Add application config option to remove breadcrumb

features/breadcrumb.feature

@@ -25,3 +25,14 @@ Feature: Breadcrumb
     """
     When I am on the new post page
     Then I should see a link to "test" in the breadcrumb
+
+  Scenario: No Breadcrumbs configuration
+    Given a configuration of:
+    """
+      ActiveAdmin.application.breadcrumb = false
+      ActiveAdmin.register Post do
+      end
+    """
+    When I am on the new post page
+    Then I should see "Post"
+    And I should not see the element ".breadcrumb"

lib/active_admin/application.rb

@@ -67,6 +67,9 @@ def initialize
     # The namespace root.
     inheritable_setting :root_to, 'dashboard#index'
 
+    # Display breadcrumbs
+    inheritable_setting :breadcrumb, true
+
     # Default CSV options
     inheritable_setting :csv_options, {:col_sep => ','}
 

lib/active_admin/views/title_bar.rb

@@ -26,6 +26,8 @@ def build_titlebar_right
       end
 
       def build_breadcrumb(separator = "/")
+        return unless active_admin_namespace.breadcrumb
+
         links = if active_admin_config && active_admin_config.breadcrumb.present?
           instance_exec(controller, &active_admin_config.breadcrumb)
         else

lib/generators/active_admin/install/templates/active_admin.rb.erb

@@ -147,6 +147,14 @@ ActiveAdmin.setup do |config|
   # config.favicon = '/assets/favicon.ico'
 
 
+  # == Removing Breadcrumbs
+  #
+  # Breadcrumbs are enabled by default. You can customize them for individual
+  # resources or you can disable them globally from here.
+  #
+  # config.breadcrumb = false
+
+
   # == Register Stylesheets & Javascripts
   #
   # We recommend using the built in Active Admin layout and loading