# init(fetchDescriptor:modelContext:isolation:) Creates a new unsectioned observer with the given fetch descriptor and model context. ``` convenience init(fetchDescriptor: FetchDescriptor = FetchDescriptor(), modelContext: ModelContext, isolation: isolated (any Actor)? = #isolation) throws ``` ## Parameters `fetchDescriptor` The descriptor defining the fetch criteria. `modelContext` The model context to fetch from and observe for changes. ## Discussion> Throws: An error if the initial fetch fails. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)