---
lang: en
title: 'API docs: repository.entity'
keywords: LoopBack 4.0, LoopBack 4
sidebar: lb4_sidebar
permalink: /doc/en/lb4/apidocs.repository.entity.html
---

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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [Entity](./repository.entity.md)

## Entity class

Base class for entities which have unique ids

<b>Signature:</b>

```typescript
export declare abstract class Entity extends Model implements Persistable 
```

## Methods

|  Method | Modifiers | Description |
|  --- | --- | --- |
|  [buildWhereForId(id)](./repository.entity.buildwhereforid.md) | <code>static</code> | Build the where object for the given id |
|  [getId()](./repository.entity.getid.md) |  | Get the identity value. If the identity is a composite key, returns an object. |
|  [getIdObject()](./repository.entity.getidobject.md) |  | Get the identity as an object, such as <code>{id: 1}</code> or <code>{schoolId: 1, studentId: 2}</code> |
|  [getIdOf(entityOrData)](./repository.entity.getidof.md) | <code>static</code> | Get the identity value for a given entity instance or entity data object. |
|  [getIdProperties()](./repository.entity.getidproperties.md) | <code>static</code> | Get the names of identity properties (primary keys). |


