Remove requirement for id for #markdown_cache_key

It's not needed anymore as we require `#cache_key` instead.

1 files changed, 2 insertions, 2 deletions

diff --git a/lib/gitlab/markdown_cache/redis/store.rb b/lib/gitlab/markdown_cache/redis/store.rb
index 2d4a89d9f1c..0f954404808 100644
--- a/lib/gitlab/markdown_cache/redis/store.rb
+++ b/lib/gitlab/markdown_cache/redis/store.rb
@@ -43,9 +43,9 @@ module Gitlab
         end
 
         def markdown_cache_key
-          unless @subject.respond_to?(:id)
+          unless @subject.respond_to?(:cache_key)
             raise Gitlab::MarkdownCache::UnsupportedClassError,
-                  "This class has no id to use for caching"
+                  "This class has no cache_key to use for caching"
           end
 
           "markdown_cache:#{@subject.cache_key}"