Background Tasks
The viewContext of NSPersistentContainer is associated with the main queue. Because of this, any operations that take a long time will block the main queue, which can lead to an unresponsive application. To address this, it is often a good idea to do expensive operations on a background task. The insertion of photos from the web service is a good candidate for a background task.
You are going to update processPhotosRequest(data:error:) to use a background task. Background tasks are an asynchronous operation, so you will need to update the method signature to use a completion handler.
Open PhotoStore.swift and update processPhotosRequest(data:error:) to take in a completion handler. You will have some errors in the ...
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