Merge branch 'memoize-namespace-root-ancestor' into 'master'

Memoizing root_ancestor in Namespace See merge request gitlab-org/gitlab-ce!30248

Merge branch 'memoize-namespace-root-ancestor' into 'master'
Memoizing root_ancestor in Namespace See merge request gitlab-org/gitlab-ce!30248
6d867cad · Thong Kuah · ebf289fd · b8563dad · 6d867cad
--- a/app/models/namespace.rb
+++ b/app/models/namespace.rb
@@ -250,7 +250,9 @@ def has_parent?
  end

  def root_ancestor
-    self_and_ancestors.reorder(nil).find_by(parent_id: nil)
+    strong_memoize(:root_ancestor) do
+      self_and_ancestors.reorder(nil).find_by(parent_id: nil)
+    end
  end

  def subgroup?