Alamofire Post Request with nested JSON parameters

Question

My Alamofire post request looks like this:

Alamofire.request("http://...", method: HTTPMethod.post, parameters: parameters, encoding: JSONEncoding.default, headers: nil)
         .responseJSON(completionHandler: {(response) in ... })

Everything works fine if my parameters are simple:

let parameters: Parameters = [
    "firstName": "John",
    "lastName": "Doe"
]

I run into problems if my parameters contain a json object.

let address: JSON = [
    "street": "1234 Fake St",
    "city": "Seattle",
    "state": "WA"
]

let parameters: Parameters = [
    "firstName": "John",
    "lastName": "Doe",
    "address": address
]

The Alamofire request is not performed and my application crashes.

What is JSON in let address: JSON?

Bista
– Bista

2016-12-23 04:52:21 +00:00
Commented Dec 23, 2016 at 4:52 — Bista
– Bista, Commented Dec 23, 2016 at 4:52
@Mr.Bista I'm using SwiftyJSON. JSON is a data type.

Derek Soike
– Derek Soike

2016-12-27 20:38:54 +00:00
Commented Dec 27, 2016 at 20:38 — Derek Soike
– Derek Soike, Commented Dec 27, 2016 at 20:38
were u able to resolve the issue?

Bista
– Bista

2016-12-28 15:54:24 +00:00
Commented Dec 28, 2016 at 15:54 — Bista
– Bista, Commented Dec 28, 2016 at 15:54

Derek Soike · Accepted Answer · 2016-12-23 01:35:57Z

3

I believe the issue here is that Alamofire is trying to encode a parameter as json that is already a json object. Essentially, double-encoding causes the application to crash.

The solution I found was to decode the json parameter before performing the request using SwiftyJSON's .rawValue.

let parameters: Parameters = [
    "firstName": "John",
    "lastName": "Doe",
    "address": address.rawValue
]

https://github.com/SwiftyJSON/SwiftyJSON#raw-object

answered Dec 23, 2016 at 1:35

Derek Soike

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Comments

IBG · Accepted Answer · 2018-07-30 10:34:34Z

1

For those not using SwiftyJSON, the Parameters type accepts a Parameters type as well, like so:

let address: Parameters = [
    "street": "1234 Fake St",
    "city": "Seattle",
    "state": "WA"
]

let parameters: Parameters = [
    "firstName": "John",
    "lastName": "Doe",
    "address": address
]

answered Jul 30, 2018 at 10:34

IBG

41512 silver badges35 bronze badges

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