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

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [HasManyThroughDefinition](./repository.hasmanythroughdefinition.md)

## HasManyThroughDefinition interface

A `hasManyThrough` relation defines a many-to-many connection with another model. This relation indicates that the declaring model can be matched with zero or more instances of another model by proceeding through a third model.

Warning: The hasManyThrough interface is experimental and is subject to change. If backwards-incompatible changes are made, a new major version may not be released.

<b>Signature:</b>

```typescript
export interface HasManyThroughDefinition extends RelationDefinitionBase 
```

## Properties

|  Property | Type | Description |
|  --- | --- | --- |
|  [keyFrom](./repository.hasmanythroughdefinition.keyfrom.md) | <code>string</code> | The foreign key in the source model, e.g. Customer\#id. |
|  [keyTo](./repository.hasmanythroughdefinition.keyto.md) | <code>string</code> | The primary key of the target model, e.g Seller\#id. |
|  [targetsMany](./repository.hasmanythroughdefinition.targetsmany.md) | <code>true</code> |  |
|  [through](./repository.hasmanythroughdefinition.through.md) | <code>{</code><br/><code>        model: TypeResolver&lt;Entity, typeof Entity&gt;;</code><br/><code>        keyFrom: string;</code><br/><code>        keyTo: string;</code><br/><code>    }</code> |  |
|  [type](./repository.hasmanythroughdefinition.type.md) | <code>RelationType.hasMany</code> |  |