libraryDependencies += "com.github.louis-forite" %% "dynamo-ast" % "0.3"
resolvers += "Sonatype OSS Snapshots" at "https://oss.sonatype.org/content/repositories/releases"

import cats.implicits._
import dynamo.ast.reads.DynamoRead
import dynamo.ast.reads.DynamoRead.read
import dynamo.ast.writes.DynamoWrite
import dynamo.ast.writes.DynamoWrite._

case class Student(id: String, firstName: String, lastName: Option[String])

object Student {
  implicit val studentRead: DynamoRead[Student] =
    (read[String].at("id"),
      read[String].at("firstName"),
      readOpt[String].at("lastName")) mapN Student.apply

   implicit val studentWrite: DynamoWrite[Student] =
    (write[String].at("id"),
        write[String].at("firstName"),
        writeOpt[String].at("lastName")) contramapN(s => (s.id, s.firstName, s.lastName))
}

val dynamoStudent = M(List(
      "id" -> S("id-1"),
      "firstName" -> S("John"),
      "lastName" -> S("Doe")))

DynamoRead[Student].read(dynamoStudent) //will yield DynamoReadSuccess(Student("id-1", "John", Some("Doe")))

val student = Student("id-1", "John", Some("Doe"))
DynamoWrite[Student].write(student) //will yield M(List("id" -> S("id-1"), "firstName" -> S("John"), "lastName" -> S("Doe")))