From d8b78a36cfde1bef6dc23c6a64f6b92c4597258d Mon Sep 17 00:00:00 2001
From: Jacek Tomaszewski <kontakt@jtomaszewski.eu>
Date: Wed, 19 Feb 2014 15:48:52 +0100
Subject: [PATCH] Allow to define custom serializer for given class

.. by defining #serializer_class method in serialized object's class. Resolves #515.
---
 lib/active_model/serializer.rb                  |  4 +++-
 .../array_serializer/serialization_test.rb      | 17 +++++++++++++++++
 2 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/lib/active_model/serializer.rb b/lib/active_model/serializer.rb
index cceba3f4e..4579fed0e 100644
--- a/lib/active_model/serializer.rb
+++ b/lib/active_model/serializer.rb
@@ -56,7 +56,9 @@ def format_keys(format)
       attr_reader :key_format
 
       def serializer_for(resource, options = {})
-        if resource.respond_to?(:to_ary)
+        if resource.respond_to?(:serializer_class)
+          resource.serializer_class
+        elsif resource.respond_to?(:to_ary)
           if Object.constants.include?(:ArraySerializer)
             ::ArraySerializer
           else
diff --git a/test/unit/active_model/array_serializer/serialization_test.rb b/test/unit/active_model/array_serializer/serialization_test.rb
index 4d3a71dcb..890e7a09a 100644
--- a/test/unit/active_model/array_serializer/serialization_test.rb
+++ b/test/unit/active_model/array_serializer/serialization_test.rb
@@ -35,6 +35,23 @@ def test_serializer_for_array_returns_appropriate_type
       end
     end
 
+    class CustomSerializerClassTest < Minitest::Test
+      def setup
+        Object.const_set(:CustomSerializer, Class.new)
+      end
+
+      def teardown
+        Object.send(:remove_const, :CustomSerializer)
+      end
+
+      def test_serializer_for_array_returns_appropriate_type
+        object = {}
+        def object.serializer_class; CustomSerializer; end
+
+        assert_equal CustomSerializer, Serializer.serializer_for(object)
+      end
+    end
+
     class ModelSerializationTest < Minitest::Test
       def test_array_serializer_serializes_models
         array = [Profile.new({ name: 'Name 1', description: 'Description 1', comments: 'Comments 1' }),