How to easily differentiate between "subdocument" & "nestedpath"?

[vanuverma]

I have a NestJs code where a schema is defined like below:

`
import { Prop, raw, Schema } from "@nestjs/mongoose";
import { Document } from "mongoose";
import { ObjectId } from "mongodb";
import { CSharpDate, CSharpDateInterface } from "./utils";

@Schema()
export class UserConsent extends Document {
@prop({ required: true })
UserAccountId!: string;

@Prop()
Result?: string;

@Prop({ required: true })
CorrelationId!: string;

@Prop({ type: ObjectId, default: null })
ProfileId?: ObjectId | null;

@Prop(raw({ type: CSharpDate, required: true }))
CreatedAt!: CSharpDateInterface;

@Prop(raw({ type: CSharpDate, default: null }))
UpdatedAt?: CSharpDateInterface | null;

}

`

and the CSharpDate type and CSharpDateInterface are defined as below (note that the CSharpDate does not have a @Schema() decorator on it):
`export interface CSharpDateInterface {
DateTime: Date;
Ticks: number;
Offset: number;
}

export const CSharpDate = {
DateTime: Date,
Ticks: Number,
Offset: Number,
};`

My question here: will the CreatedAt property be treated as "Subdocument" or "Nestedpath" by Mongoose? And why would it contain an "_id" field when saved into database collection?

[vkarpov15]

As a subdocument. You can disable _id by doing @Prop(raw({ type: CSharpDate, required: true, _id: false })) or export const CSharpDate = { _id: false, ... }