Baby

Create models from a JSON file, even a Baby can do it.

Description

Baby can infer property's type from json such as String, Int, Double, URL and Date.

Baby can handle nested json, it will generate nested models.

Baby supports Codable from Swift 4.

Example

JSON:

{
    "id": 42,
    "name": "nixzhu",
    "twitter": {
        "profile_url": "https://twitter.com/nixzhu",
        "created_at": "2009-05-12T10:25:43.511Z"
    }
}

Swift code with Codable:

struct User: Codable {
    let id: Int
    let name: String
    struct Twitter: Codable {
        let profileURL: URL
        let createdAt: Date
        private enum CodingKeys: String, CodingKey {
            case profileURL = "profile_url"
            case createdAt = "created_at"
        }
    }
    let twitter: Twitter
}

Note that there use Property Map profile_url: profileURL to change the property name (Automatically generated will be profileUrl).

Swift code without Codable:

struct User {
    let id: Int
    let name: String
    struct Twitter {
        let profileURL: URL
        let createdAt: Date
        init(profileURL: URL, createdAt: Date) {
            self.profileURL = profileURL
            self.createdAt = createdAt
        }
        init?(json: [String: Any]) {
            guard let profileURLString = json["profile_url"] as? String else { return nil }
            guard let profileURL = URL(string: profileURLString) else { return nil }
            guard let createdAtString = json["created_at"] as? String else { return nil }
            guard let createdAt = DateFormatter.iso8601.date(from: createdAtString) else { return nil }
            self.init(profileURL: profileURL, createdAt: createdAt)
        }
    }
    let twitter: Twitter
    init(id: Int, name: String, twitter: Twitter) {
        self.id = id
        self.name = name
        self.twitter = twitter
    }
    init?(json: [String: Any]) {
        guard let id = json["id"] as? Int else { return nil }
        guard let name = json["name"] as? String else { return nil }
        guard let twitterJSONDictionary = json["twitter"] as? [String: Any] else { return nil }
        guard let twitter = Twitter(json: twitterJSONDictionary) else { return nil }
        self.init(id: id, name: name, twitter: twitter)
    }
}

You may need a DateFormatter extension:

extension DateFormatter {

    static let iso8601: DateFormatter = {
        let formatter = DateFormatter()
        formatter.timeZone = TimeZone(abbreviation: "UTC")
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSSSSZ"
        return formatter
    }()
}