Created
September 8, 2013 09:20
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Json4s Scalaz7 example
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| libraryDependencies ++= Seq( | |
| "org.json4s" %% "json4s-scalaz" % "3.2.5", | |
| "org.json4s" %% "json4s-native" % "3.2.5" | |
| ) | |
| scalaVersion := "2.10.2" |
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| /** | |
| * https://github.com/json4s/json4s/issues/39 | |
| * | |
| * Validation Monad instance removed from Scalaz7. | |
| * https://github.com/scalaz/scalaz/blob/v6.0.4/core/src/main/scala/scalaz/Validation.scala#L133-L147 | |
| * | |
| * need explicitly convert to `scalaz.\/` (aka disjunction) if you want use the `Kleisli` composition | |
| */ | |
| object Main extends App { | |
| import scalaz._ | |
| import Scalaz._ | |
| import org.json4s.scalaz.JsonScalaz._ | |
| import org.json4s._ | |
| import org.json4s.native.JsonMethods._ | |
| case class Address(street: String, zipCode: String) | |
| case class Person(name: String, age: Int, address: Address) | |
| val json = parse(""" {"street": "Manhattan 2", "zip": "00223" } """) | |
| val address1 = (field[String]("street")(json) |@| field[String]("zip")(json)) { Address } | |
| println(address1) | |
| val address2 = (field[String]("streets")(json) |@| field[String]("zip")(json)) { Address } | |
| println(address2) | |
| val address3 = Address.applyJSON(field[String]("street"), field[String]("zip"))(json) | |
| println(address3) | |
| implicit def addrJSONR: JSONR[Address] = Address.applyJSON(field[String]("street"), field[String]("zip")) | |
| val p = parse(""" {"name":"joe","age":34,"address":{"street": "Manhattan 2", "zip": "00223" }} """) | |
| val person1 = Person.applyJSON(field[String]("name"), field[Int]("age"), field[Address]("address"))(p) | |
| println(person1) | |
| def min(x: Int): Int => Result[Int] = (y: Int) => | |
| if (y < x) Fail("min", y + " < " + x) else y.success | |
| def max(x: Int): Int => Result[Int] = (y: Int) => | |
| if (y > x) Fail("max", y + " > " + x) else y.success | |
| type EitherNel[+a] = NonEmptyList[Error] \/ a | |
| val ageValidator1 = Kleisli(field[Int]("age")).mapK[EitherNel, Int](_.disjunction) | |
| val ageValidator2 = {i: Int => (min(18)(i) |@| max(60)(i))((a, _) => a).disjunction} | |
| val ageValidator = ((ageValidator1 >==> ageValidator2).run _).andThen(_.validation) | |
| val person2 = Person.applyJSON(field[String]("name"), ageValidator, field[Address]("address")) | |
| println(person2(p)) | |
| } | |
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