@mikro-orm/core/naming-strategy/UnderscoreNamingStrategy.js

TypeScript ORM for Node.js based on Data Mapper, Unit of Work and Identity Map patterns. Supports MongoDB, MySQL, PostgreSQL and SQLite databases as well as usage with vanilla JavaScript.

import { AbstractNamingStrategy } from './AbstractNamingStrategy.js';
/** Naming strategy that converts camelCase names to snake_case for table and column names. */
export class UnderscoreNamingStrategy extends AbstractNamingStrategy {
    classToTableName(entityName, tableName) {
        return tableName ?? this.underscore(entityName);
    }
    joinColumnName(propertyName) {
        return this.underscore(propertyName) + '_' + this.referenceColumnName();
    }
    joinKeyColumnName(entityName, referencedColumnName, composite, tableName) {
        return this.classToTableName(entityName, tableName) + '_' + (referencedColumnName || this.referenceColumnName());
    }
    joinTableName(sourceEntity, targetEntity, propertyName, tableName) {
        return this.classToTableName(sourceEntity, tableName) + '_' + this.classToTableName(propertyName);
    }
    propertyToColumnName(propertyName, object) {
        return this.underscore(propertyName);
    }
    referenceColumnName() {
        return 'id';
    }
    underscore(name) {
        return name.replace(/([a-z])([A-Z])/g, '$1_$2').toLowerCase();
    }
}