Realm & Swift Codable
How to implement Swift 4 Codable with Realm Database in your Models?
This guide will demonstrate the implementation method for Realm Object containing a List, with Swift 4 Codable.
JSON
{
"id": 732,
"name": "Vendor Name",
"logo": ".../thumb/missing.png",
"kitchens": [
{
"id": 36,
"name": "Sandwiches"
},
{
"id": 37,
"name": "Fast Food"
}
]
}Model
import RealmSwift
class VendorsList : Object, Decodable {
@objc dynamic var id : Int = 0
@objc dynamic var name : String?
@objc dynamic var logo : String?
// Create your Realm List.
var kitchensList = List<VendorKitchens>()
override class func primaryKey() -> String? {
return "id"
}
private enum CodingKeys: String, CodingKey {
case id
case name
case logo
// Set JSON Object Key
case kitchensList = "kitchens"
}
public required convenience init(from decoder: Decoder) throws {
self.init()
let container = try decoder.container(keyedBy: CodingKeys.self)
self.id = try container.decode(Int.self, forKey: .id)
self.name = try container.decode(String.self, forKey: .name)
self.logo = try container.decode(String.self, forKey: .logo)
// Map your JSON Array response
let kitchens = try container.decodeIfPresent([VendorKitchens].self, forKey: .kitchensList) ?? [VendorKitchens()]
kitchensList.append(objectsIn: kitchens)
}
}
class VendorKitchens : Object, Decodable {
@objc dynamic var id : Int = 0
@objc dynamic var name : String?
override class func primaryKey() -> String? {
return "id"
}
private enum CodingKeys: String, CodingKey {
case id
case name
}
}URLSession
guard let getUrl = URL(string: "https://Your_Endpoint/.../") else { return }
URLSession.shared.dataTask(with: getUrl) { (data, response, error) in
guard let data = data else { return }
do {
let decoder = JSONDecoder()
let getData = try decoder.decode([VendorsList].self, from: data)
for data in getData {
print(data.id)
print(data.name)
print(data.logo)
}
for kitchen in data.kitchensList {
print(kitchen.name)
}
}
} catch let err {
print("Err", err)
}
}.resume()