I have a problem with parsing data from web service, it seems that the decodable protocol couldn't parse this json
This is my parsing data using generics.
public func requestGenericData<T: Decodable>(urlString: String, httpMethod: String?, token: String!, completion: @escaping(T) ->()) {
let fullStringUrl = url + urlString
guard let url = URL(string: fullStringUrl) else { return }
guard let token = token else { return }
var urlRequest = URLRequest(url: url)
urlRequest.setValue("application/json", forHTTPHeaderField: "accept")
urlRequest.setValue("Bearer \(token)", forHTTPHeaderField: "Authorization")
urlRequest.httpMethod = httpMethod
URLSession.shared.dataTask(with: urlRequest) { (data, response, error) in
if self.isInternetAvailable() {
guard let data = data else { return }
if let httpResponse = response as? HTTPURLResponse {
if httpResponse.statusCode >= 200 && httpResponse.statusCode < 300 {
do {
let obj = try JSONDecoder().decode(T.self, from: data)
completion(obj)
} catch {
print("Error: \(String(describing: error))\n StatusCode: \(httpResponse.statusCode)")
}
}
}
} else {
showAlert(title: "No Internet Connect", message: "Please open your network and try again.", alertStyle: .alert, buttonTitle: "OK", buttonStyle: .default)
return
}
}.resume()
}
This is my model
struct JobWithCategory: Decodable {
let jobTypeID: Int
let jobCategoryID: Int
let name: String
let getJobs: [getJobs]
}
struct getJobs: Decodable {
let name: String
let description: String
}
struct JobCategories: Decodable {
let jobCategories: [JobWithCategory]
}
apiHelper.requestGenericData(urlString: "url/on/something/else", httpMethod: "GET", token: token) { (jobCategories: [JobCategories]) in
print(jobCategories)
}
Now i'm having with this issue on my console printed:
Error: typeMismatch(Swift.Array, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array but found a dictionary instead.", underlyingError: nil))
What do I missed or did something wrong with my implementation? Could someone help me out on this one, and so please elaborate why is this happening so I can have a good grasp on whats going on on my code.
Thanks in advance :)
Because you use
[JobCategories]
as the completion T
is inferred to array so
T.self = [JobCategories].self
not a dictionary , so try this
apiHelper.requestGenericData(urlString: "url/on/something/else",
httpMethod: "GET", token: token) { (jobCategories:JobCategories) in
print(jobCategories.jobCategories)
}
Please read the error message
Expected to decode Array but found a dictionary instead
The expected side shows what you are doing (wrong) and the found side shows the actual type.
In terms of Decodable
a dictionary is a struct. So it's
...{ (jobCategories: JobCategories) in
The technical post webpages of this site follow the CC BY-SA 4.0 protocol. If you need to reprint, please indicate the site URL or the original address.Any question please contact:yoyou2525@163.com.