tmarkiewicz · December 22, 2009 19:08
diff --git a/application.html.erb b/application.html.erb
 You are here:
 <%= trail.to_html(response) %>
diff --git a/application_controller.rb b/application_controller.rb
 class ApplicationController < ActionController::Base
  before_filter :trail

  def self.trail(&block)
    # Controller-level trails become filters so they run inside the
    # request/response cycle, where internationalization etc works.
    # instance_exec means you can use path helpers.
    before_filter {|controller| controller.instance_exec(controller.send(:trail), &block) }
  end

  trail {|t| t << ['Home', '/'] }

 protected

  def trail
    @breadcrumb_trail ||= BreadcrumbTrail.new
  end
  helper_method :trail

  class BreadcrumbTrail
    def initialize
      @crumbs = []
    end

    def <<(crumb)
      @crumbs << crumb
    end

    def append(crumbs)
      @crumbs += crumbs
    end

    def to_html(response)
      template = response.template
      @crumbs.map { |crumb|
        text, url = Array(crumb)
        last_crumb = @crumbs.last
        template.instance_eval {
          link_to_unless((crumb == last_crumb || url.blank?), h(text), url) {|text| content_tag(:span, text) }
        }
      }.join(" &gt; ")
    end
  end

 end
diff --git a/items_controller.rb b/items_controller.rb
 class ItemsController < ApplicationController

  trail {|t| t << ['Items', '/items'] }

  def show
    trail << ['Specific item from controller', '/items/123']
  end

 end
diff --git a/show.html.erb b/show.html.erb
 <%
  trail << ['Specific item from view', '/items/123']
  # Note that since layouts are rendered after their child template,
  # trails appended in a layout will currently come after those
  # appended in the child templates.
 %>
	class ApplicationController < ActionController::Base
	before_filter :trail

	def self.trail(&block)
	# Controller-level trails become filters so they run inside the
	# request/response cycle, where internationalization etc works.
	# instance_exec means you can use path helpers.
	before_filter {\|controller\| controller.instance_exec(controller.send(:trail), &block) }
	end

	trail {\|t\| t << ['Home', '/'] }

	protected

	def trail
	@breadcrumb_trail \|\|= BreadcrumbTrail.new
	end
	helper_method :trail

	class BreadcrumbTrail
	def initialize
	@crumbs = []
	end

	def <<(crumb)
	@crumbs << crumb
	end

	def append(crumbs)
	@crumbs += crumbs
	end

	def to_html(response)
	template = response.template
	@crumbs.map { \|crumb\|
	text, url = Array(crumb)
	last_crumb = @crumbs.last
	template.instance_eval {
	link_to_unless((crumb == last_crumb \|\| url.blank?), h(text), url) {\|text\| content_tag(:span, text) }
	}
	}.join(" > ")
	end
	end

	end
	class ItemsController < ApplicationController

	trail {\|t\| t << ['Items', '/items'] }

	def show
	trail << ['Specific item from controller', '/items/123']
	end

	end
	<%
	trail << ['Specific item from view', '/items/123']
	# Note that since layouts are rendered after their child template,
	# trails appended in a layout will currently come after those
	# appended in the child templates.
	%>