Feature: mappable meta

[vadymmarkov]

@zenangst
Got a new idea regarding our discussions about meta. So instead of using enums or magic generators we can use Mappable structs 😄

struct ProductMeta {
  var id = 0
  var name: String?
}

extension ProductMeta: Mappable {
  init(_ map: JSONDictionary) {
    id <- map.property("id")
    name <- map.property("name")
  }
}

let productMeta = ProductMeta(id: 11, name: "Name")
let viewModel = ViewModel(title: "Title", meta: productMeta)
// ...
let meta: ProductMeta = viewModel.metaInstance()
print(meta.id) // => 11

My only concern is than it might be too much code, because you have to implement mapping, don't see any way to avoid this, even though property key always reflects the property name. But with this approach you write string only once which is nice.

[zenangst]

@vadymmarkov what about the README? 😁
Btw, this is bloody fantastic...

[onmyway133]

@vadymmarkov 🎉

My wonder is about this let viewModel = ViewModel(title: "Title", meta: productMeta)
What if title also goes into ProductMeta? So there is no ViewModel anymore?

[vadymmarkov]

This is interesting idea @onmyway133. What do you think @zenangst? It could be some additional protocol, so you should have title, subtitle, kind and so on on your struct. But it's Mappable at the same time.

[zenangst]

I like this idea! 😁