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Version: 2.7

Naming strategy

When mapping your entities to database tables and columns, their names will be defined by naming strategy. There are 2 basic naming strategies you can choose from:

  • UnderscoreNamingStrategy - default of MySqlDriver and SqliteDriver
  • MongoNamingStrategy - default of MongoDriver

You can override this when initializing ORM. You can also provide your own naming strategy, just implement NamingStrategy interface and provide your implementation when bootstrapping ORM:

class YourCustomNamingStrategy implements NamingStrategy {

const orm = await MikroORM.init({
namingStrategy: YourCustomNamingStrategy,

Naming strategy in mongo driver

MongoNamingStrategy will simply use all field names as they are defined. Collection names will be translated into lower-cased dashed form:

MyCoolEntity will be translated into my-cool-entity collection name.

Naming strategy in SQL drivers

MySqlDriver defaults to UnderscoreNamingStrategy, which means your all your database tables and columns will be lower-cased and words divided by underscored:

CREATE TABLE `author` (
`id` int(11) unsigned NOT NULL AUTO_INCREMENT,
`created_at` datetime(3) DEFAULT NULL,
`updated_at` datetime(3) DEFAULT NULL,
`terms_accepted` tinyint(1) DEFAULT NULL,
`name` varchar(255) DEFAULT NULL,
`email` varchar(255) DEFAULT NULL,
`born` datetime DEFAULT NULL,
`favourite_book_id` int(11) DEFAULT NULL,