serializer_for Array

lib/active_model/serializer.rb

@@ -1,5 +1,10 @@
 module ActiveModel
   class Serializer
+    extend ActiveSupport::Autoload
+    autoload :Configuration
+    autoload :ArraySerializer
+    include Configuration
+
     class << self
       attr_accessor :_attributes
       attr_accessor :_associations
@@ -56,24 +61,14 @@ module ActiveModel
       end
     end
 
-    if RUBY_VERSION >= '2.0'
-      def self.serializer_for(resource)
-        if resource.respond_to?(:to_ary)
-          ArraySerializer
-        else
-          begin
-            Object.const_get "#{resource.class.name}Serializer"
-          rescue NameError
-            nil
-          end
-        end
-      end
-    else
-      def self.serializer_for(resource)
-        if resource.respond_to?(:to_ary)
-          ArraySerializer
-        else
-          "#{resource.class.name}Serializer".safe_constantize
+    def self.serializer_for(resource)
+      if resource.respond_to?(:to_ary)
+        config.array_serializer
+      else
+        serializer_name = "#{resource.class.name}Serializer"
+
+        if Object.const_defined?(serializer_name)
+          Object.const_get(serializer_name)
         end
       end
     end

lib/active_model/serializer/array_serializer.rb

@@ -0,0 +1,7 @@
+module ActiveModel
+  class Serializer
+    class ArraySerializer
+
+    end
+  end
+end

lib/active_model/serializer/configuration.rb

@@ -0,0 +1,12 @@
+module ActiveModel
+  class Serializer
+    module Configuration
+      include ActiveSupport::Configurable
+      extend ActiveSupport::Concern
+
+      included do |base|
+        base.config.array_serializer = ActiveModel::Serializer::ArraySerializer
+      end
+    end
+  end
+end

lib/active_model_serializers.rb

@@ -1,8 +1,6 @@
 require "active_model"
 require "active_model/serializer/version"
-
 require "active_model/serializer"
-
 require "active_model/serializer/adapter/null_adapter"
 
 begin

test/serializers/configuration_test.rb

@@ -0,0 +1,11 @@
+require 'test_helper'
+
+module ActiveModel
+  class Serializer
+    class ConfigurationTest < Minitest::Test
+      def test_array_serializer
+        assert_equal ActiveModel::Serializer::ArraySerializer, ActiveModel::Serializer.config.array_serializer
+      end
+    end
+  end
+end

test/serializers/serializer_for_test.rb

@@ -0,0 +1,28 @@
+require 'test_helper'
+
+module ActiveModel
+  class Serializer
+    class SerializerForTest < Minitest::Test
+      def setup
+        @array = [1, 2, 3]
+        @previous_array_serializer = ActiveModel::Serializer.config.array_serializer
+      end
+
+      def teardown
+        ActiveModel::Serializer.config.array_serializer = @previous_array_serializer
+      end
+
+      def test_serializer_for_array
+        serializer = ActiveModel::Serializer.serializer_for(@array)
+        assert_equal ActiveModel::Serializer.config.array_serializer, serializer
+      end
+
+      def test_overwritten_serializer_for_array
+        new_array_serializer = Class.new
+        ActiveModel::Serializer.config.array_serializer = new_array_serializer
+        serializer = ActiveModel::Serializer.serializer_for(@array)
+        assert_equal new_array_serializer, serializer
+      end
+    end
+  end
+end