how can i do manual @Observable tracking

To manually track changes using @Observable in Swift, you can leverage the SwiftData history feature. This feature allows you to efficiently track changes in your data store over time. Here’s a brief overview of how you can do this:

1. Introduction to SwiftData History:

   • SwiftData history lets your app query and process changes in the order they occurred each time your model is saved. It records a transaction containing metadata about all the changes.
   • Transactions group together all changes that occurred in the data store on a boundary, such as a model context save. Each change represents a model that has been inserted, updated, or deleted.

2. Using SwiftData History:

   • You can query the data in the store at any time. However, without history or manual diffing, there's no way to know from a query which models may have been added, deleted, or updated since a previous one.
   • SwiftData history provides an easy and efficient way to track these changes. For example, you may want to have a time-ordered log of changes that occur when the app is offline. Later, these changes can be efficiently synced with a remote server.

For more detailed information, you can refer to the session Track model changes with SwiftData history.

Relevant Sessions

• Track model changes with SwiftData history

If you need more specific details or examples, please let me know!