I've synced the device's data to iCloud but my issue is more like asynchronous cumulative number problem. We knew the result would be wrong.
We know that to get the right answer that need to change from asynchronous to synchronous. I think of putting scripts on the CloudKit. But the server does not seem to support such an operation.
js160
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https://developer.apple.com/forums/content/attachment/346a2354-ce59-4fd9-aeb8-cfceeac6a5cc
I get this error report:
https://developer.apple.com/forums/content/attachment/346a2354-ce59-4fd9-aeb8-cfceeac6a5cc
This error does not occur on every call。
Let the lldb of Xcode that input 'po context.fetch(request)'. and I get the messages:
error: :8:15: error: cannot convert value of type 'NSFetchRequest' to expected argument type 'NSFetchRequest' context.fetch(request) ^ :8:15: note: arguments to generic parameter 'ResultType' ('ResultType' and 'any NSFetchRequestResult') are expected to be equal