@loopback/docs/site/apidocs/repository.defaultcrudrepository.createhasonerepositoryfactoryfor.md

Documentation for LoopBack 4

---
lang: en
title: 'API docs: repository.defaultcrudrepository.createhasonerepositoryfactoryfor'
keywords: LoopBack 4.0, LoopBack 4
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permalink: /doc/en/lb4/apidocs.repository.defaultcrudrepository.createhasonerepositoryfactoryfor.html
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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [DefaultCrudRepository](./repository.defaultcrudrepository.md) &gt; [createHasOneRepositoryFactoryFor](./repository.defaultcrudrepository.createhasonerepositoryfactoryfor.md)

## DefaultCrudRepository.createHasOneRepositoryFactoryFor() method

Function to create a constrained hasOne relation repository factory

<b>Signature:</b>

```typescript
protected createHasOneRepositoryFactoryFor<Target extends Entity, TargetID, ForeignKeyType>(relationName: string, targetRepoGetter: Getter<EntityCrudRepository<Target, TargetID>>): HasOneRepositoryFactory<Target, ForeignKeyType>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  relationName | <code>string</code> | Name of the relation defined on the source model |
|  targetRepoGetter | <code>Getter&lt;EntityCrudRepository&lt;Target, TargetID&gt;&gt;</code> |  |

<b>Returns:</b>

`HasOneRepositoryFactory<Target, ForeignKeyType>`