Codable, introduced in Swift 4, makes is possible to share Swift classes and structs between client and server, making it easy to share data. It can also be used to add such more type safety to other parts of Fullstack Swift. This presentations shows some of the many ways that Codable is being using in Kitura to enable Fullstack Swift.

1. Codable
The key to Fullstack Swift
Swift Cloud Workshop 3
February 23rd, 2018
Chris Bailey
(@Chris__Bailey)

2. Codable

3. struct Profile {
var name: String
var photo: Data
var dateOfBirth: Date
}
let profile = Profile(name: “Chris”, photo: image, dateOfBirth: Date(“06-06-1980”))

4. struct Profile : Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
let profile = Profile(name: “Chris”, photo: image, dateOfBirth: Date(“06-06-1980”))

5. struct Profile : Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
let profile = Profile(name: “Chris”, photo: image, dateOfBirth: Date(“06-06-1980”))
let encoder = JSONEncoder()
let jsonData = try encoder.encode(profile)

6. struct Profile : Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
let profile = Profile(name: “Chris”, photo: image, dateOfBirth: Date(“06-06-1980”))
let encoder = JSONEncoder()
let jsonData = try encoder.encode(profile)
let decoder = JSONDecoder()
let person = try decoder.decode(Profile.self, from: jsonData)

7. Fullstack
Development

8. {
"name": "",
"photo": "",
"dateOfBirth": ""
}
{
"name": "",
"photo": "",
"dateOfBirth": {
"year":
"month":
"day":
}
}
struct Profile {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift
var profile: [String : Any]
Swift
KITURA

9. let profile = Profile(name: name, photo: photo)let json = JSON(data: data)
guard json["name"].exists() else {
response.status(.unprocessableEntity)
response.send(json: JSON([ "error": "Missing reqired property `name`" ]))
next()
}
guard let photo = Data(base64Encoded: photoString) else {
response.status(.unprocessableEntity)
response.send(json: JSON([ "error": "Type mismatch, `photo` expected to be Base64 encoded data" ]))
next()
}
guard let name = json["name"].string else {
response.status(.unprocessableEntity)
response.send(json: JSON([ "error": "Type mismatch, `name` expected to be a String" ]))
next()
}
guard json["photo"].exists() else {
response.status(.unprocessableEntity)
response.send(json: JSON([ "error": "Missing reqired property photo`" ]))
next()
}
guard let photoString = json[“photo"].string else {
response.status(.unprocessableEntity)
response.send(json: JSON([ "error": "Type mismatch, `photo` expected to be a String" ]))
next()
}

16. struct Profile {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift

17. struct Profile {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
KITURA

18. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
KITURA

19. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
KITURA

20. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
let encoder = JSONEncoder()
let data = try encoder.encode(profile)
KITURA

21. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
let decoder = JSONDecoder()
let person = try decoder.decode(Person.self, from: jsonData)
KITURA

22. {
"name": "",
"photo": "",
"dateOfBirth": ""
}
{
"name": "",
"photo": "",
"dateOfBirth": ""
}
struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
KITURA

23. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
KITURA

24. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
KITURA

25. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
Swift Swift
struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
KITURA

26. Under the Hood

27. struct Profile {
var name: String
var photo: Data
var dateOfBirth: Date
}

28. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}

29. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}

30. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}
extension Profile : Decodable {
init(from decoder: Decoder) throws {
}
}

31. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}
extension Profile : Decodable {
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
}
}

32. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}
extension Profile : Decodable {
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
name = try values.decode(String.self, forKey: .name)
}
}

33. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}
extension Profile : Decodable {
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
name = try values.decode(String.self, forKey: .name)
photo = try values.decode(Data.self, forKey: .photo)
}
}

34. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}
extension Profile : Decodable {
init(from decoder: Decoder) throws {
let values = try decoder.container(keyedBy: CodingKeys.self)
name = try values.decode(String.self, forKey: .name)
photo = try values.decode(Data.self, forKey: .photo)
dateOfBirth = try values.decode(Date.self, forKey: .dateOfBirth)
}
}

35. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}
extension Profile : Encodable {
func encode(to encoder: Encoder) throws {
}
}

36. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}
extension Profile : Encodable {
func encode(to encoder: Encoder) throws {
var container = try encoder.container(keyedBy: CodingKeys.self)
}
}

37. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
extension Profile {
enum CodingKeys: String, CodingKey {
case name = "name"
case photo = "photo"
case dateOfBirth = "dateOfBirth"
}
}
extension Profile : Encodable {
func encode(to encoder: Encoder) throws {
var container = try encoder.container(keyedBy: CodingKeys.self)
try container.encode(name, forKey: .name)
try container.encode(photo, forKey: .photo)
try container.encode(dateOfBirth, forKey: .dateOfBirth)
}
}

38. Body Data

39. {
"name": "John Doe",
"photo": "jbbkj362",
"dateOfBirth": "06-06-1980“
}

40. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}

41. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)

42. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(request: RouterRequest, response: RouterResponse, next: () -> Void) -> Void
{
}

43. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(request: RouterRequest, response: RouterResponse, next: () -> Void) -> Void
{
var profile = request.read(as: Profile.Type)
}

44. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
}

45. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}

46. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
router.post("/profile", handler: addProfile)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}

47. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
router.post("/profile", handler: addProfile)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}
func addProfile(profile: Profile, respondWith: @escaping (Profile?, Error?) -> Void) -> Void
{
...
respondWith(profile, nil)
}

48. guard let backend = KituraKit(baseURL: "http://localhost:8080") else {
print("Error creating KituraKit client")
return
}
backend.get("/profile") { (profiles: [Profile]?, error: RequestError?) in
...
}
KITURAKIT

49. Query Parameters

50. GET: /profile?name=“John Doe”#

51. {
"name": "John Doe",
"photo": "jbbkj362",
"dateOfBirth": "06-06-1980“
}

52. {"name": "John Doe","photo": "jbbkj362","dateOfBirth": "06-06-1980"}

53. {"name": "John Doe" }

54. {"name": "John Doe"}

55. {“name"= "John Doe"}

56. { name = "John Doe"}

57. ? name = "John Doe"}

58. ? name = "John Doe"#

59. ?name="John Doe"#

60. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}

61. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}

62. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles( , respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}

63. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles(query: Query, respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}

64. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles(query: Query, respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles , nil)
}

65. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles(query: Query, respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles.filter{ ($0.name == query.name), nil)
}

66. What Else?

67. SELECT * from Profiles

68. name,, photo, dateOfBirth,
"John Doe", "jbbkj362", "06-06-1980",

69. name,, photo, dateOfBirth
"John Doe", "jbbkj362", "06-06-1980"

70. name:”John Doe”,photo:”jbbkj362”,dateOfBirth:”06-06-1980"

71. {name:”John Doe”,photo:”jbbkj362”,dateOfBirth:”06-06-1980”}

72. struct Profile: Codable {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}

73. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
...
respondWith(profiles, nil)
}

74. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll()
respondWith(profiles, nil)
}

75. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll(respondWith)
respondWith(profiles, nil)
}

76. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(respondWith: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll(respondWith)
}

77. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(completion: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll(completion)
}

78. SELECT * from Profiles

79. SELECT * from Profiles

80. SELECT * from Profiles WHERE name = “John Doe”

81. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
router.get("/profile", handler: getProfiles)
func getProfiles(completion: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll(completion)
}

82. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles(completion: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll(completion)
}

83. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles(query: Query, completion: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll(completion)
}

84. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles(query: Query, completion: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll( completion)
}

85. struct Profile: Model {
var name: String
var photo: Data
var dateOfBirth: Date
}
struct Query: QueryParams {
var name: String
}
router.get("/profile", handler: getProfiles)
func getProfiles(query: Query, completion: @escaping ([Profile]?, Error?) -> Void) -> Void
{
Profile.getAll(matching: query, completion)
}

86. Codable

87. Dynamic Swift

88. Questions