Crummy

Introduction

Crummy is a simple and tasty way to add breadcrumbs to your Rails applications.

Install

Simply add the dependency to your Gemfile:

  
    gem "crummy", "~> 1.6.0"

Example

In your controllers you may add_crumb either like a before_filter or within a method (It is also available to views).

  
    class ApplicationController
      add_crumb "Home", '/'
    end

    class BusinessController < ApplicationController
      add_crumb("Businesses") { |instance| instance.send :businesses_path }
      add_crumb("Comments", :only => "comments") { |instance| instance.send :businesses_comments_path }
      before_filter :load_comment, :only => "show"
      add_crumb :comment, :only => "show"

      # Example for nested routes:
      add_crumb(:document) { [:account, :document] }

      def show
        add_crumb @business.display_name, @business
      end

      def load_comment
        @comment = Comment.find(params[:id])
      end
    end

Then in your view:

  
    <%= render_crumbs %>

Options for render_crumbs

render_crumbs renders the list of crumbs as either html or xml

It takes 3 options

The output format. Can either be :xml or :html or :html_list. Defaults to :html

:format => (:html|:html_list|:xml)

The separator text. It does not assume you want spaces on either side so you must specify. Defaults to » for :html and <crumb> for :xml

:separator => string

Render links in the output. Defaults to true

:links => boolean

:skip_if_blank => true

With this option, output will be blank if there are no breadcrumbs.

Examples

 
  render_crumbs                        #=> <a href="/">Home</a> &raquo; <a href="/businesses">Businesses</a>
  render_crumbs :separator => ' | '    #=> <a href="/">Home</a> | <a href="/businesses">Businesses</a>
  render_crumbs :format => :xml        #=> <crumb href="/">Home</crumb><crumb href="/businesses">Businesses</crumb>
  render_crumbs :format => :html_list  #=> <ul class="" id=""><li class=""><a href="/">Home</a></li><li class=""><a href="/">Businesses</a></li></ul>

A crumb with a nil argument for the link will output an unlinked crumb.

With :format => :html_list you can specify additional params: :active_li_class, :li_class, :ul_class, :ul_id

App-wide configuration

You have the option to pre-configure any of the Crummy options in an application-wide configuration. The options above are available to configure, with the exception of :separator, as well as many others.

The biggest difference is that :separator is not an option. Instead, you have format-specific configuration options: :html_separator, :xml_separator, and :html_list_separator. :separator can still be overridden in the view.

Insert the following in a file named config/initializers/crummy.rb:

  
    Crummy.configure do |config|
      config.format = :xml
    end

Possible parameters for configuration are:

  
    :format
    :links
    :skip_if_blank
    :html_separator
    :xml_separator
    :html_list_separator
    :first_class
    :last_class
    :ul_id
    :ul_class
    :li_class
    :active_li_class

See lib/crummy.rb for a list of these parameters and their defaults.

Notes

Test library is at Crummy Test

Todo

Accept collections of models as a single argument
Accept instances of models as a single argument
Allow for variables in names. (The workaround is to do your own before_filter for that currently)
Make a crumbs? type method

libkazz/crummy