TS: _id not required on DocumentArray properties of documents returned from query about mongoose HOT 3 OPEN

export const getParents = async (): Promise<ExpectedParent[]> => {
  const parents = await ParentModel.find<ExpectedParent>();
  return parents;
};

// Recursive type to enforce `_id` in all subdocuments
type EnforceIdInSubdocuments<T> = {
  [K in keyof T]: T[K] extends mongoose.Types.DocumentArray<infer U>
    ? mongoose.Require_id<U>[]
    : T[K] extends object
    ? EnforceIdInSubdocuments<T[K]>
    : T[K];
};

// Utility type to extract and enforce _id in subdocuments
type ModelWithEnforcedIds<T extends mongoose.Model<any>> = EnforceIdInSubdocuments<
  mongoose.InferSchemaType<T['schema']>
>;

import mongoose from 'mongoose';

const ChildSchema = new mongoose.Schema({
  name: { type: String, required: true },
});

const ParentSchema = new mongoose.Schema({
  _id: { type: String, required: true },
  name: { type: String, required: true },
  parts: { type: [ChildSchema] },
});

const ParentModel = mongoose.model('Parent', ParentSchema);


export const getParents = async (): Promise<ExpectedParent[]> => {
  const parents = await ParentModel.find<ModelWithEnforcedIds<typeof ParentModel>>();
  return parents;
};

interface ExpectedParent {
  _id: string;
  name: string;
  parts: Array<{ _id: string; name: string }>;
}

// Recursive type to enforce `_id` in all subdocuments
type EnforceIdInSubdocuments<T> = {
  [K in keyof T]: T[K] extends mongoose.Types.DocumentArray<infer U>
    ? mongoose.Require_id<U>[]
    : T[K] extends object
    ? EnforceIdInSubdocuments<T[K]>
    : T[K];
};

// Utility type to extract and enforce _id in subdocuments
type ModelWithEnforcedIds<T extends mongoose.Model<any>> = EnforceIdInSubdocuments<
  mongoose.InferSchemaType<T['schema']>
>;

const ChildSchema = new mongoose.Schema({
  _id: { type: String, required: true }, // <-- add _id here
  name: { type: String, required: true },
});

const ChildSchema = new mongoose.Schema({
  _id: { type: 'ObjectId', required: true }, // <-- change _id type here
  name: { type: String, required: true },
});

interface ExpectedParent {
  _id: string;
  name: string;
  parts: Array<{ _id: mongoose.Types.ObjectId; name: string }>; // <-- change _id type here
}