How to: Using Combine to react to CoreData changes in the background

Question

I want to achieve the following: Whenever someone triggers a CoreData save (ie. NSManagedObjectContextDidSave notification gets sent), I\'d like to perform some

Answer 1

You can pass the object you want to observe to publisher(for:):

NotificationCenter.default
  .publisher(for: .NSManagedObjectContextDidSave, object: backgroundMoc)
  .sink(receiveValue: { notification in
    // handle changes
  })

That will only listen for notifications related to a background managed object context which means you can do processing on that context's queue safely.