to the post 
+        case 'material' :
+            $terms = get_the_term_list( $post_id , 'material' , '' , ', ' , '' );
+            echo is_string( $terms ) ? $terms : '—';
+            break;
+    }
+}
+
+// Add the custom columns for EXHIBITION:
+add_filter( 'manage_exhibition_posts_columns', 'set_custom_edit_exhibition_columns' );
+function set_custom_edit_exhibition_columns($columns) {
+    $date = $columns['date'];
+    unset( $columns['date'] );
+    $columns['material'] = __('Material');
+    $columns['date'] = $date;
+    return $columns;
+}
+// Add the data to the custom columns for EXHIBITION:
+add_action( 'manage_exhibition_posts_custom_column' , 'custom_exhibition_column', 10, 2 );
+function custom_exhibition_column( $column, $post_id ) {
+    switch ( $column ) {
+        case 'material' :
+            $terms = get_the_term_list( $post_id , 'material' , '' , ', ' , '' );
+            echo is_string( $terms ) ? $terms : '—';
+            break;
     }
 }
 

vue-theme/src/utils/helpers.js

 
 const sortTypes = {
     alpha: 'by-alpha',
-u    material: 'by-material',
+    material: 'by-material',
     artist: 'by-artist',
     episode: 'by-episode',
     upcoming: 'by-upcoming',