Ticket #12533: 12533.diff

query.php

@@ -1965 +1965 @@
                         if ( '' != $q['taxonomy'] ) {
                                 $taxonomy = $q['taxonomy'];
                                 $tt[$taxonomy] = $q['term'];
-                                $terms = get_terms($q['taxonomy'], array('slug'=>$q['term']));
+                                $terms = get_terms($q['taxonomy'], array('slug' => $q['term'], 'hide_empty' => false));
                         } else {
                                 foreach ( $GLOBALS['wp_taxonomies'] as $taxonomy => $t ) {
                                         if ( $t->query_var && '' != $q[$t->query_var] ) {
-                                                $terms = get_terms($taxonomy, array('slug'=>$q[$t->query_var]));
+                                                $terms = get_terms($taxonomy, array('slug' => $q[$t->query_var]));
                                                 if ( !is_wp_error($terms) )
                                                         break;
                                         }
                                 }
                         }
-                        if ( is_wp_error($terms) || empty($terms) ) {
+                        if ( is_wp_error($terms) ) {
                                 $whichcat = " AND 0 ";
                         } else {
-                                foreach ( $terms as $term )
+                                foreach ( $terms as $term ) {
                                         $term_ids[] = $term->term_id;
+                                        if ( is_taxonomy_hierarchical($taxonomy) ) {
+                                                $children = get_term_children($term->term_id, $taxonomy);
+                                                if ( is_wp_error($children) )
+                                                        continue;
+                                                $term_ids = array_merge($term_ids, $children);
+                                        }
+                                }
                                 $post_ids = get_objects_in_term($term_ids, $taxonomy);
                                 if ( !is_wp_error($post_ids) && count($post_ids) ) {
                                         $whichcat .= " AND $wpdb->posts.ID IN (" . implode(', ', $post_ids) . ") ";