Struct with nested data using Decodable

Question

I am consuming an API in Swift 4 using Alamofire. I am using structs to create Models of the data I wish to consume within that response and am confirming to Decodable.

My response looks like so...

    {  
       "pagination":{  
          "per_page":50,
          "items":3909,
          "page":1,
          "urls":{  
             "last":"https://api.discogs.com/database/search?q=ed+rush&per_page=50&secret=foo&page=79&key=bar",
             "next":"https://api.discogs.com/database/search?q=ed+rush&per_page=50&secret=foo&page=2&key=bar"
          },
          "pages":79
       },
       "results": []
    }

My models looks as follows...

struct SearchResults: Decodable {
    let pagination: SearchPagination
    let results: [SearchResult]
}

struct SearchResult: Decodable {
    let type: String
}

struct SearchPagination: Decodable {
    let per_page: Int
    let items: Int
    let page: Int
    let pages: Int
}

What I am trying to understand is how I would model pagination as urls is a nested object itself. Do I create a struct just for urls or am I missing something obvious here?

Perhaps a struct is not the best approach? I am coming from a JS background and structs feel very much like an interface in TypeScript however I am aware I may be missing something here.

You should create a struct for urls.

Mukesh
– Mukesh

2018-05-14 06:35:55 +00:00
Commented May 14, 2018 at 6:35 — Mukesh
– Mukesh, Commented May 14, 2018 at 6:35

vadian · Accepted Answer · 2018-05-14 06:36:21Z

2

The "rule" of Decodable is that any dictionary {} becomes a struct / class and each key becomes a property.

struct SearchPagination: Decodable {
    let per_page: Int
    let items: Int
    let page: Int
    let pages: Int
    let urls: URLData
}

struct URLData: Decodable {
    let last, next : URL
}

answered May 14, 2018 at 6:36

vadian

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