@loopback/docs/site/apidocs/sequelize.sequelizecrudrepository.createhasmanythroughrepositoryfactoryfor.md

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---
lang: en
title: 'API docs: sequelize.sequelizecrudrepository.createhasmanythroughrepositoryfactoryfor'
keywords: LoopBack 4.0, LoopBack 4, Node.js, TypeScript, OpenAPI
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[Home](./index.md) &gt; [@loopback/sequelize](./sequelize.md) &gt; [SequelizeCrudRepository](./sequelize.sequelizecrudrepository.md) &gt; [createHasManyThroughRepositoryFactoryFor](./sequelize.sequelizecrudrepository.createhasmanythroughrepositoryfactoryfor.md)

## SequelizeCrudRepository.createHasManyThroughRepositoryFactoryFor() method

Function to create a constrained hasManyThrough relation repository factory

**Signature:**

```typescript
protected createHasManyThroughRepositoryFactoryFor<Target extends Entity, TargetID, Through extends Entity, ThroughID, ForeignKeyType>(relationName: string, targetRepositoryGetter: Getter<EntityCrudRepository<Target, TargetID>> | {
        [repoType: string]: Getter<EntityCrudRepository<Target, TargetID>>;
    }, throughRepositoryGetter: Getter<EntityCrudRepository<Through, ThroughID>>): HasManyThroughRepositoryFactory<Target, TargetID, Through, ForeignKeyType>;
```

## Parameters

<table><thead><tr><th>

Parameter


</th><th>

Type


</th><th>

Description


</th></tr></thead>
<tbody><tr><td markdown="1">

relationName


</td><td markdown="1">

string


</td><td markdown="1">

Name of the relation defined on the source model


</td></tr>
<tr><td markdown="1">

targetRepositoryGetter


</td><td markdown="1">

Getter&lt;EntityCrudRepository&lt;Target, TargetID&gt;&gt; \| { \[repoType: string\]: Getter&lt;EntityCrudRepository&lt;Target, TargetID&gt;&gt;; }


</td><td markdown="1">


</td></tr>
<tr><td markdown="1">

throughRepositoryGetter


</td><td markdown="1">

Getter&lt;EntityCrudRepository&lt;Through, ThroughID&gt;&gt;


</td><td markdown="1">


</td></tr>
</tbody></table>

**Returns:**

HasManyThroughRepositoryFactory&lt;Target, TargetID, Through, ForeignKeyType&gt;

## Example


```ts
class CustomerRepository extends SequelizeCrudRepository<
  Customer,
  typeof Customer.prototype.id,
  CustomerRelations
> {
  public readonly cartItems: HasManyRepositoryFactory<CartItem, typeof Customer.prototype.id>;

  constructor(
    protected db: SequelizeDataSource,
    cartItemRepository: EntityCrudRepository<CartItem, typeof, CartItem.prototype.id>,
    throughRepository: EntityCrudRepository<Through, typeof Through.prototype.id>,
  ) {
    super(Customer, db);
    this.cartItems = this.createHasManyThroughRepositoryFactoryFor(
      'cartItems',
      cartItemRepository,
    );
  }
}
```