[Question] Extending existing Typegoose Class within same collection

[HendrikRoth]

Hello everyone,
is it possible to extend a created typegoose class (entity) but using the same collection as the parent class?

example:

class Base extends Typegoose {
  @prop()
  name: string;
}

class Extended extends Base {
  @prop()
  age: number;
}

instead of creating a new collection for extended i would like to use the same base collection. Is this possible and how? I tried to use mongoose SchemaOptions, but seams not to work for this variant?

const ExtendedModel = new Extended().getModelForClass(Extended, { schemaOptions: { collection: "base" } });

The goal is to be able to query the mongo database with the BaseModel helper.

const BaseModel = new Base().getModelForClass(Base);
await BaseModel.findById(...);

// should deliver also the extended entries.

[hasezoey]

so when i understand this correctly:

• you want to have a parent model
• you want to have a child model, extending the parent model
• you want the parent & child to use the same collection
• and you want to still query the child model, but only with the values from the parent model

right?

---

yes, it is half possible:

• you can have a child & parent in the same collection with Discriminators, BUT they are currently not supported with typegoose, WIP: Discriminators #333 adds it, but also breaks some things, so no merge in the near future
• and no, to my knowledge it is not possible, at least not with typegoose and the correct types ...

[HendrikRoth]

Yes you did understand me right.
Ok, than i have to figure out how to change my structure, thank you

[hasezoey]

i consider it solved | closed now, thanks that i could help