public function update_column_uuid()
{
$this->module->model->assert_not_has_column('uuid')->create_column('uuid');
#
# Update records with UUID values.
#
$target = $this->module->model->target;
$tokens = $target->select('nid, NULL')->pairs;
foreach (array_keys($tokens) as $nid) {
for (;;) {
$token = \ICanBoogie\generate_v4_uuid();
if (!in_array($token, $tokens)) {
break;
}
}
$tokens[$nid] = $token;
}
$update = $target->prepare("UPDATE `{self}` SET `uuid` = ? WHERE `nid` = ?");
foreach ($tokens as $nid => $token) {
$update($token, $nid);
}
#
# Create index.
#
$this->module->model->create_unique_index('uuid');
}
/**
* Returns a UUID.
*
* @return string
*/
public function obtain_uuid()
{
for (;;) {
$uuid = \ICanBoogie\generate_v4_uuid();
if (!$this->filter_by_uuid($uuid)->exists) {
return $uuid;
}
}
}
