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--- lang: en title: 'API docs: repository.relationdefinitionbase' 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.relationdefinitionbase.html ---  [Home](./index.md) > [@loopback/repository](./repository.md) > [RelationDefinitionBase](./repository.relationdefinitionbase.md) ## RelationDefinitionBase interface Signature: ```typescript export interface RelationDefinitionBase ``` ## Properties | Property | Modifiers | 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)<[Entity](./repository.entity.md), typeof [Entity](./repository.entity.md)> | 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. |