3 files changed, 10 insertions, 0 deletions
diff --git a/actionpack/lib/action_view/template/handlers/builder.rb b/actionpack/lib/action_view/template/handlers/builder.rb
index 788dc93326..f412228752 100644
--- a/actionpack/lib/action_view/template/handlers/builder.rb
+++ b/actionpack/lib/action_view/template/handlers/builder.rb
@@ -5,6 +5,8 @@ module ActionView
     class Builder < TemplateHandler
       include Compilable
 
+      self.default_format = Mime::XML
+
       def compile(template)
         "_set_controller_content_type(Mime::XML);" +
           "xml = ::Builder::XmlMarkup.new(:indent => 2);" +
diff --git a/actionpack/lib/action_view/template/handlers/erb.rb b/actionpack/lib/action_view/template/handlers/erb.rb
index fdcb108ffc..95f11d6490 100644
--- a/actionpack/lib/action_view/template/handlers/erb.rb
+++ b/actionpack/lib/action_view/template/handlers/erb.rb
@@ -13,6 +13,8 @@ module ActionView
       cattr_accessor :erb_trim_mode
       self.erb_trim_mode = '-'
 
+      self.default_format = Mime::HTML
+
       def compile(template)
         src = ::ERB.new("<% __in_erb_template=true %>#{template.source}", nil, erb_trim_mode, '@output_buffer').src
 
diff --git a/actionpack/lib/action_view/template/handlers/rjs.rb b/actionpack/lib/action_view/template/handlers/rjs.rb
index 802a79b3fc..a36744c2b7 100644
--- a/actionpack/lib/action_view/template/handlers/rjs.rb
+++ b/actionpack/lib/action_view/template/handlers/rjs.rb
@@ -3,11 +3,17 @@ module ActionView
     class RJS < TemplateHandler
       include Compilable
 
+      self.default_format = Mime::JS
+
       def compile(template)
         "@formats = [:html];" +
         "controller.response.content_type ||= Mime::JS;" +
           "update_page do |page|;#{template.source}\nend"
       end
+
+      def default_format
+        Mime::JS
+      end
     end
   end
 end