diff --git a/activesupport/lib/active_support/json/encoding.rb b/activesupport/lib/active_support/json/encoding.rb
index 8ba45f7..47df7ff 100644
--- a/activesupport/lib/active_support/json/encoding.rb
+++ b/activesupport/lib/active_support/json/encoding.rb
@@ -177,7 +177,11 @@ end
 
 class Array
   def as_json(options = nil) self end #:nodoc:
-  def encode_json(encoder) "[#{map { |v| encoder.encode(v) } * ','}]" end #:nodoc:
+  def encode_json(encoder) 
+    collection_root = encoder.options[:collection_root] rescue nil
+    results = "[#{map { |v| encoder.encode(v) } * ','}]" 
+    collection_root.nil? ? results : "{\"#{collection_root}\" : #{results}}"
+  end #:nodoc:
 end
 
 class Hash
diff --git a/activesupport/test/json/encoding_test.rb b/activesupport/test/json/encoding_test.rb
index cf9a635..6bba26d 100644
--- a/activesupport/test/json/encoding_test.rb
+++ b/activesupport/test/json/encoding_test.rb
@@ -115,6 +115,10 @@ class TestJSONEncoding < Test::Unit::TestCase
     ActiveSupport.use_standard_json_time_format = false
   end
 
+  def test_enumerable_to_json_allows_collection_root
+    assert_equal %({\"myCollection\" : [{\"a\":1},{\"a\":2}]}), ActiveSupport::JSON.encode([{:a => 1}, {:a => 2}], :collection_root => "myCollection")
+  end
+
   def test_nested_hash_with_float
     assert_nothing_raised do
       hash = {