diff --git a/app/controllers/comments_controller.rb b/app/controllers/comments_controller.rb
index 3f51ffb30..425a144f4 100644
--- a/app/controllers/comments_controller.rb
+++ b/app/controllers/comments_controller.rb
@@ -7,9 +7,9 @@ class CommentsController < ApplicationController
   def index
     params[:group_by] ||= "comment" if params[:search].present?
 
-    if params[:group_by] == "comment" || request.format == Mime::Type.lookup("application/atom+xml")
+    if params[:group_by] == "comment" || request.format.atom?
       index_by_comment
-    elsif request.format == Mime::Type.lookup("text/javascript")
+    elsif request.format.js?
       index_for_post
     else
       index_by_post
diff --git a/app/controllers/forum_topics_controller.rb b/app/controllers/forum_topics_controller.rb
index 04b00e9f0..8bb747164 100644
--- a/app/controllers/forum_topics_controller.rb
+++ b/app/controllers/forum_topics_controller.rb
@@ -20,7 +20,7 @@ class ForumTopicsController < ApplicationController
 
   def index
     params[:search] ||= {}
-    params[:search][:order] ||= "sticky" if request.format == Mime::Type.lookup("text/html")
+    params[:search][:order] ||= "sticky" if request.format.html?
     params[:limit] ||= 40
 
     @forum_topics = ForumTopic.paginated_search(params).includes(model_includes(params))
@@ -29,7 +29,7 @@ class ForumTopicsController < ApplicationController
   end
 
   def show
-    if request.format == Mime::Type.lookup("text/html")
+    if request.format.html?
       @forum_topic.mark_as_read!(CurrentUser.user)
     end
     @forum_posts = ForumPost.search(:topic_id => @forum_topic.id).reorder("forum_posts.id").paginate(params[:page])
diff --git a/app/controllers/posts_controller.rb b/app/controllers/posts_controller.rb
index 3f34454fa..559082545 100644
--- a/app/controllers/posts_controller.rb
+++ b/app/controllers/posts_controller.rb
@@ -21,7 +21,7 @@ class PostsController < ApplicationController
   def show
     @post = Post.find(params[:id])
 
-    if request.format == Mime::Type.lookup("text/html")
+    if request.format.html?
       @comments = @post.comments
       @comments = @comments.includes(:creator)
       @comments = @comments.includes(:votes) if CurrentUser.is_member?