How can I create a query on nested documents? - mongodb

Question

I am trying to find a document inside nested collection, but I do not know how should I create query for this. In TypeORM documentation there is only one simple example how to use find/findOne on not nested documents.
I created this query:
const result: BlogEntity = await this.blogRepository.findOne({posts: {_id: article._id}});
but when I am trying to build my project i am getting this error:
error TS2345: Argument of type '{ posts: { _id: ObjectID; }; }' is not assignable to parameter of type 'string | number | Date | ObjectID | FindOneOptions | Partial'.
After this i also tried :
const result: BlogEntity = await this.blogRepository.findOne({posts: {_id: article._id}});
const result: BlogEntity = await this.blogRepository.findOne({'posts._id': article._id});
const result: BlogEntity = await this.blogRepository.findOne({where: {posts: { _id: article._id}}});
const result: BlogEntity = await this.blogRepository.findOne({where: {'posts._id': _id: article._id}});
const result: ArticleEntity = await this.mongoManager.findOne(ArticleEntity, {_id: article._id});
But none of them is working
So the question is how should i correctly create this find query. BlogEntity and ArticleEntity code bellow
BlogEntity
#Entity()
#ObjectType()
export class BlogEntity {
#Field(() => ID)
#ObjectIdColumn()
_id!: ObjectID;
#Field(() => [ArticleEntity])
#Column()
posts!: ArticleEntity[];
#Field(() => [ArticleEntity])
#Column()
projects!: ArticleEntity[];
#Field(() => [ArticleEntity])
#Column()
tutorials!: ArticleEntity[];
}
ArticleEntity
#Entity()
#ObjectType()
export class ArticleEntity {
#Field(() => ID)
#ObjectIdColumn()
_id!: ObjectID;
#Field()
#Column()
title!: string;
#Field(() => [String])
#Column()
tags!: string[];
#Field()
#Column()
release!: Date;
#Field(() => [SectionEntity])
#Column()
sections!: SectionEntity[];
#Field({ nullable: true })
#Column()
tutorial?: string;
#Field({ nullable: true })
#Column()
app?: string;
}
If you need anything else ping me in the comment section.

Answer 1

When you are working with nested object's you need to use (.) operator
await this.blogRepository.findOne({'posts._id': article._id});

Answer 2

So it is impossible to achive this in TypeORM. The only one solution which I see there is to swich to Typegoose or Mongoose.
If you are more interested in this issue you can read more here: Issue: Query an Array of Embedded Documents #2483