From 967ff8dcc0b125105991b34498bf8950846bb350 Mon Sep 17 00:00:00 2001
From: Darren Cheng <darren@thanx.com>
Date: Mon, 28 Aug 2017 19:38:06 -0700
Subject: [PATCH] Patch Enumerator.new ArgumentError.

---
 lib/active_model/serializer.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 9d00e6fb..6f7620a2 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -337,7 +337,7 @@ module ActiveModel
     # @return [Enumerator<Association>]
     def associations(include_directive = ActiveModelSerializers.default_include_directive, include_slice = nil)
       include_slice ||= include_directive
-      return Enumerator.new unless object
+      return Enumerator.new { } unless object
 
       Enumerator.new do |y|
         self.class._reflections.each do |key, reflection|