@loopback/docs/site/apidocs/repository.createbelongstoaccessor.md

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---
lang: en
title: 'API docs: repository.createbelongstoaccessor'
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.createbelongstoaccessor.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [createBelongsToAccessor](./repository.createbelongstoaccessor.md)

## createBelongsToAccessor() function

Enforces a BelongsTo constraint on a repository If the target model is polymorphic, i.e. stored within different repositories, supply the targetRepositoryGetter with a dictionary in the form of {<!-- -->\[typeName: string\]: repositoryGetter<!-- -->}

**Signature:**

```typescript
export declare function createBelongsToAccessor<Target extends Entity, TargetId, Source extends Entity, SourceId>(belongsToMetadata: BelongsToDefinition, targetRepositoryGetter: Getter<EntityCrudRepository<Target, TargetId>> | {
    [repoType: string]: Getter<EntityCrudRepository<Target, TargetId>>;
}, sourceRepository: EntityCrudRepository<Source, SourceId>): BelongsToAccessor<Target, SourceId>;
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  belongsToMetadata | [BelongsToDefinition](./repository.belongstodefinition.md) |  |
|  targetRepositoryGetter | Getter&lt;[EntityCrudRepository](./repository.entitycrudrepository.md)<!-- -->&lt;Target, TargetId&gt;&gt; \| { \[repoType: string\]: Getter&lt;[EntityCrudRepository](./repository.entitycrudrepository.md)<!-- -->&lt;Target, TargetId&gt;&gt;; } |  |
|  sourceRepository | [EntityCrudRepository](./repository.entitycrudrepository.md)<!-- -->&lt;Source, SourceId&gt; |  |

**Returns:**

[BelongsToAccessor](./repository.belongstoaccessor.md)<!-- -->&lt;Target, SourceId&gt;