added support to decorate a ActiveRecord collection

ActiveRecordCollection.decorate returns a DecoratorEnumerableProxy

lib/draper/model_support.rb

@@ -3,4 +3,15 @@ module Draper::ModelSupport
     @decorator ||= "#{self.class.name}Decorator".constantize.decorate(self)
     block_given? ? yield(@decorator) : @decorator
   end
+
+  module ClassMethods
+    def decorate(context = {})
+      @decorator_proxy ||= "#{model_name}Decorator".constantize.decorate(self.scoped)
+      block_given? ? yield(@decorator_proxy) : @decorator_proxy
+    end
+  end
+
+  def self.included(base)
+    base.extend(ClassMethods)
+  end
 end

spec/draper/model_support_spec.rb

@@ -12,4 +12,16 @@ describe Draper::ModelSupport do
       a.should eql "Awesome Title"
     end
   end
+
+  describe '#decorate - decorate collections of AR objects' do
+    subject { Product.limit }
+    its(:decorate) { should be_kind_of(Draper::DecoratedEnumerableProxy) }
+
+    it "should decorate the collection" do
+      subject.decorate.size.should == 1
+      subject.decorate.to_ary[0].model.should be_a(Product)
+    end
+
+
+  end
 end

spec/samples/active_record.rb

@@ -1,4 +1,9 @@
 module ActiveRecord
   class Base
+
+    def self.limit
+      self
+    end
+
   end
 end

spec/samples/product.rb

@@ -1,4 +1,14 @@
 class Product < ActiveRecord::Base
+  include Draper::ModelSupport
+
+  def self.scoped
+    [Product.new]
+  end
+
+  def self.model_name
+    "Product"
+  end
+
   def self.find(id)
     return Product.new
   end
@@ -22,4 +32,4 @@ class Product < ActiveRecord::Base
   def block
     yield
   end
-end
+end