add type option to atom feed entry builder

closes #5672

actionpack/lib/action_view/helpers/atom_feed_helper.rb

@@ -176,6 +176,7 @@ module ActionView
         # * <tt>:updated</tt>: Time of update. Defaults to the updated_at attribute on the record if one such exists.
         # * <tt>:url</tt>: The URL for this entry. Defaults to the polymorphic_url for the record.
         # * <tt>:id</tt>: The ID for this entry. Defaults to "tag:#{@view.request.host},#{@feed_options[:schema_date]}:#{record.class}/#{record.id}"
+        # * <tt>:type</tt>: The TYPE for this entry. Defaults to "text/html".
         def entry(record, options = {})
           @xml.entry do
             @xml.id(options[:id] || "tag:#{@view.request.host},#{@feed_options[:schema_date]}:#{record.class}/#{record.id}")
@@ -188,7 +189,9 @@ module ActionView
               @xml.updated((options[:updated] || record.updated_at).xmlschema)
             end
 
-            @xml.link(:rel => 'alternate', :type => 'text/html', :href => options[:url] || @view.polymorphic_url(record))
+            type = options.fetch(:type) { 'text/html' }
+
+            @xml.link(:rel => 'alternate', :type => type, :href => options[:url] || @view.polymorphic_url(record))
 
             yield AtomBuilder.new(@xml)
           end

actionpack/test/template/atom_feed_helper_test.rb

@@ -45,6 +45,23 @@ class ScrollsController < ActionController::Base
           end
         end
     EOT
+    FEEDS["entry_type_options"] = <<-EOT
+        atom_feed(:schema_date => '2008') do |feed|
+          feed.title("My great blog!")
+          feed.updated((@scrolls.first.created_at))
+
+          @scrolls.each do |scroll|
+            feed.entry(scroll, :type => 'text/xml') do |entry|
+              entry.title(scroll.title)
+              entry.content(scroll.body, :type => 'html')
+
+              entry.author do |author|
+                author.name("DHH")
+              end
+            end
+          end
+        end
+    EOT
     FEEDS["xml_block"] = <<-EOT
         atom_feed do |feed|
           feed.title("My great blog!")
@@ -306,6 +323,20 @@ class AtomFeedTest < ActionController::TestCase
     end
   end
 
+  def test_feed_entry_type_option_default_to_text_html
+    with_restful_routing(:scrolls) do
+      get :index, :id => 'defaults'
+      assert_select "entry link[rel=alternate][type=text/html]"
+    end
+  end
+
+  def test_feed_entry_type_option_specified
+    with_restful_routing(:scrolls) do
+      get :index, :id => 'entry_type_options'
+      assert_select "entry link[rel=alternate][type=text/xml]"
+    end
+  end
+
   private
     def with_restful_routing(resources)
       with_routing do |set|