Breadcrumb links rewrite feature

features/breadcrumb.feature

@@ -0,0 +1,27 @@
+Feature: Breadcrumb
+
+  Background:
+    Given I am logged in
+
+  Scenario: Default breadcrumb links
+    Given a configuration of:
+    """
+      ActiveAdmin.register Post do
+      end
+    """
+    When I am on the new post page
+    Then I should see a link to "Post" in the breadcrumb
+
+  Scenario: Rewritten breadcrumb links
+    Given a configuration of:
+    """
+      ActiveAdmin.register Post do
+        breadcrumb do
+          [
+            link_to('test', '/admin/test/url')
+          ]
+        end
+      end
+    """
+    When I am on the new post page
+    Then I should see a link to "test" in the breadcrumb

lib/active_admin/dsl.rb

@@ -120,6 +120,24 @@ def batch_action(title, options = {}, &block)
     def menu(options = {})
       config.menu(options)
     end
+
+    # Rewrite breadcrumb links.
+    # Block will be executed inside controller.
+    # Block must return an array if you want to rewrite breadcrumb links.
+    #
+    # Example:
+    #   ActiveAdmin.register Post do
+    #
+    #     breadcrumb do
+    #       [
+    #         link_to 'my piece', '/my/link/to/piece'
+    #       ]
+    #     end
+    #   end
+    #
+    def breadcrumb(&block)
+      config.breadcrumb = block
+    end
 
     def sidebar(name, options = {}, &block)
       config.sidebar_sections << ActiveAdmin::SidebarSection.new(name, options, &block)

lib/active_admin/page.rb

@@ -17,6 +17,9 @@ class Page
 
     # An array of custom actions defined for this page
     attr_reader :page_actions
+
+    # Set breadcrumb builder
+    attr_accessor :breadcrumb
 
     module Base
       def initialize(namespace, name, options)

lib/active_admin/resource.rb

@@ -46,6 +46,9 @@ class Resource
 
     # Set the configuration for the CSV
     attr_writer :csv_builder
+
+    # Set breadcrumb builder
+    attr_accessor :breadcrumb
 
     # Store a reference to the DSL so that we can dereference it during garbage collection.
     attr_accessor :dsl

lib/active_admin/view_helpers/breadcrumb_helper.rb

@@ -19,7 +19,7 @@ def breadcrumb_links(path = nil)
               # ignored
             end
           end
-          
+
           name ||= I18n.t("activerecord.models.#{part.singularize}", :count => 1.1, :default => part.titlecase)
 
           crumbs << link_to( name, "/" + parts[0..index].join('/'))

lib/active_admin/views/title_bar.rb

@@ -6,7 +6,6 @@ def build(title, action_items)
         super(:id => "title_bar")
         @title = title
         @action_items = action_items
-
         build_titlebar_left
         build_titlebar_right
       end
@@ -27,8 +26,12 @@ def build_titlebar_right
       end
 
       def build_breadcrumb(separator = "/")
-        links = breadcrumb_links
-        return if links.empty?
+        links = if active_admin_config && active_admin_config.breadcrumb.present?
+          instance_exec(controller, &active_admin_config.breadcrumb)
+        else
+          breadcrumb_links
+        end
+        return unless links.present? && links.is_a?(::Array)
         span :class => "breadcrumb" do
           links.each do |link|
             text_node link

spec/unit/views/pages/layout_spec.rb

@@ -7,7 +7,7 @@
     helpers = mock_action_view
 
     helpers.stub :active_admin_application => active_admin_application,
-                 :active_admin_config => mock('Config', :action_items? => nil, :sidebar_sections? => nil),
+                 :active_admin_config => mock('Config', :action_items? => nil, :breadcrumb => nil, :sidebar_sections? => nil),
                  :active_admin_namespace => active_admin_namespace,
                  :breadcrumb_links => [],
                  :content_for => "",