1 files changed, 39 insertions, 0 deletions
diff --git a/lib/gitlab/patch/active_record_query_cache.rb b/lib/gitlab/patch/active_record_query_cache.rb
new file mode 100644
index 00000000000..71d66bdbe02
--- /dev/null
+++ b/lib/gitlab/patch/active_record_query_cache.rb
@@ -0,0 +1,39 @@
+# frozen_string_literal: true
+
+# Fixes a bug where the query cache isn't aware of the shared
+# ActiveRecord connection used in tests
+# https://github.com/rails/rails/issues/36587
+
+# To be removed with https://gitlab.com/gitlab-org/gitlab-ce/issues/64413
+
+module Gitlab
+  module Patch
+    module ActiveRecordQueryCache
+      # rubocop:disable Gitlab/ModuleWithInstanceVariables
+      def enable_query_cache!
+        @query_cache_enabled[connection_cache_key(current_thread)] = true
+        connection.enable_query_cache! if active_connection?
+      end
+
+      def disable_query_cache!
+        @query_cache_enabled.delete connection_cache_key(current_thread)
+        connection.disable_query_cache! if active_connection?
+      end
+
+      def query_cache_enabled
+        @query_cache_enabled[connection_cache_key(current_thread)]
+      end
+
+      def active_connection?
+        @thread_cached_conns[connection_cache_key(current_thread)]
+      end
+
+      private
+
+      def current_thread
+        @lock_thread || Thread.current
+      end
+      # rubocop:enable Gitlab/ModuleWithInstanceVariables
+    end
+  end
+end