1 files changed, 12 insertions, 8 deletions
diff --git a/actionpack/lib/action_controller/metal/rendering.rb b/actionpack/lib/action_controller/metal/rendering.rb
index abcc9d4acf..5c48b4ab98 100644
--- a/actionpack/lib/action_controller/metal/rendering.rb
+++ b/actionpack/lib/action_controller/metal/rendering.rb
@@ -12,27 +12,31 @@ module ActionController
     def render(*args) #:nodoc:
       raise ::AbstractController::DoubleRenderError if self.response_body
       super
-      self.content_type ||= rendered_format.to_s
-      self.response_body
     end
 
     # Overwrite render_to_string because body can now be set to a rack body.
     def render_to_string(*)
-      if self.response_body = super
+      result = super
+      if result.respond_to?(:each)
         string = ""
-        self.response_body.each { |r| string << r }
+        result.each { |r| string << r }
         string
+      else
+        result
       end
-    ensure
-      self.response_body = nil
     end
 
-    def render_to_body(*)
-      super || " "
+    def render_to_body(options = {})
+      super || options[:text].presence || ' '
     end
 
     private
 
+    def _process_format(format)
+      super
+      self.content_type ||= format.to_s
+    end
+
     # Normalize arguments by catching blocks and setting them on :update.
     def _normalize_args(action=nil, options={}, &blk) #:nodoc:
       options = super