Json Decode to swift class with dynamic value class/struct type

Question

I have multiple responses which has similar pattern but one key value has always different object in response of json which i want to decode in base model where one key has variety of object type.

Response be like,

{
"status": true,
"message": "Success",
"data":[]
}

Here in data response it has any kind of array of objects or any single object

struct BaseResponseModel: Codable {
    var status: Bool
    var message: String
    var data: DataClass
    
    enum CodingKeys: String, CodingKey {
        case message
        case data
        case status
    }
}

what we can do here to make it single class with data type object pass,

Anyone please..!

Frankenstein · Accepted Answer · 2020-06-24 10:40:37Z

2

Use Swift generics, and provide the type only at the time of decoding:

struct BaseResponseModel<DataType: Codable>: Codable {
    var status: Bool
    var message: String
    var data: DataType
}

Usage:

let myData = try JSONDecoder().decode(BaseResponseModel<MyStruct>.self, from: data).data // For object
let myData = try JSONDecoder().decode(BaseResponseModel<[MyStruct]>.self, from: data).data // For array

Note: You don't need CodingKeys if the rawValues are the same.

edited Jun 24, 2020 at 10:40

answered Jun 24, 2020 at 10:33

Frankenstein

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2 Comments

Solid Soft Over a year ago

DataType is not always single object, it may be array of objects, How it work?

Frankenstein Over a year ago

Added usage example for object and array.

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