Routes helpers available inside ArraySerializer

lib/active_model/array_serializer.rb

@@ -39,6 +39,10 @@ def initialize(object, options={})
       @options = options
     end
 
+    def url_options
+      @options[:url_options] || {}
+    end
+
     def serialize_object
       serializable_array
     end

lib/active_model_serializers.rb

@@ -22,6 +22,12 @@ class Railtie < Rails::Railtie
           extend ::AbstractController::Railties::RoutesHelpers.with(app.routes)
           include app.routes.mounted_helpers
         end
+
+        ActiveSupport.on_load(:active_model_array_serializers) do
+          include AbstractController::UrlFor
+          extend ::AbstractController::Railties::RoutesHelpers.with(app.routes)
+          include app.routes.mounted_helpers
+        end
       end
 
       initializer "caching.active_model_serializer" do |app|
@@ -93,3 +99,4 @@ def active_model_serializer
 end
 
 ActiveSupport.run_load_hooks(:active_model_serializers, ActiveModel::Serializer)
+ActiveSupport.run_load_hooks(:active_model_array_serializers, ActiveModel::ArraySerializer)

test/array_serializer_test.rb

@@ -82,4 +82,27 @@ def active_model_serializer
       { "value" => "something" }
     ], serializer.as_json)
   end
+
+  def test_active_support_on_load_hooks_fired
+    loaded = nil
+    ActiveSupport.on_load(:active_model_array_serializers) do
+      loaded = self
+    end
+    assert_equal ActiveModel::ArraySerializer, loaded
+  end
+
+  def test_serializer_receives_url_options
+    array = []
+    options = {url_options: { host: "test.local" }}
+    serializer = array.active_model_serializer.new(array, options)
+
+    assert_equal({ host: "test.local" }, serializer.url_options)
+  end
+
+  def test_serializer_returns_empty_hash_without_url_options
+    array = []
+    serializer = array.active_model_serializer.new array
+
+    assert_equal({}, serializer.url_options)
+  end
 end