1 files changed, 29 insertions, 0 deletions
diff --git a/lib/gitlab/issuable_sorter.rb b/lib/gitlab/issuable_sorter.rb
new file mode 100644
index 00000000000..d392214867a
--- /dev/null
+++ b/lib/gitlab/issuable_sorter.rb
@@ -0,0 +1,29 @@
+module Gitlab
+  module IssuableSorter
+    class << self
+      def sort(project, issuables, &sort_key)
+        grouped_items = issuables.group_by do |issuable|
+          if issuable.project.id == project.id
+            :project_ref
+          elsif issuable.project.namespace.id == project.namespace.id
+            :namespace_ref
+          else
+            :full_ref
+          end
+        end
+
+        natural_sort_issuables(grouped_items[:project_ref], project) +
+          natural_sort_issuables(grouped_items[:namespace_ref], project) +
+          natural_sort_issuables(grouped_items[:full_ref], project)
+      end
+
+      private
+
+      def natural_sort_issuables(issuables, project)
+        VersionSorter.sort(issuables || []) do |issuable|
+          issuable.to_reference(project)
+        end
+      end
+    end
+  end
+end