Implementing application-wide 'decorate' view helper

lib/draper/helper_support.rb

@@ -0,0 +1,5 @@
+module Draper::HelperSupport
+  def decorate(input, &block)
+    capture { block.call(input.decorate) }
+  end
+end

spec/draper/helper_support_spec.rb

@@ -0,0 +1,18 @@
+require 'spec_helper'
+
+describe Draper::HelperSupport do
+  before(:each){ @product = Product.new}
+
+  context '#decorate' do
+    it 'renders a block' do
+      output = ApplicationController.decorate(@product){|p| p.model.object_id }
+      output.should == @product.object_id
+    end
+    
+    it 'uses #capture so Rails only renders the content once' do
+      ApplicationController.decorate(@product){|p| p.model.object_id }
+      ApplicationController.capture_triggered.should be
+    end
+  end
+
+end