COMPATIBILITY: categories are being loaded differently on Site model

See 0e4b8c5318

serializers/custom_wizard/wizard_serializer.rb

@@ -8,11 +8,11 @@ class CustomWizard::WizardSerializer < CustomWizard::BasicWizardSerializer
              :completed,
              :required,
              :permitted,
-             :uncategorized_category_id
+             :uncategorized_category_id,
+             :categories
 
   has_many :steps, serializer: ::CustomWizard::StepSerializer, embed: :objects
   has_one :user, serializer: ::BasicUserSerializer, embed: :objects
-  has_many :categories, serializer: ::BasicCategorySerializer, embed: :objects
   has_many :groups, serializer: ::BasicGroupSerializer, embed: :objects
 
   def completed
@@ -56,4 +56,8 @@ class CustomWizard::WizardSerializer < CustomWizard::BasicWizardSerializer
   def include_uncategorized_category_id?
     object.needs_categories
   end
+
+  def categories
+    object.categories.map { |c| c.to_h }
+  end
 end