Don't cache GraphQL results if they contain transform generation URLs

Fixes #18581

Author: brandonkelly

CHANGELOG.md

@@ -1,5 +1,9 @@
 # Release Notes for Craft CMS 4
 
+## Unreleased
+
+- Fixed a bug where GraphQL results were getting cached even if they contained transform generation URLs. ([#18581](https://github.com/craftcms/cms/issues/18581))
+
 ## 4.17.11 - 2026-03-17
 
 - Fixed an error that could occur after running the `utils/fix-field-layout-uids` command. ([#18516](https://github.com/craftcms/cms/issues/18516))

src/services/Gql.php

@@ -534,7 +534,7 @@ public function executeQuery(
 
                 [$dep, $duration] = $elementsService->stopCollectingCacheInfo();
 
-                if (empty($event->result['errors']) && $cacheKey) {
+                if (empty($event->result['errors']) && $cacheKey && $this->shouldCache($event->result ?? [])) {
                     $this->setCachedResult($cacheKey, $event->result, $dep, $duration);
                 }
             }
@@ -545,6 +545,23 @@ public function executeQuery(
         return $event->result ?? [];
     }
 
+    private function shouldCache(array $result): bool
+    {
+        foreach ($result as $value) {
+            if (is_string($value)) {
+                if (str_contains(stripslashes($value), 'assets/generate-transform')) {
+                    return false;
+                }
+            } elseif (is_array($value)) {
+                if (!$this->shouldCache($value)) {
+                    return false;
+                }
+            }
+        }
+
+        return true;
+    }
+
     /**
      * Invalidates all GraphQL result caches.
      *