RSS for topics in a category

Creates a new route for category RSS

app/controllers/list_controller.rb

@@ -1,6 +1,6 @@
 class ListController < ApplicationController
 
-  before_filter :ensure_logged_in, except: [:index, :category]
+  before_filter :ensure_logged_in, except: [:index, :category, :category_feed]
   skip_before_filter :check_xhr
 
   # Create our filters
@@ -38,15 +38,24 @@ class ListController < ApplicationController
     if params[:category] == Slug.for(SiteSetting.uncategorized_name) or params[:category] == SiteSetting.uncategorized_name
       list = query.list_uncategorized
     else
-      category = Category.where("slug = ? or id = ?", params[:category], params[:category].to_i).includes(:featured_users).first
-      guardian.ensure_can_see!(category)
-      list = query.list_category(category)
+      @category = Category.where("slug = ? or id = ?", params[:category], params[:category].to_i).includes(:featured_users).first
+      guardian.ensure_can_see!(@category)
+      list = query.list_category(@category)
     end
 
     list.more_topics_url = url_for(category_path(params[:category], page: next_page, format: "json"))
     respond(list)
   end
 
+  def category_feed
+    raise Discourse::InvalidParameters.new('Category RSS of "uncategorized"') if params[:category] == Slug.for(SiteSetting.uncategorized_name) || params[:category] == SiteSetting.uncategorized_name
+
+    @category = Category.where("slug = ?", params[:category]).includes(:featured_users).first
+    guardian.ensure_can_see!(@category)
+    @topic_list = TopicQuery.new.list_new_in_category(@category)
+    render 'list', formats: [:rss]
+  end
+
   protected