From c389ae220765d66078f9ed5d16d5d91743ba6314 Mon Sep 17 00:00:00 2001
From: Tema Bolshakov <tweekane@gmail.com>
Date: Mon, 18 Aug 2014 12:34:03 +0400
Subject: [PATCH] Support customer array serializer

---
 lib/active_model/serializer.rb                | 12 ++++++++++--
 .../array_serializer/serialization_test.rb    | 19 ++++++++++++++++++-
 2 files changed, 28 insertions(+), 3 deletions(-)

diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index 0d7ae580..b1c5740e 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -58,7 +58,11 @@ end
       if RUBY_VERSION >= '2.0'
         def serializer_for(resource)
           if resource.respond_to?(:to_ary)
-            ArraySerializer
+            if Object.constants.include?(:ArraySerializer)
+              ::ArraySerializer
+            else
+              ArraySerializer
+            end
           else
             begin
               Object.const_get "#{resource.class.name}Serializer"
@@ -70,7 +74,11 @@ end
       else
         def serializer_for(resource)
           if resource.respond_to?(:to_ary)
-            ArraySerializer
+            if Object.constants.include?(:ArraySerializer)
+              ::ArraySerializer
+            else
+              ArraySerializer
+            end
           else
             "#{resource.class.name}Serializer".safe_constantize
           end
diff --git a/test/unit/active_model/array_serializer/serialization_test.rb b/test/unit/active_model/array_serializer/serialization_test.rb
index 3be85131..b1b1e67e 100644
--- a/test/unit/active_model/array_serializer/serialization_test.rb
+++ b/test/unit/active_model/array_serializer/serialization_test.rb
@@ -9,7 +9,7 @@ module ActiveModel
       end
 
       def test_serializer_for_array_returns_appropriate_type
-        assert_kind_of ArraySerializer, @serializer
+        assert_kind_of ActiveModel::ArraySerializer, @serializer
       end
 
       def test_array_serializer_serializes_simple_objects
@@ -18,6 +18,23 @@ module ActiveModel
       end
     end
 
+    class CustomArraySerializerSupport < Minitest::Test
+      def setup
+        Object.const_set(:ArraySerializer, Class.new{ def initialize(*); end })
+
+        array = [1, 2, 3]
+        @serializer = Serializer.serializer_for(array).new(array)
+      end
+
+      def teardown
+        Object.send(:remove_const, :ArraySerializer)
+      end
+
+      def test_serializer_for_array_returns_appropriate_type
+        assert_kind_of ::ArraySerializer, @serializer
+      end
+    end
+
     class ModelSerializationTest < Minitest::Test
       def test_array_serializer_serializes_models
         array = [Profile.new({ name: 'Name 1', description: 'Description 1', comments: 'Comments 1' }),