# Custom Attribute Functions

{% hint style="warning" %}

## Project Toolchain Usage

This feature makes use of these Project Toolchain APIs: **Middleware**, **Extensions**. Because of this usage, it defines the following modules:

### customAttributeFunctions

This module defines the following middleware and extensions identifiers that can be imported via Project Toolchain, along with their descriptions:

* **attributeFunctions** - Remove empty OR blocks from queries.
  {% endhint %}

To enable this optional feature, add the `customAttributeFunctions` element to your [optionalFeatures](https://prisma-util.gitbook.io/stable/api-documentation/configuration-reference/optional-features) array, then use the generated middleware or extension inside of your code.

## Feature Effect

Whenever you attempt a create operation on a model, all fields that have a default function defined in the [defaultFunctions](https://prisma-util.gitbook.io/stable/api-documentation/configuration-reference/default-functions) configuration property will have their value set to the result of those functions.


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