Decodable netsted containers

netstedContainer.swift

class Product: Decodable {
    var id: Int
    var art: String?
    var title: String?

    var votesCount: Int
    var averageRating: Double

    enum CodingKeys: String, CodingKey {
        case id
        case art
        case title
        case ratings
    }
	enum RatingsCodingKeys: String, CodingKey {
        case votesCount = "votes_count"
        case averageRating = "average_rating"
    }
	required init(from decoder: Decoder) throws {
        let container = try decoder.container(keyedBy: CodingKeys.self)

        self.id = try container.decode(Int.self, forKey: .id)
        self.art = try? container.decode(String.self, forKey: .art)
        self.title = try? container.decode(String.self, forKey: .title)

        // Nested ratings
        let ratingsContainer = try container.nestedContainer(keyedBy: RatingsCodingKeys.self, forKey: .ratings)
        self.votesCount = try ratingsContainer.decode(Int.self, forKey: .votesCount)
        self.averageRating = try ratingsContainer.decode(Double.self, forKey: .averageRating)
    }
}