Nest JS and Mongo DB

Question

I have this entity:

import {
    Column,
    CreateDateColumn,
    Entity,
    JoinColumn,
    ManyToOne,
    ObjectID,
    ObjectIdColumn,
  } from 'typeorm';
  import { Transform, Type } from 'class-transformer';
  import { User } from './user.entity';
  import { Prop } from '@nestjs/mongoose';
   import mongoose from 'mongoose';
  
  @Entity({ name: 'forgotpassword' })
  export class ForgotPassword {
    @ObjectIdColumn({ readonly: true })
    @Transform(({ value }) => value.toString(), { toPlainOnly: true })
    _id: ObjectID;

    @Transform(({ value }) => value.toString(), { toPlainOnly: true })
    @ManyToOne(() => User, {eager: true})
    @JoinColumn({name: 'userId'})
    userId: User;
  
    @Column({ type: 'string' })
    code: string;

    @CreateDateColumn()
    createdAt: Date;
  }

and this method:

const forgotPass = await this.forgotPassRepo.findBy({
  where: {
    code: data.code,
  },
});

when i try to get the userId i found that it not returned, although it existed in the document in the MongoDB, why these happen?

How can I resolve the problem? or tell me if there is a better solution