Implement basic rendering

Woo actioncontroller

lib/active_model/serializer.rb

@@ -19,6 +19,28 @@ module ActiveModel
       end
     end
 
+    if RUBY_VERSION >= '2.0'
+      def self.serializer_for(resource)
+        if resource.respond_to?(:to_ary)
+          ArraySerializer
+        else
+          begin
+            Object.const_get "#{resource.class.name}Serializer"
+          rescue NameError
+            nil
+          end
+        end
+      end
+    else
+      def self.serializer_for(resource)
+        if resource.respond_to?(:to_ary)
+          ArraySerializer
+        else
+          "#{resource.class.name}Serializer".safe_constantize
+        end
+      end
+    end
+
     attr_accessor :object
 
     def initialize(object)

lib/active_model/serializer/adapter/null_adapter.rb

@@ -6,10 +6,10 @@ module ActiveModel
           @serializer = serializer
         end
 
-        def to_json
+        def to_json(options={})
           @serializer.attributes.each_with_object({}) do |(attr, value), h|
             h[attr] = value
-          end.to_json
+          end.to_json # FIXME: why does passing options here cause {}?
         end
       end
     end