Schema.name undefined while making Many-To-One relation reference with Nestjs & MongoDb

Question

I want to attach and see all the posts of the user inside posts property of UserSchema. The user/Author id is getting stored with posts. But when I try the get posts ids

I'm getting the following error.

  @Prop([{ type: mongoose.Schema.Types.ObjectId, ref: BlogPost.name }])
                                                               ^
TypeError: Cannot read properties of undefined (reading 'name')
    at Object.<anonymous> (D:\Noum\Data\CYBRNODE\MAN STACK\Cybrnode-Blog-Backend\Cybr-Blog-Nest-Backend\src\schema\user.schema.ts:45:64)
    at Module._compile (node:internal/modules/cjs/loader:1126:14)
    at Object.Module._extensions..js (node:internal/modules/cjs/loader:1180:10)
    at Module.load (node:internal/modules/cjs/loader:1004:32)

Blog Schema

import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
import { ApiProperty } from '@nestjs/swagger';
import mongoose, { Document } from 'mongoose';

import { User } from 'src/schema/user.schema';

@Schema({ timestamps: true })
export class BlogPost {

  @ApiProperty({ required: true })
  @Prop({ type: mongoose.Schema.Types.ObjectId, ref: User.name })
  author: User;

}

export const postSchema = SchemaFactory.createForClass(BlogPost);
export type postDocument = BlogPost & Document;

User Schema

import { Prop, Schema, SchemaFactory } from '@nestjs/mongoose';
import { ApiProperty } from '@nestjs/swagger';
import mongoose, { Document } from 'mongoose';

import { BlogPost } from 'src/schema/blog.schema';

@Schema({ timestamps: true })
export class User {
  @ApiProperty()
  @Prop([{ type: mongoose.Schema.Types.ObjectId, ref: BlogPost.name }])
  posts: BlogPost[];
}

export const userSchema = SchemaFactory.createForClass(User);
export type userDocument = User & Document;

Also I've imported UserModule into BlogPostModule and vice versa. And exported the services of both modules.

I've tried with these as well. But Error is same

import { Document, Schema as MongooseSchema } from 'mongoose';
export class User extends Document{
 @ApiProperty()
  @Prop([{ type:  MongooseSchema.Types.ObjectId, ref: BlogPost.name }])
  posts: BlogPost[];

}

export const userSchema = SchemaFactory.createForClass(User);
export type userDocument = User & Document;