# init(for:) Creates an identifier for the specified entity. ``` init(for entity: Entity) where Entity : AppEntity ``` ## Parameters `entity` The entity for which to create an identifier ## Discussion For entities adopting `_SyncableEntity`, this initializer extracts the stable ID: - **Passthrough case**: If the entity’s ID is already stable (like `UUID`), it’s used as both local and stable ID - **Mapped case**: If the entity’s ID uses `_SyncableEntityIdentifier`, the stable ID is extracted from the wrapper - **Custom identifier case**: If the entity’s ID conforms to `_SyncableEntityIdentifierProviding`, the stable ID is extracted via `stableIdentifierString` The stable ID is used for cross-device entity resolution via Campo session syncing. --- 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)