Rob On Rails

Just a quick post, I’ve been tweaking my breadcrumbs mixin, and I think I’ve got it as good as it’s gonna get (hah!)..

I’ll just give you guys the code:

module BreadcrumbHelper

  def self.included receiver
    receiver.extend ClassMethods
  end

  module ClassMethods    
    def breadcrumb name, options = {}
      before_filter options do |controller|
        controller.send(:breadcrumb, name, options)
      end
    end
  end

  def breadcrumb name, options = {}
    @breadcrumbs ||= []    
    @breadcrumbs << { :name => name, :options => options }
  end
  
  def breadcrumbs delimeter = " / "
     links = []
     @breadcrumbs.each do |breadcrumb|
       name = format_name(breadcrumb)
       unless breadcrumb == @breadcrumbs.last
         if breadcrumb[:options][:url]
           url = breadcrumb[:options][:url]
         else
           url = "#{name.downcase}_path" # for the lazy
         end
         url = eval(url) if url =~ /^@|([a-z0-9]+(_path|_url)(\([^ ]+\))*)$/i
       end
       links << @template.link_to_if(url, @template.html_escape(name), url)
     end
     links.join("#{delimeter}")
   end
   
   def format_name breadcrumb
     if breadcrumb[:options][:eval] and  breadcrumb[:options][:eval] == true
       eval("\"#{breadcrumb[:name]}\"")
     elsif breadcrumb[:name].class == Symbol
       breadcrumb[:name].to_s.capitalize 
     else
       breadcrumb[:name]
     end
   end
   
   def breadcrumbs_title delimiter = " / ", max_length = 2
     titles = []
     @breadcrumbs[@breadcrumbs.length-max_length..-1].each do |breadcrumb|
       titles << @template.html_escape(format_name(breadcrumb))
     end
     titles.join(delimiter)
   end
   
end

Usage is similar to before, but without the need for :link => [boolean].

eval(not-evil)-d urls work better than before, and accept params now!

You can also eval the title, by using :eval => true when you define the breadcrumb.

breadcrumb 'Order: #{@purchase.id_token}', :eval => true, :except => [:new, :create]

The titles helper now accepts two params: delimiter & max_crumbs. This means you can pick and delimit breadcrumbs from the end of the trail to form your title.

Enjoy :)