如何将 JSON 转换为 Swift Dictinary 以进行 HTTP POST

Question

I am having issues to successfully structure my json data into a swift dictionary inorder to send my HTTP body via an API

This is how my Json is structured:

{
  "idNo": "string",
  "name": "string",
  "isRegistered": true,
  "customMessage": "string",
  "riskStatus": "Low",
  "exposureBasedRiskStatus": "Low",
  "symptomBasedRiskStatus": "Low",
  "riskMessage": "string",
  "doYouHaveATemperature": true,
  "temperature": 0,
  "asessmentQuestion": [
    {
      "question": "string",
      "answer": "string",
      "createdBy": "string"
    },
    {
      "question": "string",
      "answer": "string",
      "createdBy": "string"
    },
    {
      "question": "string",
      "answer": "string",
      "createdBy": "string"
    },
    {
      "question": "string",
      "answer": "string",
      "createdBy": "string"
    },
    {
      "question": "string",
      "answer": "string",
      "createdBy": "string"
    }
  ]
}

the object "asessmentQuestion" is an array of different questions, can't seem to figure out how to convert this structure to a swift dictionary or another recommended format for me to be able to post my data. My API is always saying bad request and I'm pretty sure I am not correctly mapping the json data.

this is a snippet of how I am attempting to map my json data:

   var dictionary = [String:Any]()
    
    dictionary["1. How old are you?"] = model.riskExposureBasedAssessment[0].answer
    dictionary["2. Have you ever visited a COVID affected country?"] = model.riskExposureBasedAssessment[1].answer
    dictionary["3. do you frequently experience flu like symptoms?"] = model.riskExposureBasedAssessment[2].answer
    dictionary["4. Where you providing care in a non-health setting for a person with symptomatic COVID-19 infection"] = model.riskExposureBasedAssessment[3].answer
    dictionary["5. Did you come in close contact* with a person with symptomatic laboratory-confirmed COVID-19 infection?"] = model.riskExposureBasedAssessment[4].answer
    
    let parameters = [
        "idNo": model.id,
        "name": model.name,
        "isRegistered": model.isRegistered,
        "customMessage": model.customResponse,
        "riskStatus": model.riskStatus,
             "exposureBasedRiskStatus": model.exposureBasedRiskStatus,
             "symptomBasedRiskStatus": model.symptomBasedRiskStatus,
             "riskMessage": model.riskMessage,
             "doYouHaveATemperature": model.doYouHaveATemperature,
             "temperature": model.temperature,
        "exposureBasedAssessments":  dictionary
        
        ] as [String:Any]
    
    
    
    let postData = try? JSONSerialization.data(withJSONObject: parameters)

Answer 1

It's an array of dictionary, so :

var dictionaries: [[String: Any]] = []
// Populate dictionaries
// ...

let parameters = [
    "idNo": model.id,
    "name": model.name,
    "isRegistered": model.isRegistered,
    "customMessage": model.customResponse,
    "riskStatus": model.riskStatus,
    "exposureBasedRiskStatus": model.exposureBasedRiskStatus,
    "symptomBasedRiskStatus": model.symptomBasedRiskStatus,
    "riskMessage": model.riskMessage,
    "doYouHaveATemperature": model.doYouHaveATemperature,
    "temperature": model.temperature,
    "exposureBasedAssessments":  dictionaries    
    ] as [String:Any]

Then, to populate it:

var dict1: [String: Any] = [:]
dict1["question"] = "1. How old are you?"
dict1["answer"] = model.riskExposureBasedAssessment[0].answer
dictionaries.append(dict1)

var dict2: [String: Any] = [:]
dict2["question"] = "2. Have you ever visited a COVID affected country?"
dict2["answer"] = model.riskExposureBasedAssessment[1].answer
dictionaries.append(dict2)

...

or

var dict1: [String: Any] = ["question": "1. How old are you?",
                            "answer": model.riskExposureBasedAssessment[0].answer]
dictionaries.append(dict1)

var dict2: [String: Any] = ["question": "2. Have you ever visited a COVID affected country?"",
                            "answer": model.riskExposureBasedAssessment[1].answer]
dictionaries.append(dict2)

...

But, I guess you have can retrieve the question from model.riskExposureBasedAssessment[n] , Instead of "1. How old are you?" , can't you do model.riskExposureBasedAssessment[0].question ?

If that's the case, you can use a for loop: so I'd go with:

for aQuestionModel in model.riskExposureBasedAssessment {
    let questionDict = ["question": aQuestionModel.question,
                        "answer": aQuestionModel.answer]
    dictionaries.append(questionDict)
}

Or, once you master basic algorithm, closures, and map() :

var dictionaries = model.riskExposureBasedAssessment.map { ["question": $0.question, "answer": $0.answer] }

It's missing the "createdBy", I don't know where to find it and if it's optional, but I think you should be able to add it if needed.

NotaBene: Code not tested against a compiler. It should work, at maybe one or two typos.