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BetterRest - init() deprecated

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Hello,

I'm following along with the Hacking with Swift: SwiftUI Edition and coding the calculateBedtime() method.

The book says to enter:

let model = SleepCalculator()

but this generates the following warning:

'init()' is deprecated: Use init(configuration:) instead and handle errors appropriately.

If I begin typing configuration and acept the autocompletion it generates:

let model = SleepCalculator(configuration: MLModelConfiguration)

but I've no idea what to provide!

Any help appreciated.

3      

Change the line let model = SleepCalculator() to

let model: SleepCalculator = {
    do {
        let config = MLModelConfiguration()
        return try SleepCalculator(configuration: config)
    } catch {
        print(error)
        fatalError("Couldn't create SleepCalculator")
    }
}()

If you want you can handle the errors more gracefully, this will just crash the app if an error is thrown in the creation of the calculator.

4      

The solution that buddy supplied doesn't work

3      

For the above solution, you need to import the CoreML library at the top of the file: import CoreML

Also, I am not a fan of immidiately invoked function expressions, so I would move the declaration of the model into the do/catch block like this:

do {
    let model: SleepCalculator = try SleepCalculator(configuration: MLModelConfiguration())
    let prediction = try model.prediction(wake: Double(hour + minute), estimatedSleep: sleepAmount, coffee: Double(coffeeAmount))

    // more code here
} catch {
    print(error)
    // something went wrong!
}

Hope this helps!

8      

Hope this helps, the following should work:

do {
    let model: SleepCalculator = try SleepCalculator(configuration: .init())
    let prediction = try model.prediction(wake: Double(hour + minute), estimatedSleep: sleepAmount, coffee: Double(coffeeAmount))

    // continue to process
} catch {
    // something went wrong!
}

3      

@ksbex  

Thanks @vardyb, I just used your method to remove the warning on my project.

3      

would it be better if make the model a private static constant property of the view struct?

private static let model: SleepCalculator = {
    do {
        return try SleepCalculator(configuration: .init())
    } catch {
        print(error)
        fatalError(String(localized: "Couldn't create SleepCalculator"))
    }
}()

3      

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