Ticket #2825: true-cat-exclusion.diff

wp-includes/query.php

@@ -708 +708 @@
                         $q['cat'] = addslashes_gpc($q['cat']);
                         $join = " LEFT JOIN $wpdb->post2cat ON ($wpdb->posts.ID = $wpdb->post2cat.post_id) ";
                         $cat_array = preg_split('/[,\s]+/', $q['cat']);
-                        $in_cats = $out_cats = '';
+                        $in_cats = $out_cats = $out_posts = '';
                         foreach ( $cat_array as $cat ) {
                                 $cat = intval($cat);
                                 $in = strstr($cat, '-') ? false : true;
@@ -722 +722 @@
                         $out_cats = substr($out_cats, 0, -2);
                         if ( strlen($in_cats) > 0 )
                                 $in_cats = " AND category_id IN ($in_cats)";
-                        if ( strlen($out_cats) > 0 )
-                                $out_cats = " AND category_id NOT IN ($out_cats)";
+                        if ( strlen($out_cats) > 0 ) {
+                                $ids = $wpdb->get_col("SELECT post_id FROM $wpdb->post2cat WHERE category_id IN ($out_cats)");
+                                if ( is_array($ids) && count($ids > 0) ) {
+                                        foreach ( $ids as $id )
+                                                $out_posts .= "$id, ";
+                                        $out_posts = substr($out_posts, 0, -2);
+                                }
+                                if ( strlen($out_posts) > 0 )
+                                        $out_cats = " AND ID NOT IN ($out_posts)";
+                        }
                         $whichcat = $in_cats . $out_cats;
                         $distinct = 'DISTINCT';
                 }