code: def convert_field_to_html(cr, table, field_name, html_field_name):
      
      if version_info[0] < 7:
          logger.error("You cannot use this method in an OpenUpgrade version "
                       "prior to 7.0.")
          return
      cr.execute(
          "SELECT id, %(field)s FROM %(table)s WHERE %(field)s IS NOT NULL" % {
              'field': field_name,
              'table': table,
          }
      )
      for row in cr.fetchall():
          logged_query(
              cr, "UPDATE %(table)s SET %(field)s = %%s WHERE id = %%s" % {
                  'field': html_field_name,
                  'table': table,
              }, (plaintext2html(row[1]), row[0])
          )
docs: Convert field value to HTML value.
  
      .. versionadded:: 7.0