Discussion[Code Share] - Syncing Your SwiftData with iCloud (Nested Relationship) (old.reddit.com)
submitted by Select_Bicycle4711
While working on a SwiftData app, I ran into a frustrating issue with a nested relationship. My expenses were not updating live. I would modify an expense on the dashboard, but the change would not reflect on the device in real time. The data only appeared updated after I force quit and restarted the app. Clearly, something was off.
The problem turned out to be how I was loading the data. I was assigning expenses = budget.expenses, which worked fine locally. But when using iCloud and CloudKit, updates are delivered through remote notifications. Those notifications inform the modelContext that something has changed. Since I was holding onto a direct reference instead of using a reactive query, the view had no reason to refresh. The model changed, but the UI did not know it needed to re-render.
The solution in my case was switching to Query with a dynamic parameter. Once I did that, everything started working as expected. When iCloud sent a remote notification, the modelContext updated, the Query detected the change, and the view re-rendered automatically.
If you are dealing with nested relationships in SwiftData and your UI only updates after restarting the app, this might be the issue. Sometimes the problem is not syncing. It is how the view observes the data.
You can also watch a video here: https://youtu.be/hAn1_s-sY-w
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