Move template_format logic out to the request so it's alongside the 'regular' request format.

Use xhr? instead of the expensive trip through Request#accepts.

1 files changed, 13 insertions, 0 deletions

diff --git a/actionpack/lib/action_controller/request.rb b/actionpack/lib/action_controller/request.rb
index 9b02f2c8a1..c91a3387a0 100755
--- a/actionpack/lib/action_controller/request.rb
+++ b/actionpack/lib/action_controller/request.rb
@@ -116,6 +116,19 @@ module ActionController
       @format = Mime::Type.lookup_by_extension(parameters[:format])
     end
 
+    def template_format
+      parameter_format = parameters[:format]
+
+      case
+      when parameter_format.blank? && !xhr?
+        :html
+      when parameter_format.blank? && xhr?
+        :js
+      else
+        parameter_format.to_sym
+      end
+    end
+
     # Returns true if the request's "X-Requested-With" header contains
     # "XMLHttpRequest". (The Prototype Javascript library sends this header with
     # every Ajax request.)