jumpstart/config/initializers/bootstrap_breadcrumbs_builder.rb

class BootstrapBreadcrumbsBuilder < BreadcrumbsOnRails::Breadcrumbs::Builder
  def render
    if @elements.size > 0
      set_context
    else
      set_element
    end
  end

  def set_context
    @context.content_tag(:ol, class: 'breadcrumb') do
      @elements.collect do |element|
        render_element(element)
      end.join.html_safe
    end
  end

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

  def render_element(element)
    current = @context.current_page?(compute_path(element))

    @context.content_tag(:li, class: "breadcrumb-item #{'active' if current}") do
      link_or_text = @context.link_to_unless_current(compute_name(element),
                                                     compute_path(element),
                                                     element.options)
      link_or_text
    end
  end
end