# init(fetchDescriptor:modelContainer:isolation:) Creates a new unsectioned observer with the given fetch descriptor and model container. ``` convenience init(fetchDescriptor: FetchDescriptor = FetchDescriptor(), modelContainer: ModelContainer, isolation: isolated (any Actor)? = #isolation) throws ``` ## Parameters `fetchDescriptor` The descriptor defining the fetch criteria. `modelContainer` The model container from which a new context will be created. ## Discussion A new `ModelContext` is created from the provided container. > 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)