fix(ingredient/page_serializer): Wrap page in decorator

We need the Page decorator in order to serialize it
and its elements.

Author: tvdeyen

app/serializers/alchemy/json_api/ingredient_page_serializer.rb

@@ -19,7 +19,9 @@ class IngredientPageSerializer < BaseSerializer
         ingredient.page&.url_path
       end
 
-      has_one :page, record_type: :page, serializer: ::Alchemy::JsonApi::PageSerializer
+      has_one :page, record_type: :page, serializer: PageSerializer do |ingredient|
+        ingredient.page&.tap { Page.new(_1) }
+      end
     end
   end
 end

spec/serializers/alchemy/json_api/ingredient_page_serializer_spec.rb

@@ -3,8 +3,8 @@
 require "rails_helper"
 
 RSpec.describe Alchemy::JsonApi::IngredientPageSerializer do
-  let(:ingredient) { FactoryBot.build_stubbed(:alchemy_ingredient_page, page: page) }
-  let(:page) { FactoryBot.build_stubbed(:alchemy_page) }
+  let(:ingredient) { FactoryBot.create(:alchemy_ingredient_page, page: page) }
+  let(:page) { FactoryBot.create(:alchemy_page) }
 
   let(:serializer) { described_class.new(ingredient) }
 
@@ -38,7 +38,7 @@
     let(:page) { nil }
 
     describe "attributes" do
-      it "has no ingredient" do
+      it "has no value" do
         expect(subject[:value]).to be_nil
       end