SwiftUI - how to update a list of child object after an edit.

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Created Jul ’21

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I have parent-child relationship in Core Data, and I'm using SwiftUI to display the results. When editing a child attribute, after saving to Core Data, the SwiftUI List does not update with the information. When adding a child object, it works, but not when editing the child object.

The issue is explained and demonstrated in this repository: https://github.com/jsagorin/ios-swiftui-core-data-parent-child

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Answer 1

deeje OP

Jul ’21

This sounds related to the current issue that support for DiffableDataSource in FetchedResultsController doesn't handle updates, only inserts, deletes, and moves. FetchedResultsController is the backbone of @FetchRequest in SwiftUI. See https://www.avanderlee.com/swift/diffable-data-sources-core-data/ for a good discussion of the issue.

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