class ActiveLdap::Association::BelongsToMany

def delete_entries(entries)
  _foreign_class = foreign_class
  entries.each do |entry|
    entry = _foreign_class.find(entry) unless entry.is_a?(_foreign_class)
    old_value = entry[@options[:many], true]
    primary_key_name = @options[:primary_key_name]
    if primary_key_name == "dn"
      old_value = dn_values_to_string_values(old_value)
    end
    current_value = @owner[primary_key_name, true]
    current_value = dn_values_to_string_values(current_value)
    new_value = old_value - current_value
    new_value = new_value.uniq.sort
    if old_value != new_value
      entry[@options[:many]] = new_value
      entry.save
    end
  end
end