Monkey patch to handle regression in ERB::Util#html_escape in rails 3.0.17 / ruby 1.9

gistfile1.rb

class ERB
  module Util
    # see https://github.com/rails/rails/issues/7430 for details
    #
    # A utility method for escaping HTML tag characters.                                                                                                                                                                                                       
    # This method is also aliased as <tt>h</tt>.                                                                                                                                                                                                               
    #                                                                                                                                                                                                                                                          
    # In your ERB templates, use this method to escape any unsafe content. For example:                                                                                                                                                                        
    #   <%=h @person.name %>                                                                                                                                                                                                                                   
    #                                                                                                                                                                                                                                                          
    # ==== Example:                                                                                                                                                                                                                                            
    #   puts html_escape("is a > 0 & a < 10?")                                                                                                                                                                                                                 
    #   # => is a &gt; 0 &amp; a &lt; 10?                                                                                                                                                                                                                      
    def html_escape(s)                                                                                                                                                                                                                                         
      s = s.to_s                                                                                                                                                                                                                                               
      if s.html_safe?                                                                                                                                                                                                                                          
        s                                                                                                                                                                                                                                                      
      else                                                                                                                                                                                                                                                     
        s.gsub(/[&"'><]/, HTML_ESCAPE).html_safe                                                                                                                                                                                                               
      end                                                                                                                                                                                                                                                      
    end

    alias h html_escape

    singleton_class.send(:remove_method, :html_escape)
    module_function :html_escape, :h
  end
end

Thanks you very much!