ActiveModel::Errors json serialization to work as Rails 3b4 [#5254 state:resolved]

Signed-off-by: José Valim <jose.valim@gmail.com>

activemodel/lib/active_model/errors.rb

@@ -169,9 +169,9 @@ module ActiveModel
       to_a.to_xml options.reverse_merge(:root => "errors", :skip_types => true)
     end
 
-    # Returns an array as JSON representation for this object.
+    # Returns an ActiveSupport::OrderedHash that can be used as the JSON representation for this object.
     def as_json(options=nil)
-      to_a
+      self 
     end
 
     # Adds +message+ to the error messages on +attribute+, which will be returned on a call to

activemodel/test/cases/serializeration/json_serialization_test.rb

@@ -89,7 +89,7 @@ class JsonSerializationTest < ActiveModel::TestCase
     assert_match %r{"preferences":\{"shows":"anime"\}}, json
   end
 
-  test "methds are called on object" do
+  test "methods are called on object" do
     # Define methods on fixture.
     def @contact.label; "Has cheezburger"; end
     def @contact.favorite_quote; "Constraints are liberating"; end
@@ -102,4 +102,18 @@ class JsonSerializationTest < ActiveModel::TestCase
     assert_match %r{"label":"Has cheezburger"}, methods_json
     assert_match %r{"favorite_quote":"Constraints are liberating"}, methods_json
   end
+
+  test "should return OrderedHash for errors" do
+    car = Automobile.new
+    
+    # run the validation
+    car.valid? 
+    
+    hash = ActiveSupport::OrderedHash.new
+    hash[:make]  = "can't be blank"
+    hash[:model] = "is too short (minimum is 2 characters)"
+    assert_equal hash.to_json, car.errors.to_json
+  end
+  
+  
 end

activemodel/test/cases/validations_test.rb

@@ -170,9 +170,11 @@ class ValidationsTest < ActiveModel::TestCase
     assert_match %r{<errors>}, xml
     assert_match %r{<error>Title can't be blank</error>}, xml
     assert_match %r{<error>Content can't be blank</error>}, xml
-
-    json = t.errors.to_json
-    assert_equal t.errors.to_a.to_json, json
+    
+    hash = ActiveSupport::OrderedHash.new
+    hash[:title] = "can't be blank"
+    hash[:content] = "can't be blank"
+    assert_equal t.errors.to_json, hash.to_json
   end
 
   def test_validation_order