From 7d4438f3e83fac3ce09e5fa0c72cc8ddb105de69 Mon Sep 17 00:00:00 2001
From: Michael Bianco <iloveitaly@gmail.com>
Date: Wed, 11 Jan 2023 04:20:37 -0700
Subject: [PATCH] fix: print error when __CATEGORIES__ used and no categories
 set (#388)

* Print error when categories are empty

* lint fix
---
 src/views/QueryExplorer.vue | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/src/views/QueryExplorer.vue b/src/views/QueryExplorer.vue
index 931e53c2..ef351579 100644
--- a/src/views/QueryExplorer.vue
+++ b/src/views/QueryExplorer.vue
@@ -83,7 +83,12 @@ RETURN = sort_by_duration(merged_events);
       // replace magic string `__CATEGORIES__` in query text with latest category rule
       if (_.includes(query, '__CATEGORIES__')) {
         const categoryRules = useCategoryStore().classes_for_query;
-        // const classes_str = JSON.stringify(params.classes).replace(/\\\\/g, '\\');
+
+        if (useCategoryStore().classes_for_query.length === 0) {
+          this.error = '__CATEGORIES__ was used in query but no categories have been defined yet.';
+          return;
+        }
+
         query = query.replace('__CATEGORIES__', JSON.stringify(categoryRules));
       }