---
lang: en
title: 'API docs: repository.relationdefinitionbase'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
sidebar: lb4_sidebar
editurl: https://github.com/strongloop/loopback-next/tree/master/packages/repository
permalink: /doc/en/lb4/apidocs.repository.relationdefinitionbase.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [RelationDefinitionBase](./repository.relationdefinitionbase.md)

## RelationDefinitionBase interface

<b>Signature:</b>

```typescript
export interface RelationDefinitionBase 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [name](./repository.relationdefinitionbase.name.md) | string | The relation name, typically matching the name of the accessor property defined on the source model. For example "orders" or "customer". |
|  [source](./repository.relationdefinitionbase.source.md) | typeof [Entity](./repository.entity.md) | The source model of this relation.<!-- -->E.g. when a Customer has many Order instances, then Customer is the source. |
|  [target](./repository.relationdefinitionbase.target.md) | [TypeResolver](./repository.typeresolver.md)<!-- -->&lt;[Entity](./repository.entity.md)<!-- -->, typeof [Entity](./repository.entity.md)<!-- -->&gt; | The target model of this relation.<!-- -->E.g. when a Customer has many Order instances, then Order is the target. |
|  [targetsMany](./repository.relationdefinitionbase.targetsmany.md) | boolean | True for relations targeting multiple instances (e.g. HasMany), false for relations with a single target (e.g. BelongsTo, HasOne). This property is needed by OpenAPI/JSON Schema generator. |
|  [type](./repository.relationdefinitionbase.type.md) | [RelationType](./repository.relationtype.md) | The type of the relation, must be one of RelationType values. |