controller.rb

respond_to :html, :rss

  def index
    @news_items = NewsItem.published.paginate(:page => params[:page], :per_page => NewsItem.per_page)
    respond_with @news_items do |format|
      format.html
      format.rss { render :layout => false }
    end
  end

index.rss.builder

xml.instruct! :xml, :version => "1.0"
xml.rss :version => "2.0" do
  xml.channel do
    xml.title RefinerySetting.find_or_set(:site_name, "Neoteric Design")
    xml.description RefinerySetting.find_or_set(:site_name, "Neoteric Design") + " News"
    xml.link news_items_url

    @news_items.each do |post|
      xml.item do
        xml.title post.title
        xml.description post.body
        xml.pubDate post.publish_date.to_s(:rfc822)
        xml.link news_item_url(post)
      end
    end
  end
end

results.txt

NoMethodError in News_items#index.rss

Showing /Users/.../views/news_items/index.rss.builder where line #8 raised:

You have a nil object when you didn't expect it!
You might have expected an instance of Array.
The error occurred while evaluating nil.each
Extracted source (around line #8):

6:     xml.link news_items_url
7: 
8:     @news_items.each do |post|
9:       xml.item do
10:         xml.title post.title
11:         xml.description post.body