discourse/app/serializers/site_serializer.rb

class SiteSerializer < ApplicationSerializer

  attributes :default_archetype, 
             :notification_types,
             :post_types

  has_many :categories, embed: :objects
  has_many :post_action_types, embed: :objects
  has_many :trust_levels, embed: :objects
  has_many :archetypes, embed: :objects, serializer: ArchetypeSerializer


  def default_archetype
    Archetype.default
  end

  def post_types
    {regular: Post::REGULAR, moderator_action: Post::MODERATOR_ACTION}
  end
  
end