@loopback/docs/site/apidocs/sequelize.sequelizecrudrepository.createhasonerepositoryfactoryfor.md

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title: 'API docs: sequelize.sequelizecrudrepository.createhasonerepositoryfactoryfor'
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[Home](./index.md) &gt; [@loopback/sequelize](./sequelize.md) &gt; [SequelizeCrudRepository](./sequelize.sequelizecrudrepository.md) &gt; [createHasOneRepositoryFactoryFor](./sequelize.sequelizecrudrepository.createhasonerepositoryfactoryfor.md)

## SequelizeCrudRepository.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

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

relationName


</td><td markdown="1">

string


</td><td markdown="1">

Name of the relation defined on the source model


</td></tr>
<tr><td markdown="1">

targetRepositoryGetter


</td><td markdown="1">

Getter&lt;EntityCrudRepository&lt;Target, TargetID&gt;&gt; \| { \[repoType: string\]: Getter&lt;EntityCrudRepository&lt;Target, TargetID&gt;&gt;; }


</td><td markdown="1">


</td></tr>
</tbody></table>

**Returns:**

HasOneRepositoryFactory&lt;Target, ForeignKeyType&gt;