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docs(typescript): recommend using HydratedSingleSubdocument over Types.Subdocument #15240

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Feb 8, 2025
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docs(typescript): recommend using HydratedSingleSubdocument over Types.Subdocument #15240

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6 changes: 5 additions & 1 deletion docs/typescript/subdocuments.md
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Original file line number Diff line number Diff line change
Expand Up @@ -38,9 +38,11 @@ Define a separate `THydratedDocumentType` and pass it as the 5th generic param t
`THydratedDocumentType` controls what type Mongoose uses for "hydrated documents", that is, what `await UserModel.findOne()`, `UserModel.hydrate()`, and `new UserModel()` return.

```ts
import { HydratedSingleSubdocument } from 'mongoose';

// Define property overrides for hydrated documents
type THydratedUserDocument = {
names?: mongoose.Types.Subdocument<Names>
names?: HydratedSingleSubdocument<Names>
}
type UserModelType = mongoose.Model<User, {}, {}, {}, THydratedUserDocument>;

Expand All @@ -51,6 +53,7 @@ const UserModel = mongoose.model<User, UserModelType>('User', userSchema);

const doc = new UserModel({ names: { _id: '0'.repeat(24), firstName: 'foo' } });
doc.names!.ownerDocument(); // Works, `names` is a subdocument!
doc.names!.firstName; // 'foo'
```

## Subdocument Arrays
Expand Down Expand Up @@ -81,4 +84,5 @@ const UserModel = model<User, UserModelType>('User', new Schema<User, UserModelT

const doc = new UserModel({});
doc.names[0].ownerDocument(); // Works!
doc.names[0].firstName; // string
```