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Documentation for LoopBack 4
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lang: en
title: 'API docs: repository.relationdefinitionbase.source'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.relationdefinitionbase.source.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [RelationDefinitionBase](./repository.relationdefinitionbase.md) > [source](./repository.relationdefinitionbase.source.md)
## RelationDefinitionBase.source property
The source model of this relation.
E.g. when a Customer has many Order instances, then Customer is the source.
<b>Signature:</b>
```typescript
source: typeof Entity;
```