Fixing `as_json` method for ActiveRecord models.

When you've got an AR Model and you override the `as_json` method,
you should be able to add default options to the renderer, like this:

    class User < ActiveRecord::Base
      def as_json(options = {})
        super(options.merge(:except => [:password_digest]))
      end
    end

This was not possible before this commit. See the added test case.

1 files changed, 1 insertions, 1 deletions

diff --git a/activesupport/lib/active_support/core_ext/object/to_json.rb b/activesupport/lib/active_support/core_ext/object/to_json.rb
index 14ef27340e..82e232070d 100644
--- a/activesupport/lib/active_support/core_ext/object/to_json.rb
+++ b/activesupport/lib/active_support/core_ext/object/to_json.rb
@@ -12,7 +12,7 @@ end
 [Object, Array, FalseClass, Float, Hash, Integer, NilClass, String, TrueClass].each do |klass|
   klass.class_eval <<-RUBY, __FILE__, __LINE__
     # Dumps object in JSON (JavaScript Object Notation). See www.json.org for more info.
-    def to_json(options = nil)
+    def to_json(options = {})
       ActiveSupport::JSON.encode(self, options)
     end
   RUBY