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---
lang: en
title: 'API docs: repository.defaultbelongstorepository._constructor_'
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.defaultbelongstorepository._constructor_.html
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/repository](./repository.md) > [DefaultBelongsToRepository](./repository.defaultbelongstorepository.md) > [(constructor)](./repository.defaultbelongstorepository._constructor_.md)
## DefaultBelongsToRepository.(constructor)
Constructor of DefaultBelongsToEntityCrudRepository
**Signature:**
```typescript
constructor(getTargetRepository: Getter<TargetRepository> | {
[repoType: string]: Getter<TargetRepository>;
}, constraint: DataObject<TargetEntity>, targetResolver: TypeResolver<Entity, typeof Entity>);
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| getTargetRepository | Getter<TargetRepository> \| { \[repoType: string\]: Getter<TargetRepository>; } | either a dictionary of target model type - target repository instance or a single target repository instance e.g. if the target is of a non-polymorphic type "Student", put the studentRepositoryGetterInstance if the target is of a polymorphic type "Person" which can be either a "Student" or a "Teacher" then put "<!-- -->{<!-- -->Student: studentRepositoryGetterInstance, Teacher: teacherRepositoryGetterInstance<!-- -->}<!-- -->" |
| constraint | [DataObject](./repository.dataobject.md)<!-- --><TargetEntity> | the key value pair representing foreign key name to constrain the target repository instance |
| targetResolver | [TypeResolver](./repository.typeresolver.md)<!-- --><[Entity](./repository.entity.md)<!-- -->, typeof [Entity](./repository.entity.md)<!-- -->> | () =<!-- -->> Target to resolve the target class e.g. if the target is of type "Student", then put "() =<!-- -->> Student" |