http://jsonapi.org/ implementation in scala

Features

• Automatic generation of jsonapi json writers with relationship handling for case classes

Requirements

• Tested to work on Scala 2.11.11 or 2.12.3
• Macro paradise plugin. Add addCompilerPlugin("org.scalamacros" % "paradise" % "2.1.0" cross CrossVersion.full) into your build.sbt somewhere

Example

import _root_.spray.json.DefaultJsonProtocol._
import com.qvantel.jsonapi._

implicit val apiRoot: ApiRoot = ApiRoot(None)

@jsonApiResource final case class Employee(id: String, name: String)
@jsonApiResource final case class Company(id: String, name: String, employees: ToMany[Employee])

val acme = Company("1", "acme", ToMany.loaded(Seq(Employee("1", "number one 1"))))

val json = rawOne(acme)
val parsed = readOne[Company](json, Set("employees"))

acme == parsed // true

or see https://github.com/Doikor/jsonapi-scala-example

Known issues

• loop handing on reader side (relationship path has to be given manually)

JsonApiClient

There is a very generic JsonApiClient interface for implementing a simple client interface for handling the http query writing side of this

The subproject "akka-client" has an implementation of this using akka-http

The subproject "http4s-client" has an implementation of this using http4s

Usage

import cats.data.OptionT
import com.qvantel.jsonapi.JsonApiClient

val jac = JsonApiClient.instance // won't work if you don't have an actual implementations stuff in scope. See setup.

val one: IO[Option[BillingAccount]] = jac.one[BillingAccount]("ba1") 
val many: IO[List[BillingAccount]] = jac.many[BillingAccount](Set("ba1", "ba2"))

// can also load includes at the same time
val withIncludes = jac.one[BillingAccount]("ba1", Set("customer-account"))

// includes can also be loaded on their own with a method
val ba: OptionT[IO, BillingAccount]  = OptionT(jac.one[BillingAccount]("ba"))
val ca: OptionT[IO, CustomerAccount] = ba.semiflatMap(_.customerAccount.load)

// filtering support
val filtered = jac.filter[BillingAccount]("some nice filter string here")

Setup

akka-http client

// needs ActorSystem and Materializer for akka-http
// the ApiEndPoint is used to as the "root" where to launch queries
import com.netaporter.uri.dsl._
import akka.actor.ActorSystem
import akka.stream.ActorMaterializer
import com.qvantel.jsonapi.ApiEndpoint
import com.qvantel.jsonapi.JsonApiClient
import com.qvantel.jsonapi.client.akka.AkkaClient._

implicit val system: ActorSystem  = ActorSystem()
implicit val materializer: ActorMaterializer = ActorMaterializer()
implicit val endpoint: ApiEndpoint = ApiEndpoint.Static("http://localhost:8080/api")

val jac = JsonApiClient.instance

http4s client

Setup for http4s client

import com.netaporter.uri.dsl._
import org.http4s.client.Client
import org.http4s.client.blaze.Http1Client
import cats.effect.IO
import com.qvantel.jsonapi.ApiEndpoint
import com.qvantel.jsonapi.JsonApiClient

import com.qvantel.jsonapi.client.http4s.Http4sClient._
import com.qvantel.jsonapi.client.http4s.JsonApiInstances._


implicit val endpoint: ApiEndpoint = ApiEndpoint.Static("http://localhost:8080/api")

implicit val client: Client[IO] = Http1Client[IO]().unsafeRunSync()

val jac = JsonApiClient.instance