[swift-evolution] Feedback on SE-0166 and SE-0167

[David Hart]

> On 27 May 2017, at 12:40, Gwendal Roué <gwendal.roue at gmail.com> wrote:
> 
> 
>> Le 27 mai 2017 à 11:59, David Hart <david at hartbit.com <mailto:david at hartbit.com>> a écrit :
>> 
>> I didn’t know that was possible either! Really cool. Even better:
>> 
>>  if let databaseValueType = T.self as? DatabaseValueConvertible.Type {
>>      let databaseValue: DatabaseValue = row.value(named: key.stringValue)
>>      return databaseValueType.fromDatabaseValue(databaseValue) as! T
>>  } else { … }
> 
> 
> Yes, that's even more clear like that :-)
> 
> And for Encodable support, it works just great (not a single line of boilerplate code):
> 
>     private enum Color: String, DatabaseValueConvertible, Encodable {
>         case red, green, blue
>     }
>     
>     private struct EncodableStruct : Persistable, Encodable {
>         static let databaseTableName = "myTable"
>         let name: String
>         let color: Color?
>     }
>     
>     try dbQueue.inDatabase { db in
>         try EncodableStruct(name: "Arthur", color: .red).insert(db)
>     }
> 
> Gwendal
> 

As a user of GRDB: 😍
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