I'd suggest this... which is doing array sorting, but I think you don't have a choice with two unrelated object types.
@combined = (@feeds.to_a + @questions.to_a).sort{|a,b| b.created_at <=> a.created_at}Then in the view...
<% @combined.each do |combined| %><%= render combined %><% end %>The beauty of the render is that it will render a partial appropriate to the type of object. If combined s a Feed object the partial used will be feeds/_feed but if it's a Question object it will use the partial questions/_question