From e321cb366d094a665a97692f2198fc9f7be1a3f8 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jo=C3=A3o=20Moura?= <joaomdmoura@gmail.com>
Date: Tue, 16 Jun 2015 06:23:02 -0300
Subject: [PATCH] Getting root key from AR::Relation

---
 lib/active_model/serializer/array_serializer.rb | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/lib/active_model/serializer/array_serializer.rb b/lib/active_model/serializer/array_serializer.rb
index 71c7ab44..174e16fc 100644
--- a/lib/active_model/serializer/array_serializer.rb
+++ b/lib/active_model/serializer/array_serializer.rb
@@ -7,7 +7,8 @@ module ActiveModel
       attr_reader :meta, :meta_key
 
       def initialize(objects, options = {})
-        @objects = objects.map do |object|
+        @resource = objects
+        @objects  = objects.map do |object|
           serializer_class = options.fetch(
             :serializer,
             ActiveModel::Serializer.serializer_for(object)
@@ -19,7 +20,11 @@ module ActiveModel
       end
 
       def json_key
-        @objects.first.json_key.pluralize if @objects.first
+        if @objects.first
+          @objects.first.json_key.pluralize
+        else
+          @resource.name.downcase.pluralize if @resource.try(:name)
+        end
       end
 
       def root=(root)