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

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---
lang: en
title: 'API docs: repository.defaultcrudrepository.createhasonerepositoryfactoryfor'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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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

**Signature:**

```typescript
protected createHasOneRepositoryFactoryFor<Target extends Entity, TargetID, ForeignKeyType>(relationName: string, targetRepositoryGetter: Getter<EntityCrudRepository<Target, TargetID>> | {
        [repoType: string]: Getter<EntityCrudRepository<Target, TargetID>>;
    }): HasOneRepositoryFactory<Target, ForeignKeyType>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  relationName | string | Name of the relation defined on the source model |
|  targetRepositoryGetter | Getter&lt;[EntityCrudRepository](./repository.entitycrudrepository.md)<!-- -->&lt;Target, TargetID&gt;&gt; \| { \[repoType: string\]: Getter&lt;[EntityCrudRepository](./repository.entitycrudrepository.md)<!-- -->&lt;Target, TargetID&gt;&gt;; } |  |

**Returns:**

[HasOneRepositoryFactory](./repository.hasonerepositoryfactory.md)<!-- -->&lt;Target, ForeignKeyType&gt;