---
lang: en
title: 'API docs: repository.hasmanydefinition.keyto'
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.hasmanydefinition.keyto.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [HasManyDefinition](./repository.hasmanydefinition.md) &gt; [keyTo](./repository.hasmanydefinition.keyto.md)

## HasManyDefinition.keyTo property

keyTo: The foreign key used by the target model for this relation. keyFrom: The source key used by the source model for this relation.

E.g. when a Customer has many Order instances, then keyTo is "customerId". Note that "customerId" is the default FK assumed by the framework, users can provide a custom FK name by setting "keyTo". And Customer.id is keyFrom. keyFrom defaults to the id property of a model. Users can provide a custom source key name by setting "keyTo".

**Signature:**

```typescript
keyTo?: string;
```