How to get the specified expose

User Entity

  class User < EEntity
    expose :id, :name, :pinyin, :account_id, :hidden, :dept_id, :actived
    expose :initialism, as: :short_pinyin
    expose :role_code
    expose :login_name
    expose(:email, if: lambda { |u, op| op[:included_user_email] == true }) do |u, options|
      u.email
    end
    expose :cellvoice1, if: lambda { |u, op| !op[:no_privacy] } do |u, options|
      if u.get_user_info
        u.get_user_info.cellvoice1
      else
        nil
      end
    end
    expose :nickname do |u, options|
      if u.get_user_info
        u.get_user_info.nickname
      else
        nil
      end
    end
    expose :workvoice do |u, options|
      if u.get_user_info
        u.get_user_info.workvoice
      else
        nil
      end
    end
    expose :dept_name do |u, options|
      uinfo = u.get_user_info
      if uinfo
        uinfo.get_dept_display_name
      else
        nil
      end
    end
end

How to get some of these exposes?
example:

::Entity::User.represent_only([:name.:pinyin, :account_id, :hidden, :dept_id ],{}).as_json

Result:

{
  name: 'xxx',
  pinyin: 'xxx',
  account_id: 1,
  hidden: true,
  dept_id: 2
}

The issue shows User's expose declarations and the Entity::User.represent_only call; start by checking how represent_only handles the listed symbols and options hash. Document the correct selection syntax and the expected JSON result, including conditional exposes.