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Documentation for LoopBack 4
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lang: en
title: 'API docs: repository.modeldefinition.addrelation'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.modeldefinition.addrelation.html
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[Home](./index.md) > [@loopback/repository](./repository.md) > [ModelDefinition](./repository.modeldefinition.md) > [addRelation](./repository.modeldefinition.addrelation.md)
## ModelDefinition.addRelation() method
Define a new relation.
<b>Signature:</b>
```typescript
addRelation(definition: RelationMetadata): this;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| definition | <code>RelationMetadata</code> | The definition of the new relation. |
<b>Returns:</b>
`this`