How to create a dictionary with 2 arrays inside?

Question

I want to create a dictionary with the next structure, for sending it via Alamofire as JSON to a server:

{
    "user": {
        "firstName": "fName",
         "lastName": null,
         "img": null,
         "books": [
             {
                 "id": 1
             }, {
                 "id": 2
             }
         ]
    },

    "locale": "en",
    "gender": "male"
}

For this structure of JSON, I've tried the next:

let parameters: [[String: [String: String]], [String: String]]

but there a lot closures, so I confused with it. Can you help me with creating this structure?

I think it looks like http://stackoverflow.com/questions/31793155/alamofire-sending-json-as-request-parameter — Bhavin Bhadani, Mar 17 '16 at 11:46

score 1 · Accepted Answer · answered Mar 17 '16 at 11:47

1

The collection types in the Swift standard library only support homogenous collections, i.e. all elements in a collection must have the same type. So you cannot declare an array whose first element is of type [String: [String: String]] and whose second element is of type [String: String] if that is what you wanted.

This works:

let parameters = [
    "user": [
        "firstName": "fName",
        "lastName": NSNull(),
        "img": NSNull(),
        "books": [
            [ "id": 1],
            [ "id": 2]
        ]
    ],
    "locale": "en",
    "gender": "male"
]

The type of parameters is [String: NSObject] where NSObject is the superclass of all the values in the dictionary. Note the use of NSNull to model null values, which is what NSJSONSerialization expects.

answered Mar 17 '16 at 11:47

Ole Begemann

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Alamofire requires `AnyObject`, there's no need to force `NSObject`. – redent84 Mar 17 '16 at 12:36
True, but the type inferred by the compiler is `[String: NSObject]`. – Ole Begemann Mar 17 '16 at 13:26
it prints my `NSNull()` as `email = "";` is it okay? It's like a string here – John Doe Mar 17 '16 at 14:34

How to create a dictionary with 2 arrays inside?

1 Answers1