CODEWITHSUNDEEP
iosjsonswiftnsdictionary
John Doe
John Doe

Reputation: 821

How to create a dictionary with 2 arrays inside?

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?

Upvotes: 1

Views: 75

Answers (1)

Ole Begemann
Ole Begemann

Reputation: 135558

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.

Upvotes: 1

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