@loopback/docs/site/apidocs/repository.constraindataobjects.md

Documentation for LoopBack 4

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title: 'API docs: repository.constraindataobjects'
keywords: LoopBack 4.0, LoopBack 4
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[Home](./index.md) &gt; [@loopback/repository](./repository.md) &gt; [constrainDataObjects](./repository.constraindataobjects.md)

## constrainDataObjects() function

A utility function which takes an array of model instance data and enforces constraint(s) on it

<b>Signature:</b>

```typescript
export declare function constrainDataObjects<T extends Entity>(originalData: DataObject<T>[], constraint: DataObject<T>): DataObject<T>[];
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  originalData | <code>DataObject&lt;T&gt;[]</code> | the array of model data to apply the constrain(s) to |
|  constraint | <code>DataObject&lt;T&gt;</code> | the constraint which is to be applied on the data objects |

<b>Returns:</b>

`DataObject<T>[]`

an array of the modified data with the constraint, otherwise the original instance data array