Heterogeneous collection literal could only be inferred to '[String : Any]'; add explicit type annotation if this is intentional

Question

I have a POST body paramter like this:

{
  "id": 0,
  "name": "string",
  "contactInfo": "string",
  "message": "string"
}

So since i am using the Alamofire for posting the parameters i am describing the post body dictionary like this:

let body = ["id": userID, "name": userName, "contactInfo": contactInfo, "message": message]

class func postUserFeedback(userID: Int, userName: String, contactInfo: String, message: String,completionHandler: @escaping (FeedbackResponse?) -> Void) {
    let body = ["id": userID, "name": userName, "contactInfo": contactInfo, "message": message]
    request(route: .userFeedback, body: body).responseObject { (response: DataResponse<FeedbackResponse>) in

      response.result.ifSuccess({
        completionHandler(response.result.value)
      })

      response.result.ifFailure {
        completionHandler(nil)
      }
    }

  }

But i am getting the error like this:

What i am doing wrong in this syntax?

vadian · Accepted Answer · 2020-10-23T16:03:35.163

29

If the type could not be inferred you have to annotate

let body : [String:Any] = ["id": userID, "name": userName, "contactInfo": contactInfo, "message": message]

or bridge cast it:

let body = ["id": userID, "name": userName, "contactInfo": contactInfo, "message": message] as [String:Any]

edited Oct 23 '20 at 16:03

answered Jul 23 '17 at 18:40

vadian

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Tamás Sengel · Answer 2 · 2022-12-21T15:58:44.350

4

You should add a [String: Any] explicit type to the variable.

let body: [String: Any] = [
    "id": userID, 
    "name": userName,
    "contactInfo": contactInfo,
    "message": message
]

edited Dec 21 '22 at 15:58

answered Jul 23 '17 at 18:38

Tamás Sengel

55,884
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score 0 · Answer 3 · answered Jun 10 '23 at 03:23

This is because you are constructing your post request with mix of data type i.e

String
Int (You are trying to send id as Int 0)

{ "id": 0, "name": "string", "contactInfo": "string", "message": "string" }

So, you have to use [String:Any] during declaration. If you don't want to use a casting [String:Any] convert id type Int to String like below.

{
      "id": "0",
      "name": "string",
      "contactInfo": "string",
      "message": "string"
}

Same error could be occurred if you use one Bool param and others String param.

Heterogeneous collection literal could only be inferred to '[String : Any]'; add explicit type annotation if this is intentional

3 Answers3