Front end code is complete for changing categories of topics in bulk

app/controllers/topics_controller.rb

@@ -19,7 +19,8 @@ class TopicsController < ApplicationController
                                           :move_posts,
                                           :merge_topic,
                                           :clear_pin,
-                                          :autoclose]
+                                          :autoclose,
+                                          :bulk]
 
   before_filter :consider_user_for_promotion, only: :show
 
@@ -266,6 +267,11 @@ class TopicsController < ApplicationController
     render 'topics/show', formats: [:rss]
   end
 
+  def bulk
+    topic_ids = params.require(:topic_ids).map {|t| t.to_i}
+    render_json_dump topic_ids: topic_ids
+  end
+
   private
 
   def toggle_mute