discourse/app/serializers/user_summary_serializer.rb

class UserSummarySerializer < ApplicationSerializer
  class TopicSerializer < BasicTopicSerializer
    attributes :like_count, :slug, :created_at
  end

  class ReplySerializer < ApplicationSerializer
    attributes :post_number, :like_count, :created_at
    has_one :topic, serializer: TopicSerializer
  end

  has_many :topics, serializer: TopicSerializer
  has_many :replies, serializer: ReplySerializer, embed: :object
  has_many :badges, serializer: UserBadgeSerializer, embed: :object

  attributes :likes_given, :likes_received, :posts_read_count,
             :days_visited, :topic_count, :post_count


  def include_badges?
    SiteSetting.enable_badges
  end
end