---
url: >-
  https://canary.warp-drive.io/api/@warp-drive/legacy/serializer/transform/classes/NumberTransform.md
description: >-
  Legacy transform for `attr('number')` that converts payload values to numbers,
  or `null` when empty or not a valid number.
---

 

#  NumberTransform

Defined in: [warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts:10](https://github.com/warp-drive-data/warp-drive/blob/48dc0d277b98008082669dadc6a52e5c5682ef8e/warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts#L10)

The `NumberTransform` class is used to serialize and deserialize
numeric attributes on Ember Data record objects. This transform is
used when `number` is passed as the type parameter to the
[attr](../../../model/functions/attr.md) function.

Usage

```js [app/models/score.js]
import Model, { attr, belongsTo } from '@warp-drive/legacy/model';

export default class ScoreModel extends Model {
  @attr('number') value;
  @belongsTo('player') player;
  @attr('date') date;
}
```

## Constructors

### Constructor

```ts
new NumberTransform(): NumberTransform;
```

#### Returns

`NumberTransform`

## Methods

### deserialize()

```ts
deserialize(serialized: string | number | null | undefined, _options?: Record<string, unknown>): number | null;
```

Defined in: [warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts:44](https://github.com/warp-drive-data/warp-drive/blob/48dc0d277b98008082669dadc6a52e5c5682ef8e/warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts#L44)

Converts a serialized (raw payload) value into a `number`, or `null`
if the value is empty, nullish, or not a valid number.

#### Parameters

##### serialized

`string` | `number` | `null` | `undefined`

##### \_options?

[`Record`](https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type)<`string`, `unknown`>

#### Returns

`number` | `null`

***

### serialize()

```ts
serialize(deserialized: string | number | null | undefined, _options?: Record<string, unknown>): number | null;
```

Defined in: [warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts:57](https://github.com/warp-drive-data/warp-drive/blob/48dc0d277b98008082669dadc6a52e5c5682ef8e/warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts#L57)

Converts a `number` attribute value into its serialized (raw payload) form.

#### Parameters

##### deserialized

`string` | `number` | `null` | `undefined`

##### \_options?

[`Record`](https://www.typescriptlang.org/docs/handbook/utility-types.html#recordkeys-type)<`string`, `unknown`>

#### Returns

`number` | `null`

***

### create()

```ts
static create(): NumberTransform;
```

Defined in: [warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts:70](https://github.com/warp-drive-data/warp-drive/blob/48dc0d277b98008082669dadc6a52e5c5682ef8e/warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts#L70)

Creates a new instance of this transform.

#### Returns

`NumberTransform`

## Properties

### \_\_\_(unique) Symbol($type)

```ts
___(unique) Symbol($type): "number";
```

Defined in: [warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts:14](https://github.com/warp-drive-data/warp-drive/blob/48dc0d277b98008082669dadc6a52e5c5682ef8e/warp-drive-packages/legacy/src/serializer/-private/transforms/number.ts#L14)

see [TransformName](../../../../core/types/symbols/variables/TransformName.md)