canvas-lms/gems/canvas_crummy

h1. CanvasCrummy

This is a fork of an early version of the crummy gem. http://rubygems.org/gems/crummy

TODO: use a more current version of the gem instead of this forked one

h2. Introduction

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

h2. Install

The gem is hosted on gemcutter, so if you haven’t already, add it as a gem source:

  
    gem sources -a http://gemcutter.org/
  

Then install the Formtastic gem:

  
    gem install crummy
  

You can also install it as a Rails plugin:

  
    script/plugin install git://github.com/zachinglis/crummy.git
  

h2. 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"
  
      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 %>
  

h2. Options for render_crumb_

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. Defaults to :html

:format => (:html|:xml)

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

:seperator => string

Render links in the output. Defaults to +true+

:link => boolean

h3. Examples

 
  render_crumbs                     #=> Home » Businesses
  render_crumbs :seperator => ' | ' #=> Home | Businesses
  render_crumbs :format => :xml     #=> HomeBusinesses
 

A crumb with a nil link will just output plain text.

h2. Notes

The variable set is set to @_crumbs as to not conflict with your code.

h2. Todo

• Port over rspecs from project to plugin (Fully tested in a project)
• 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)

h2. Credits

• "Zach Inglis":http://zachinglis.com
• "Rein Henrichs":http://reinh.com
• "Les Hill":http://blog.leshill.org/
• "Sandro Turriate":http://turriate.com/
• "Przemysław Kowalczyk":http://szeryf.wordpress.com/2008/06/13/easy-and-flexible-breadcrumbs-for-rails/ - feature ideas