1 files changed, 15 insertions, 0 deletions
diff --git a/app/models/concerns/routable.rb b/app/models/concerns/routable.rb
index 1108a64c59e..2b93aa30c0f 100644
--- a/app/models/concerns/routable.rb
+++ b/app/models/concerns/routable.rb
@@ -60,6 +60,21 @@ module Routable
         joins(:route).where(wheres.join(' OR '))
       end
     end
+
+    # Builds a relation to find multiple objects that are nested under user membership
+    #
+    # Usage:
+    #
+    #     Klass.member_descendants(1)
+    #
+    # Returns an ActiveRecord::Relation.
+    def member_descendants(user_id)
+      joins(:route).
+        joins("INNER JOIN routes r2 ON routes.path LIKE CONCAT(r2.path, '/%')
+               INNER JOIN members ON members.source_id = r2.source_id
+               AND members.source_type = r2.source_type").
+        where('members.user_id = ?', user_id)
+    end
   end
 
   private