Create a particular JSON Structure in Swift

Question

I'm having trouble creating a specific structure in JSON with Swift. I use Swifty JSON for parsing but I can't figure out how to create one.

I have this array which is filled by Id's and quantity Ints of products in a shopping basket . I need to get the array into my JSON but I don't know how.

If you could help me with this I would be very glad :)

    var productArray = Array<(id: Int,quantity: Int)>()

    let jsonObject: [String: AnyObject] = [
        "order": 1,
        "client" : 1,
        "plats": [
            for product in productArray
            {
            "id": product.id
            "quantity": product.quantity
            }
        ]
    ]

Nope, just "Expected expression in container literal" at the for line, I can't figure out how to do this — Dinosan0908
– Dinosan0908, Commented May 21, 2015 at 14:04
You've got a for loop [ and ], that's definitely not allowed. What did you want the value of they plats key to be? — ABakerSmith
– ABakerSmith, Commented May 21, 2015 at 14:12
I want to have "plats" who looks like puu.sh/hVinh/39d4e4e11c.png ! You know like an Array inside — Dinosan0908
– Dinosan0908, Commented May 21, 2015 at 14:14

Aaron Brager · Accepted Answer · 2015-05-21 14:14:12Z

1

You can't just start looping through stuff while defining your dictionary. Here's another approach.

First, create your array:

var productArray = Array<(id: Int,quantity: Int)>()

Add some products (for testing):

productArray += [(123, 1000)]
productArray += [(456, 50)]

Map this array into a new array of dictionaries:

let productDictArray = productArray.map { (product) -> [String : Int] in
    [
        "id": product.id,
        "quantity": product.quantity
    ]
}

Use the new mapped array in your JSON object:

let jsonObject: [String: AnyObject] = [
    "order": 1,
    "client" : 1,
    "plats": productDictArray
]

answered May 21, 2015 at 14:14

Aaron Brager

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Comments

Amit89 · Accepted Answer · 2015-05-21 16:32:02Z

1

You are not supposed to do any kind of looping/condition making block of codes while creating Array's or Dictionary. For that you need to execute that piece of code outside, create a variable and use it.

Do try this way.

var productArray = Array<(id: Int,quantity: Int)>()

    var prods = [[String:Int]]()
    for product in productArray
    {
        var eachDict = [String:Int]()
        eachDict["id"] =  product.id
        eachDict["quantity"] = product.quantity
        prods.append(eachDict)
    }

    let jsonObject: [String: AnyObject] = [
        "order": 1,
        "client" : 1,
        "plats": prods
    ]

edited May 21, 2015 at 16:32

answered May 21, 2015 at 14:13

Amit89

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