Add archived param to the json response

app/serializers/group_child_entity.rb

@@ -31,7 +31,7 @@ class GroupChildEntity < Grape::Entity
   end
 
   # Project only attributes
-  expose :star_count,
+  expose :star_count, :archived,
          if: lambda { |_instance, _options| project? }
 
   # Group only attributes