SQLiteEncoder and SQLiteDecoder for Swift 4

[drewag]

I am working on creating a SQLiteEncoder and a SQLiteDecoder so that I can insert and retrieve objects from the database by simply implementing the Codable and Decodable protocols introduced in Swift 4. I originally implemented this outside of the library with my own Coding protocols and I am in the process of converting it to use Swift 4 Coding protocols instead of my custom ones. I was originally going to leave this outside of the framework but I discovered I will need internal access to some of the objects.

The Plan

• I do not plan to support relationships between objects or anything like that.
• The SQLiteEncoder will essentially just generate a list of setters for the encodable object. I will probably add a convenience insert method like insert<V: Encodable>(_ encodable: V) -> SQLite.Insert to QueryType that accepts an Encodable type and calls insert with the generated setters
• SQLiteDecoder will just do a series of gets on a provided row. I will probably add a method to Row like decode<V: Decodable>() throw -> V.
• The coders will simply convert all non-native types to and from JSON data

Is anyone already attempting this or think that this is an undesirable feature inside this framework?