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---
lang: en
title: 'API docs: repository.hasone'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/loopbackio/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.hasone.html
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/repository](./repository.md) > [hasOne](./repository.hasone.md)
## hasOne() function
<b>Signature:</b>
```typescript
export declare function hasOne<T extends Entity>(targetResolver: EntityResolver<T>, definition?: Partial<HasOneDefinition>): (decoratedTarget: object, key: string) => void;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| targetResolver | [EntityResolver](./repository.entityresolver.md)<!-- --><T> | |
| definition | Partial<[HasOneDefinition](./repository.hasonedefinition.md)<!-- -->> | |
<b>Returns:</b>
(decoratedTarget: object, key: string) => void