Using JSON Arrays in swift

Question

I am having problems accessing information that is stored inside of a JSON API whenever it is located inside of [] brackets rather than {} brackets. I am trying to search through the array and find the {} set that matches "job": "director". Problem is if I'm not using an IndexPath view such as a CollectionView I cannot access information located inside of the [] brackets.

JSON:

"crew": [
{
  "credit_id": "57ea3a02c3a3687edc00080a",
  "department": "Directing",
  "gender": 2,
  "id": 51329,
  "job": "Director",
  "name": "Bradley Cooper",
  "profile_path": "/z5LUl9bljJnah3S5rtN7rScrmI8.jpg"
},
{
  "credit_id": "57ea3a14c3a3687ff9007bd7",
  "department": "Writing",
  "gender": 2,
  "id": 51329,
  "job": "Screenplay",
  "name": "Bradley Cooper",
  "profile_path": "/z5LUl9bljJnah3S5rtN7rScrmI8.jpg"
},
{
  "credit_id": "57ea3a27925141108f008807",
  "department": "Writing",
  "gender": 2,
  "id": 224385,
  "job": "Screenplay",
  "name": "Will Fetters",
  "profile_path": null
}
],

Here is part of my code:

struct Cast: Codable {
    let character: String
    let name: String
    let profile_path: String?
}

struct Crew: Codable {
    let name: String
    let profile_path: String?
    let job: String
}

func loadCredits() {

    let id = filmId
    let apiKey = ""
    let url = URL(string: "https://api.themoviedb.org/3/movie/\(id)/credits?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 credit = try! JSONDecoder().decode(Credits.self, from: data)
                self.filmCast = credit.cast
                self.filmCrew = credit.crew


                self.castCollection.reloadData()

            }
        }

        self.castCollection.reloadData()

    })

    task.resume()
}

I can use this to access the information through an indexpath as such:

func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {

    let cell = castCollection.dequeueReusableCell(withReuseIdentifier: "castCell", for: indexPath) as! CastCell

        let credit = filmCast[indexPath.row]
        let name = credit.name

        cell.castName.text = name


        return cell


}

But I am having trouble searching through the data without it being located in an IndexPath view such as UICollectionView.

So if I want to search for the job that is Director outside of the collectionview I am trying:

if filmCrew.job == "Director" {
 perform action here
  }

I am receiving the error:

Value of type '[DetailsView.Crew]' has no member 'job'

So the question I have is how to properly search through a JSON array to find the matching {} of data based on the matching value. Sorry if the question sounds dumb or confusing, I've just had problems with this since using dictionaries and arrays. It always works fine when I index it in table and collection views but I can't seem to figure out how to sift through the array.

Craig Siemens · Accepted Answer · 2018-10-12 15:18:30Z

3

Your condition needs to go through the whole filmCrew array and find the first user that that has the job "Director", luckily there's a method that does it.

if let director = filmCrew.first(where: { $0.job == "Director" }) {
    //perform action here
}

answered Oct 12, 2018 at 15:18

Craig Siemens

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2 Comments

JSharpp Over a year ago

This worked, thanks! Now if I was trying to access every instance that the job was screenplay would I use contains rather than first?

Craig Siemens Over a year ago

contains will just tell you if there is at least one instance that has the job of screenplay. You probably want filter which will filter the array and return a new one the just contains all the users with the job of screenplay.

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