Struggling to decode a JSON - ios

Question

I have this json I get from an API:
{
"product_id": "id",
"name": "name",
"manufacturer": "manufacturer",
"image_url": "url",
"additional_info": "",
"store_id": "id",
"store_name": "name",
"owner_id": "id",
"quantities": [
{
"ml": 1,
"price": 2
},
{
"ml": 1,
"price": 2
},
{
"ml": 1,
"price": 2
},
{
"ml": 1,
"price": 2
}
]
}
This is the model I have:
struct Quantity: Codable {
var ml: Int
var price: Float
enum CodingKeys : String, CodingKey {
case ml = "ml"
case price = "price"
}
}
struct Product: Codable {
let uuid: String
let productName: String
let productManufacturer: String
let productImage: String
let quantities: [Quantity]
let additionalInfo: String?
let storeID: String
let storeName: String
let ownerID: String
enum CodingKeys : String, CodingKey {
case uuid = "product_id"
case productName = "name"
case productManufacturer = "manufacturer"
case productImage = "image_url"
case quantities = "quantities"
case additionalInfo = "additional_info"
case storeID = "store_id"
case storeName = "store_name"
case ownerID = "owner_id"
}
}
I'm trying to decode this, but I get this error:
Failed to decode json: typeMismatch(Swift.Array<Any>, Swift.DecodingError.Context(codingPath: [], debugDescription: "Expected to decode Array<Any> but found a dictionary instead.", underlyingError: nil))
This is how I decode the JSON:
func fetchGenericData<T: Decodable>(request: URLRequest, completion: #escaping(T) -> ()) {
URLSession.shared.dataTask(with: request) { (data, response, error) in
if let error = error {
//TODO: Handle error.
print(error)
return
}
guard let data = data else { return }
do {
let object = try self.decoder.decode(T.self, from: data)
completion(object)
}catch let jsonError{
print("Failed to decode json: ", jsonError)
}
}.resume()
}
I understand the error, but I don't know how to fix it.
I don't know what is wrong here, I thought maybe the Quantity, but, to me, it looks like it should decode it just fine, just as "product_id" has value, so each quantity object has it's key and it's value, that doesn't look like a dictionary to me.
Is the problem even in the Quantity object?

Answer 1

My guess is You seem to be trying to decode an array of products but actually it only returning a dictionary that contains only one product. Try this code which tries to decode your JSON into a single product and it should fix the issue:
fetchGenericData(request: request) { (product: Product) in
print(product)
}
Instead of what you might be doing right now which could look like this:
fetchGenericData(request: request) { (products: [Product]) in
print(product)
}

Answer 2

You should use try JSONDecoder().decode(Product.self, from: data)
I think you pass [Product].self