Merge pull request #9 from rll/fix_followed_scope

Make sure to scope followed threads by course.

lib/helpers.rb

@@ -76,7 +76,7 @@ helpers do
   end
 
   def handle_threads_query(comment_threads)
-
+    comment_threads = comment_threads.where(:course_id=>params[:course_id])
     if CommentService.config[:cache_enabled]
       query_params = params.slice(*%w[course_id commentable_id sort_key sort_order page per_page user_id])
       memcached_key = "threads_query_#{query_params.hash}"
@@ -105,6 +105,7 @@ helpers do
     sort_key = sort_key_mapper[params["sort_key"]]
     sort_order = sort_order_mapper[params["sort_order"]]
     sort_keyword_valid = (!params["sort_key"] && !params["sort_order"] || sort_key && sort_order)
+
     if not sort_keyword_valid
       {}.to_json
     else