[Feat] render_serialized_json now works with root_key and meta

These options are passed to `serialize` method.

lib/alba/railtie.rb

@@ -7,13 +7,14 @@ class Railtie < Rails::Railtie
       Alba.inflector = :active_support
 
       ActiveSupport.on_load(:action_controller) do
-        define_method(:serialize) do |obj, with: nil, &block|
-          with.nil? ? Alba.resource_with(obj, &block) : with.new(obj)
+        define_method(:serialize) do |obj, with: nil, root_key: nil, meta: {}, &block|
+          resource = with.nil? ? Alba.resource_with(obj, &block) : with.new(obj)
+          resource.to_json(root_key: root_key, meta: meta)
         end
 
-        define_method(:render_serialized_json) do |obj, with: nil, &block|
+        define_method(:render_serialized_json) do |obj, with: nil, root_key: nil, meta: {}, &block|
           json = with.nil? ? Alba.resource_with(obj, &block) : with.new(obj)
-          render json: json
+          render json: json.to_json(root_key: root_key, meta: meta)
         end
       end
     end

test/dependencies/railties_test.rb

@@ -46,6 +46,18 @@ def index
     end
   end
 
+  class MyFoosController < ActionController::Base
+    def show
+      foo = Foo.new(1, 'foo')
+      render json: serialize(foo, root_key: 'foo')
+    end
+
+    def index
+      foo = Foo.new(1, 'foo')
+      render_serialized_json([foo], with: FooResource, root_key: 'foos', meta: {total: 1})
+    end
+  end
+
   Foo = Struct.new(:id, :name)
 
   class FooResource
@@ -94,6 +106,18 @@ def test_foos_api_controller_index
     assert_equal '[{"id":1,"name":"foo"}]', controller.response_body.first
   end
 
+  def test_foos_controller_show_with_options
+    controller = controller_instance(MyFoosController)
+    controller.show
+    assert_equal '{"foo":{"id":1,"name":"foo"}}', controller.response_body.first
+  end
+
+  def test_foos_controller_index_with_options
+    controller = controller_instance(MyFoosController)
+    controller.index
+    assert_equal '{"foos":[{"id":1,"name":"foo"}],"meta":{"total":1}}', controller.response_body.first
+  end
+
   private
 
   def controller_instance(controller_class)