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Documentation for LoopBack 4
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lang: en
title: 'API docs: repository.hasmanythroughdefinition.keyfrom'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.hasmanythroughdefinition.keyfrom.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [HasManyThroughDefinition](./repository.hasmanythroughdefinition.md) > [keyFrom](./repository.hasmanythroughdefinition.keyfrom.md)
## HasManyThroughDefinition.keyFrom property
The foreign key in the source model, e.g. Customer\#id.
<b>Signature:</b>
```typescript
keyFrom: string;
```