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Core Data Error Checking

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Being a newbie to Swift/SwiftUI I am struggling to understand how to error check core data. I have searched the internet and haven't found anything on how to do this. I am a visual learner and I enjoy all the videos Paul @twostraws puts out that shows me how to implement Swift and SwiftUI.

When you create a new project in SwiftUI 2.0 you get this in the Persistence.swift file:

container.loadPersistentStores(completionHandler: { (storeDescription, error) in
        if let error = error as NSError? {
            // Replace this implementation with code to handle the error appropriately.
            // fatalError() causes the application to generate a crash log and terminate. You should not use this function in a shipping application, although it may be useful during development.

            /*
            Typical reasons for an error here include:
            * The parent directory does not exist, cannot be created, or disallows writing.
            * The persistent store is not accessible, due to permissions or data protection when the device is locked.
            * The device is out of space.
            * The store could not be migrated to the current model version.
            Check the error message to determine what the actual problem was.
            */
            fatalError("Unresolved error \(error), \(error.userInfo)")
        }
})
  1. My question is how do we check for these types of errors?

  2. How do we error check when performing our do/try catch blocks. I see fatalerror always being used but I'm told we shouldn't use it.

Apologize for the newbie questions, I am sure its quite basic, but its not obvious to me. So any help here would be greatly appeciated.

Thanks, Mark

   

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