2.11 compat

j · j · commit 05f217bd9595 · 2017-04-13T14:45:19.000-07:00
diff --git a/build.sbt b/build.sbt
@@ -1,6 +1,11 @@
+scalaVersion := "2.12.1"
+
+crossScalaVersions := Seq(
+  "2.11.8"
+)
+
 lazy val commonSettings = Seq(
   organization := "org.zalando",
-  scalaVersion := "2.12.1",
   scalacOptions ++= Seq("-feature", "-unchecked", "-deprecation")
 )
 
diff --git a/circe/src/main/scala/org/zalando/jsonapi/json/circe/CirceJsonapiRootObjectWriter.scala b/circe/src/main/scala/org/zalando/jsonapi/json/circe/CirceJsonapiRootObjectWriter.scala
@@ -12,6 +12,13 @@ import io.circe.Decoder, Decoder.Result
 import scala.collection.immutable.ListMap
 
 trait CirceJsonapiRootObjectWriter extends JsonapiRootObjectWriter[Json] {
+  // proxying Decoder.Result with transparent right biasing for scala 2.11
+  implicit class CrossVersionResult[R](result: Either[DecodingFailure, R]) {
+
+    def map[Y](f: (R) ⇒ Y): Either[DecodingFailure, Y] = result.right.map(f)
+    def flatMap[AA >: DecodingFailure, Y](f: (R) ⇒ Either[AA, Y]): Either[AA, Y] = result.right.flatMap(f)
+  }
+
   def writeValue(json: Json): Value = {
     json.fold[Value](
       NullValue,
