2 files changed, 8 insertions, 4 deletions
diff --git a/actionpack/lib/action_controller/metal.rb b/actionpack/lib/action_controller/metal.rb
index 3aab77a069..92433ab462 100644
--- a/actionpack/lib/action_controller/metal.rb
+++ b/actionpack/lib/action_controller/metal.rb
@@ -181,9 +181,13 @@ module ActionController
       @_status = Rack::Utils.status_code(status)
     end
 
-    def response_body=(val)
-      body = (val.nil? || val.respond_to?(:each)) ? val : [val]
-      super body
+    def response_body=(body)
+      body = [body] unless body.nil? || body.respond_to?(:each)
+      super
+    end
+
+    def performed?
+      !!response_body
     end
 
     def dispatch(name, request) #:nodoc:
diff --git a/actionpack/lib/action_controller/metal/implicit_render.rb b/actionpack/lib/action_controller/metal/implicit_render.rb
index e8e465d3ba..ae04b53825 100644
--- a/actionpack/lib/action_controller/metal/implicit_render.rb
+++ b/actionpack/lib/action_controller/metal/implicit_render.rb
@@ -2,7 +2,7 @@ module ActionController
   module ImplicitRender
     def send_action(method, *args)
       ret = super
-      default_render unless response_body
+      default_render unless performed?
       ret
     end