---
title: "init(_:transaction:sectionBy:)"
framework: SwiftData
role: symbol
role_heading: Initializer
platforms: [iOS 27.0+, iPadOS 27.0+, Mac Catalyst 27.0+, macOS 27.0+, tvOS 27.0+, visionOS 27.0+, watchOS 27.0+]
path: "swiftdata/query/init(_:transaction:sectionby:)-8ecyq"
---

# init(_:transaction:sectionBy:)

Creates a sectioned query from a fetch descriptor, grouped by a required optional-String key path.

## Declaration

```swift
@MainActor @preconcurrency init(_ descriptor: FetchDescriptor<Element>, transaction: Transaction? = nil, sectionBy sectionKeyPath: KeyPath<Element, String?>) where Result == SectionedResults<Element, String>
```