allow #body_class to take an optional argument of a symbol which it w…

…ill use #content_for on to add more body classes, defaults to :extra_body_classes

app/helpers/body_class_helper.rb

@@ -1,6 +1,13 @@
 module BodyClassHelper
-  def body_class
+  def body_class(options = {})
+    extra_body_classes_symbol = options[:extra_body_classes_symbol] || :extra_body_classes
     qualified_controller_name = controller.controller_path.gsub('/','-')
-    "#{qualified_controller_name} #{qualified_controller_name}-#{controller.action_name}"
+    basic_body_class = "#{qualified_controller_name} #{qualified_controller_name}-#{controller.action_name}"
+
+    if content_for?(extra_body_classes_symbol)
+      [basic_body_class, content_for(extra_body_classes_symbol)].join(' ')
+    else
+      basic_body_class
+    end
   end
 end

spec/helpers/body_class_helper_spec.rb

@@ -1,6 +1,6 @@
 require 'spec_helper'
 
-describe BodyClassHelper do
+describe BodyClassHelper, 'without any extra body classes' do
   describe "body_class with a normal controller" do
     before do
       controller = mock
@@ -24,3 +24,16 @@
     end
   end
 end
+
+describe BodyClassHelper, 'with extra body classes' do
+  before do
+    controller = mock
+    controller.stubs(:controller_path).returns('widgets')
+    controller.stubs(:action_name).returns('show')
+    helper.stubs(:controller).returns controller
+    helper.content_for(:extra_body_classes, 'extra_class')
+  end
+  it "adds extra body classes to the controller classes" do
+    helper.body_class.should == 'widgets widgets-show extra_class'
+  end
+end