html_tags.rb

# Causes Rails to output HTML instead of XHTML.
# Example: <%= image_tag "bacon.png" %>
# Before: <img src="/images/bacon.png" />
# After: <img src="/images/bacon.png">

module ActionView::Helpers::TagHelper
  # Force the 'open' argument to always be true.
  old_tag = instance_method(:tag)
  define_method :tag do |name, options = nil, open = true, escape = true|
    old_tag.bind(self).call(name, options, true, escape)
  end
end

module ActionView::Helpers::CsrfHelper
  # csrf_meta_tag, unlike the other helpers, does not use 'tag' internally.
  # Hence, it needs to be manually modified here.
  def csrf_meta_tag
    if protect_against_forgery?
      csrf = tag("meta", {:name => "csrf-param", :content => "#{Rack::Utils.escape_html(request_forgery_protection_token)}"})
      csrf << "\n"
      csrf << tag("meta", {:name => "csrf-token", :content => "#{Rack::Utils.escape_html(form_authenticity_token)}"})
      csrf.html_safe
    end
  end
end