From 98d009a000b183039feee17d7cca90572247e8aa Mon Sep 17 00:00:00 2001
From: Benjamin Fleischer <benjamin.fleischer@swipesense.com>
Date: Tue, 11 Aug 2015 17:04:12 -0500
Subject: [PATCH] Let FlattenJson adapter decide it doesn't include meta

---
 lib/active_model/serializer/adapter.rb              | 2 +-
 lib/active_model/serializer/adapter/flatten_json.rb | 7 +++++++
 2 files changed, 8 insertions(+), 1 deletion(-)

diff --git a/lib/active_model/serializer/adapter.rb b/lib/active_model/serializer/adapter.rb
index 7c0614342..0b8118d60 100644
--- a/lib/active_model/serializer/adapter.rb
+++ b/lib/active_model/serializer/adapter.rb
@@ -22,7 +22,7 @@ def serializable_hash(options = nil)
 
       def as_json(options = nil)
         hash = serializable_hash(options)
-        include_meta(hash) unless self.class == FlattenJson
+        include_meta(hash)
         hash
       end
 
diff --git a/lib/active_model/serializer/adapter/flatten_json.rb b/lib/active_model/serializer/adapter/flatten_json.rb
index 87b3ea8c4..7ed570349 100644
--- a/lib/active_model/serializer/adapter/flatten_json.rb
+++ b/lib/active_model/serializer/adapter/flatten_json.rb
@@ -6,6 +6,13 @@ def serializable_hash(options = {})
           super
           @result
         end
+
+        private
+
+        # no-op: FlattenJson adapter does not include meta data, because it does not support root.
+        def include_meta(json)
+          json
+        end
       end
     end
   end