Custom Breadcrumb Builder that handles a render action from the controller using breadcrumbs_on_rails. Instead of highlighting the "middle" item as active, e.g. Home >> **Widgets** >> New, the last item will be highlighted instead (so New in the previous

application.html.haml

// Usage
= render_breadcrumbs :builder => BreadcrumbBuilder

breadcrumb_builder.rb

class BreadcrumbBuilder < BreadcrumbsOnRails::Breadcrumbs::Builder

  def render
    @elements.collect do |element|
      render_element(element)
    end.join(@options[:separator] || " &raquo; ")
  end

  def render_element(element)
    # Force the last breadcrumb to be the active one if the request is a post or a put
    if @context.request.post? || @context.request.put?
      content = (@elements.last == element) ? element.name : @context.link_to(compute_name(element), compute_path(element))
    else
      content = @context.link_to_unless_current(compute_name(element), compute_path(element))      
    end

    if @options[:tag]
      @context.content_tag(@options[:tag], content)
    else
      content
    end
  end
end

widget_controller.rb

# The controller code

def new
  add_breadcrumb 'New', new_widget_path
end

def create
  @widget = Widget.new(params[:widget])
  if @widget.save
    redirect_to @widget, notice: 'Widget was successfully created.'
  else
    add_breadcrumb 'New', new_widget_path
    render 'new'
  end
end