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Documentation for LoopBack 4
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---
lang: en
title: 'API docs: repository.defaultcrudrepository.ensurepersistable'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.defaultcrudrepository.ensurepersistable.html
---
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[Home](./index.md) > [@loopback/repository](./repository.md) > [DefaultCrudRepository](./repository.defaultcrudrepository.md) > [ensurePersistable](./repository.defaultcrudrepository.ensurepersistable.md)
## DefaultCrudRepository.ensurePersistable() method
Converts an entity object to a JSON object to check if it contains navigational property. Throws an error if `entity` contains navigational property.
<b>Signature:</b>
```typescript
protected ensurePersistable<R extends T>(entity: R | DataObject<R>, options?: {}): legacy.ModelData<legacy.PersistedModel>;
```
## Parameters
| Parameter | Type | Description |
| --- | --- | --- |
| entity | <code>R | DataObject<R></code> | |
| options | <code>{}</code> | |
<b>Returns:</b>
`legacy.ModelData<legacy.PersistedModel>`