JSONCop

JSONCop makes it easy to write a simple model layer for your Cocoa and Cocoa Touch application.

JSONCop scans all the methods and variables like JSONKeyPathByPropertyKey xxxJSONTransformer in all the structs which declare //@jsoncop before struct declaration line. And it won't change your original project structure.

let json: [String: Any] = [
    "id": 1,
    "name": "Draven",
    "createdAt": NSTimeIntervalSince1970
]
let person = Person.parse(json: json)

1. Run cop install in a project root folder
2. Add //@jsoncop just before model definition line

$ sudo gem install jsoncop --verbose
$ cop install

//@jsoncop
struct Person {
    let id: Int
    let name: String
}

Then, each time build action is triggered, JSONCop would generate several parsing methods in swift files.

All the code between // MARK: - JSONCop-Start and // JSONCop-End and will be replaced when re-run cop generate in current project folder. Other codes will remain unchanged. Please don't write any codes in this area.

extension Person {
    static func parse(json: Any) -> Person? {
        guard let json = json as? [String: Any] else { return nil }
        guard let id = json["id"] as? Int,
            let name = json["name"] as? String,
            let projects = (json["projects"] as? [[String: Any]]).flatMap(projectsJSONTransformer) else { return nil }
        return Person(id: id, name: name, projects: projects)
    }
    static func parses(jsons: Any) -> [Person] {
        guard let jsons = jsons as? [[String: Any]] else { return [] }
        return jsons.flatMap(parse)
    }
}

Checkout JSONCopExample for more information.

• JSON key to attribute customisation

  struct Person {
      let id: Int
      let name: String
  
      static func JSONKeyPathByPropertyKey() -> [String: String] {
          return ["name": "nickname"]
      }
  }

• Value transformer customisation

  struct Person {
      let id: Int
      let name: String
      let gender: Gender
      let projects: [Project]
  
      enum Gender: Int {
          case male = 0
          case female = 1
      }
  
      static func genderJSONTransformer(value: Int) -> Gender? {
          return Gender(rawValue: value)
      }
  
      static func projectsJSONTransformer(value: [[String: Any]]) -> [Project] {
          return value.flatMap(Project.parse)
      }
  }

• Nested JSON value extraction

  static func JSONKeyPathByPropertyKey() -> [String: String] {
      return ["currentProjectName": "project.name"]
  }

sudo gem install jsoncop --verbose

Bug reports and pull requests are welcome on GitHub at https://github.com/draveness/jsoncop. This project is intended to be a safe, welcoming space for collaboration, and contributors are expected to adhere to the Contributor Covenant code of conduct.

The gem is available as open source under the terms of the MIT License.