t2

ActionView::Base.field_error_proc = Proc.new do |html_tag, instance|
 html = %(<div class="field_with_errors">#{html_tag}</div>).html_safe
 # add nokogiri gem to Gemfile
 elements = Nokogiri::HTML::DocumentFragment.parse(html_tag).css "label, input"
 elements.each do |e|
   if e.node_name.eql? 'label'
     html = %(<div class="clearfix error">#{e}</div>).html_safe
   elsif e.node_name.eql? 'input'
     if instance.error_message.kind_of?(Array)
       html = %(<div class="clearfix error">#{html_tag}<span class="help-inline">&nbsp;#{instance.error_message.join(',')}</span></div>).html_safe

t2

def destroy
  Part.find(params[:id]).destroy
  flash[:success] = "Part removed."
  respond_to do |format|
    format.html { redirect_to root_url }
    format.js { redirect_to root_url }
  end
end

t2

$ rails console
#Loading development environment (Rails 3.1.0.rc4)
> a = Time.now            # => 2011-07-26 01:37:59 -0500 
> b = Time.parse(a.to_s)  # => 2011-07-26 01:37:59 -0500 
> a == b                  # => false 
> c = a - b               # => 0.653716

t2

"a1 a2 a1".reverse.sub("a1".reverse, "a3".reverse).reverse