Does Decodable only work with structs?

[kylebshr]

I'm trying to use Decodable to create Realm objects, but I'm having issues. Then I realized all the examples were structs — does Decodable not work with classes?

[Anviking]

It wasn't designed for it, but yes it should work. Some problems though:

• You must return Self. Might be cumbersome sometimes.
• I believe you still can't exit (e.g throw) a class's init-method before all variables are initialized.

The latter should not be a problem though if you have default values on your Realm object.

Have you seen the NSDate-example?

public class func decode(json: AnyObject) throws -> Self {
        let string = try String.decode(json)

        guard let date = ISO8601DateFormatter.dateFromString(string) else {
            throw NSDateDecodingError.InvalidStringFormat
        }

        return self.init(timeIntervalSince1970: date.timeIntervalSince1970)
}

[kylebshr]

With the NSDate example — if I needed multiple properties, I would have to decode them all, right?

Here's what I have set up right now, and it's obviously not working. Am I just completely wrong about how it can be used? My knowledge of protocols and the way types work here is not very strong.

[Anviking]

What if you do return try self.init instead of return try Test?

[kylebshr]

No luck :(

[Anviking]

And if you also make the initializer required?

[kylebshr]

Oh wow, I didn't know you could do that — I should read up on my initializers. This seems like it should work great, thank you! Do you see any possible drawbacks or issues doing this?

[Anviking]

I guess it might be bad if you subclass a lot. Perhaps this is a little bit better:

[kylebshr]

Much better, almost half the code. Thank you!

Sent from my iPhone

On Oct 1, 2015, at 4:36 PM, Johannes Lund notifications@github.com wrote:

I guess it might be bad if you subclass a lot. Perhaps this is a little bit better:

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