/**
* Generates a safe and unambiguous field table name.
*
* The method accounts for a maximum table name length of 64 characters, and
* takes care of disambiguation.
*
* @param \Drupal\Core\Field\FieldStorageDefinitionInterface $storage_definition
* The field storage definition.
* @param bool $revision
* TRUE for revision table, FALSE otherwise.
*
* @return string
* The final table name.
*/
protected function generateFieldTableName(FieldStorageDefinitionInterface $storage_definition, $revision)
{
$separator = $revision ? '_revision__' : '__';
$table_name = $storage_definition->getTargetEntityTypeId() . $separator . $storage_definition->getName();
// Limit the string to 48 characters, keeping a 16 characters margin for db
// prefixes.
if (strlen($table_name) > 48) {
// Use a shorter separator, a truncated entity_type, and a hash of the
// field UUID.
$separator = $revision ? '_r__' : '__';
// Truncate to the same length for the current and revision tables.
$entity_type = substr($storage_definition->getTargetEntityTypeId(), 0, 34);
$field_hash = substr(hash('sha256', $storage_definition->getUniqueStorageIdentifier()), 0, 10);
$table_name = $entity_type . $separator . $field_hash;
}
return $table_name;
}
