I would like to be able to perform queries to the db inside a method of a Typeorm entity when it is about to be saved.

The problem is if the entity will be saved within a transaction, I can't access this transaction to perform my queries and I can get weird results because I am not using the right transactionalEntityManager.

My entity :

class User {
    @PrimaryGeneratedColumn()
    id: number;
    ....

    @BeforeUpdate()
    @BeforeInsert() // this method will be executed before the entity is saved in db
    async validateBefore(): Promise<void> {
        await getManager().find(.....) 
        /*
          I use getManager to perform a query on the db,
          but this just gives me a new entityManager different from the current transaction
        */
    }
}

Controller:

await getManager().transaction(async (transactionalEntityManager) => {
    const newUser: User = plainToClass(User, {.....})
    // I use plainToClass from class-transformer to instantiate a User entity from a plain object

    await transactionalEntityManager.save(newUSer) // I save the entity to the db with the transaction manager
    // this will fail because this will trigger the validateBefore method which doesn't use the right transactionalEntityManager
})

Is there a way to pass the entity manager to the entity method ?