Trying to figure out why my URLsession isn't working

Question

I'm currently learning Swift and recreating an app as a project. I have this API that I'm trying to hit but it's just not working, sometimes. I put in breakpoints at the completion and sometimes I'll get a hit with response, but a majority of times I won't. Error returns nil btw.

APIService.swift

import Foundation

final class APIService {
    init(){}
    
    struct Constants{
        static let apiURL = URL(string: "https://public.opendatasoft.com/api/explore/v2.1/catalog/datasets/airbnb-listings/records?limit=100&refine=city%3A%22New%20York%22&refine=room_type%3A%22Entire%20home%2Fapt%22")
        
    }
    
    public func getListings(completion: @escaping (Result<[WindbnbListing], Error>) -> Void) {
        guard let url = Constants.apiURL else {
            return
        }
        let request = URLRequest(url: url)
        let task = URLSession.shared.dataTask(with: request) { data, _, error in
            guard let data = data, error == nil else {
                if let error {
                    completion(.failure(error))
                }
                return
            }
            
            do{
                let response = try JSONDecoder().decode(WindbnbListingsResponse.self, from: data)
                completion(.success(response.results))
            }catch{
                let json = try? JSONSerialization.jsonObject(with: data)
                print(String(describing: json))
                completion(.failure(error))
            }
        }
        task.resume()
    }
}

WindbnbListingsResponse.swift

import Foundation

struct WindbnbListingsResponse: Codable {
    let total_count: Int
    let results: [WindbnbListing]
    
}

WindbnbListing.swift

import Foundation

struct WindbnbListing: Codable, Hashable, Identifiable {
    let id: String?
    let listing_url: String?
    let name: String?
    let summary: String?
    let space: String?
    let description: String?
    let house_rules: String?
    let thumbnail_url: String?
    let medium_url: String?
    let xl_picture_url: String?
    let neighborhood: String?
    let amenities: [String]?
    let price: Int?
    
    //Host info
    let host_name: String
    let host_since: String
    let host_thumbnail_url: String
    let host_picture_url: String
}

Heres a glimpse of console output when it somehow works...Breakpoints on completion(.success(response.results)) and completion(.failure(error))

Console output: data Foundation.Data? 598105 bytes some _1 URLResponse? 0x0000600000266900 error Error? nil none completion () -> () 0x00000001023b047c Windbnbpartial apply forwarder for closure #1 (Swift.Result<Swift.Array<Windbnb.WindbnbListing>, Swift.Error>) -> () in Windbnb.WindbnbListingsViewViewModel.fetchListings() -> () at data Foundation.Data 598105 bytes
response Windbnb.WindbnbListingsResponse ` As you can see, I get a response working sometimes...could it be an endpoint issue where Im being rate limited? Doubtful because in postman I can keep making requests over and over and over with no hiccups

Answer 1

Answered by @workingdogsupportUkraine !

In your WindbnbListing make all properties optional. That is, add ? to host_name, host_since, host_thumbnail_url and host_picture_url. With that, your code works well for me. To further debug your code, add print("---> error: (error)") to your catch. – workingdog support Ukraine