Issues parsing JSON data with Swift from API - swift

Question

I am attempting to get data from an API and bring it into swift. I have managed to connect to th API and get the data come into the console however when I attempt to parse the data I have an issue - below is the function that does the connection and should parse the data.
I am having an issue with the line:
let fetchedData = try JSONSerialization.jsonObject(with: data!, options: .mutableLeaves) as! NSArray
It is producing the fatal error SIGABRT when running the app (the function parseData() is called within viewDidLoad()) and the console produces the following - Could not cast value of type '__NSDictionaryI' (0x103b7f288) to 'NSArray' (0x103b7ee28).
func parseData() {
let url = "https://api.***"
var request = URLRequest(url: URL(string: url)!)
let headers = [
"user": "***",
"auth": "***"
]
request.httpMethod = "GET"
request.allHTTPHeaderFields = headers
let configuration = URLSessionConfiguration.default
let session = URLSession(configuration: configuration, delegate: nil, delegateQueue: OperationQueue.main)
let task = session.dataTask(with: request) { (data, response, error) in
if (error != nil) {
print("Error")
} else {
do {
let fetchedData = try JSONSerialization.jsonObject(with: data!, options: .mutableLeaves) as! NSArray
for eachFetchedOpportunity in fetchedData {
let eachOpportunity = eachFetchedOpportunity as! [String : Any]
let opportunity = eachOpportunity["subject"] as! String
let startDate = eachOpportunity["starts_at"] as! String
self.fetchedOpportunitys.append(Opportunity(opportunityName: opportunity, startDate: startDate))
}
print(self.fetchedOpportunitys)
} catch {
print("Error")
}
}
}
task.resume()
}
Here is the start of the returned data (I haven't included all of the data as some of it is private and unnecessary) from the server that I have accessed through postman - I believe my problem may reside in the fact that there is a mix of Dictionaries and Arrays here and I am unaware on how to correctly parse the data if this is the case.
{
"opportunities": [
{
"id": 3,
"store_id": 1,
"project_id": null,
"member_id": 5,
"billing_address_id": 5,
"venue_id": null,
"tax_class_id": 1,
"subject": "***",
"description": "",
"number": "00000000**",
"starts_at": "2017-05-27T08:00:00.000Z",
"ends_at": "2017-05-27T16:00:00.000Z",
"charge_starts_at": "2017-05-27T08:00:00.000Z",
"charge_ends_at": "2017-05-27T16:00:00.000Z",
"ordered_at": "2017-05-25T21:10:00.000Z",
"quote_invalid_at": null,
"state": 3,
...
...
}
],
"meta": {
"total_row_count": 2,
"row_count": 2,
"page": 1,
"per_page": 12
}
}

Answer 1

Your JSON response is Dictionary not Array and the array you are looking for is opportunities that you need to get from the dictionary.
do {
let fetchedData = try JSONSerialization.jsonObject(with: data!, options: []) as! [String:Any]
let opportunities = fetchedData["opportunities"] as? [[String:Any]] ?? []
for opportunity in opportunities {
let subject = opportunity["subject"] as? String ?? "Default Subject"
let startDate = opportunity["starts_at"] as? String ?? "Default Date"
self.fetchedOpportunitys.append(Opportunity(opportunityName: subject, startDate: startDate))
}
}
catch {
print("Error")
}