JSON array inside of an array

Question

I am looking to access a string that is located inside of a JSON array that is located inside of another array. I am accessing the JSON API using JSONDecoder. I am receiving errors when trying the various methods that I have used in the past when using JSON arrays.

Here is the code:

var country = [Results]()

struct Rating: Codable {
    let results: [Results]
}

struct Results: Codable {
    let iso_3166_1: String
    let release_dates: [Release_Dates]
}

struct Release_Dates: Codable {
    let certification: String
}


func loadRating() {

    let id = filmId
    let apiKey = ""
    let url = URL(string: "https://api.themoviedb.org/3/movie/\(id)/release_dates?api_key=\(apiKey)")
    let request = URLRequest(
        url: url! as URL,
        cachePolicy: URLRequest.CachePolicy.reloadIgnoringLocalCacheData,
        timeoutInterval: 10 )

    let session = URLSession (
        configuration: URLSessionConfiguration.default,
        delegate: nil,
        delegateQueue: OperationQueue.main
    )

    let task = session.dataTask(with: request, completionHandler: { (dataOrNil, response, error) in
        if let data = dataOrNil {
            do { let rates = try! JSONDecoder().decode(Rating.self, from: data)
               self.country = rates.results
                let us = self.country.filter({ $0.iso_3166_1.contains("US") })
                print(us)


        }
        }

    })

    task.resume()
}

us prints to console

[Film.DetailsView.Results(iso_3166_1: "US", release_dates: [Film.DetailsView.Release_Dates(certification: "PG-13")])]

I am trying to access the certification string.

What would be the correct method used to achieve this?

ielyamani · Accepted Answer · 2018-10-12 17:57:01Z

1

us is an array of Results.

To get the first certification use this:

print(us.first!.release_dates.first!. certification)

I am force unwrapping for brevity, you should properly do it with optional binding or the guard statement.

answered Oct 12, 2018 at 17:57

ielyamani

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Comments

vadian · Accepted Answer · 2018-10-12 18:06:44Z

1

Pretty straightforward, the result of filter is an array and certification is in the array release_dates

let us = self.country.filter({ $0.iso_3166_1.contains("US") })
for item in us {
    for releaseDate in item.release_dates {
       print(releaseDate.certification)
    }
}

Please name your struct member names lowerCamelCased by mapping the keys with CodingKeys or with the convertFromSnakeCase strategy.

If there is only one US item, use first

if let us = self.country.first({ $0.iso_3166_1.contains("US") }) {
    for releaseDate in us.release_dates {
       print(releaseDate.certification)
    }
}

edited Oct 12, 2018 at 18:06

answered Oct 12, 2018 at 17:59

vadian

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