Best way to add helper methods on TypeORM models

user.ts

import {
  Entity,
  PrimaryGeneratedColumn,
  Column,
  OneToMany,
  BeforeInsert,
  OneToOne,
  Connection
} from 'typeorm';

export class User {

  @PrimaryGeneratedColumn('uuid')
  id: string;

  @Column('varchar', { length: 255, unique: true })
  email: string;

  @Column('text', { nullable: true })
  password: string;

  async setPassword(connection: Connection, unencodedPassword: string): Promise<User> {
    const userRepo = connection.getRepository(User);

    this.password = await encrpytPassword(unencodedPassword);
    this.passwordSetOn = new Date();

    return userRepo.save(this);
  }

}
    
    
// then to use:
User user =  connection.getRepository(User).findOneOrFail({id: userId})
    
user.setPassword(connection, 'secretPassword')