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Documentation for LoopBack 4
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---
lang: en
title: 'API docs: repository.schemamigrationoptions'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.schemamigrationoptions.html
---
<!-- Do not edit this file. It is automatically generated by API Documenter. -->
[Home](./index.md) > [@loopback/repository](./repository.md) > [SchemaMigrationOptions](./repository.schemamigrationoptions.md)
## SchemaMigrationOptions interface
<b>Signature:</b>
```typescript
export interface SchemaMigrationOptions extends Options
```
## Properties
| Property | Type | Description |
| --- | --- | --- |
| [existingSchema](./repository.schemamigrationoptions.existingschema.md) | <code>'drop' | 'alter'</code> | When set to 'drop', schema migration will drop existing tables and recreate them from scratch, removing any existing data along the way.<!-- -->When set to 'alter', schema migration will try to preserve current schema and data, and perform a non-destructive incremental update. |
| [models](./repository.schemamigrationoptions.models.md) | <code>string[]</code> | List of model names to migrate.<!-- -->By default, all models are migrated. |