# File lib/devise_ldap_authenticatable/ldap/connection.rb, line 48
      def dn
        @dn ||= begin
          DeviseLdapAuthenticatable::Logger.send("LDAP dn lookup: #{@attribute}=#{@login}")
          ldap_entry = search_for_login
          if ldap_entry.nil?
            @ldap_auth_username_builder.call(@attribute,@login,@ldap)
          else
            ldap_entry.dn
          end
        end
      end