How to Parse Json dictonary in swift 4

Question

Hi I have a problem with this Json:

{
    "id": "libMovies",
    "jsonrpc": "2.0",
    "result": {
        "limits": {
            "end": 75,
            "start": 0,
            "total": 1228
        },
        "movies": [{
            "art": {
                "fanart": "myfanart",
                "poster": "myposter"
            },
            "file": "myfile",
            "label": "mylable",
            "movieid": mymovieid,
            "playcount": 0,
            "rating": myrating,
            "thumbnail": "mythumbnail"
        }]
    }
}

When I parse Json in swift 5 with this code

try! JSONDecoder().decode([MyMovie].self, from: data!)

I get this error

Fatal error: 'try!' expression unexpectedly raised an error: Swift.DecodingError.typeMismatch(Swift.Array, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array but found a dictionary instead.", underlyingError: nil)):

How can I solve this?

Please **read** the error message and the JSON. It starts with a `{` so it could not be an array. And be aware that you have to decode JSON always from the top, you cannot ignore the root object. — vadian, Feb 28 '20 at 10:51

PGDev · Accepted Answer · 2020-02-29T13:52:52.517

0

For the below JSON,

{"id":"libMovies","jsonrpc":"2.0","result":{"limits":{"end":75,"start":0,"total":1228},"movies":[{"art":{"fanart":"myfanart","poster":"myposter"},"file":"myfile","label":"mylable","movieid":"mymovieid","playcount":0,"rating":"myrating","thumbnail":"mythumbnail"}]}}

The Codable models that you need to use,

struct Root: Decodable {
    let id, jsonrpc: String
    let result: Result
}
struct Result: Decodable {
    let limits: Limits
    let movies: [Movie]
}

struct Limits: Decodable {
    let end, start, total: Int
}

struct Movie: Decodable {
    let art: Art
    let file, label, movieid: String
    let playcount: Int
    let rating, thumbnail: String
}
struct Art: Decodable {
    let fanart, poster: String
}

Parse the JSON data like so,

do {
    let response = try JSONDecoder().decode(Root.self, from: data)
    print(response.result.movies.map({"file: \($0.file), label: \($0.label)"}))
} catch {
    print(error)
}

Edit:

To save the movies separately, create a variable of type [Movie],

var movies = [Movie]()

Now, while parsing save the response.result.movies in the above created property,

do {
    let response = try JSONDecoder().decode(Root.self, from: data)
    print(response.result.movies.map({"file: \($0.file), label: \($0.label)"}))
    movies = response.result.movies
} catch {
    print(error)
}

edited Feb 29 '20 at 13:52

answered Feb 28 '20 at 10:54

PGDev

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How can I print only "file", "lable" values? – TheCesco88 Feb 28 '20 at 11:00
Use `print(response.result.movies.map({"file: \($0.file), label: \($0.label)"}))`. Updated the answer. – PGDev Feb 28 '20 at 11:02
Yes, but now I want to put response.result.movies in to a "listMovie". I tried with listMovie: [Result] -> listMovie.append[response.result] but not work. I get only first value – TheCesco88 Feb 28 '20 at 11:40
Because you need to make your list of type `Movie` and append `response.result.movies` – Savca Marin Feb 28 '20 at 12:11
I get this error " Cannot convert value of type '[Movie]' to expected argument type 'Movie' " – TheCesco88 Feb 28 '20 at 13:21
By making your list of type movie I meant it should be `[Movie]` – Savca Marin Feb 28 '20 at 13:42
@TheCesco88 Updated the answer. – PGDev Feb 29 '20 at 13:53

How to Parse Json dictonary in swift 4

1 Answers1