pg-db-libs/src/PgEntityMapper.ts

A TypeScript library for calling PostgreSQL functions and procedures with entity mapping

import { Client, ClientConfig } from "pg";

export class PgEntityMapper {
  /**
   * Maps a database row to an entity by matching keys to the instance properties.
   * @param row The database row to map.
   * @param entityInstance An instance of the entity to use for property mapping.
   * @returns The mapped entity instance.
   */
  static mapToEntity<T extends object>(row: any, entityInstance: T): T {
    const entity = { ...entityInstance };
    Object.keys(row).forEach((key) => {
      if (key in entity) {
        (entity as any)[key] = row[key];
      }
    });
    return entity as T;
  }

  /**
   * Maps a list of rows to entity instances.
   * @param rows The list of database rows.
   * @param entityInstance An instance of the entity to use for property mapping.
   * @returns A list of mapped entity instances.
   */
  static mapToEntities<T extends object>(rows: any[], entityInstance: T): T[] {
    return rows.map((row) => this.mapToEntity(row, entityInstance));
  }
}