From 0ca4befab8aceb8008ffa3c7afc472528232f717 Mon Sep 17 00:00:00 2001
From: Stewart Stewart <stewinsalot@gmail.com>
Date: Tue, 31 Jan 2017 23:22:59 -0500
Subject: serialize date to ISO string rather than object

---
 src/main/scala/xyz/driver/core/json.scala     | 21 +++++++++++----------
 src/test/scala/xyz/driver/core/JsonTest.scala |  6 +-----
 2 files changed, 12 insertions(+), 15 deletions(-)

diff --git a/src/main/scala/xyz/driver/core/json.scala b/src/main/scala/xyz/driver/core/json.scala
index 039f650..9a7672e 100644
--- a/src/main/scala/xyz/driver/core/json.scala
+++ b/src/main/scala/xyz/driver/core/json.scala
@@ -7,14 +7,12 @@ import akka.http.scaladsl.unmarshalling.Unmarshaller
 import spray.json.{DeserializationException, JsNumber, _}
 import xyz.driver.core.revision.Revision
 import xyz.driver.core.time.Time
-import xyz.driver.core.date.{Date, Month}
+import xyz.driver.core.date.Date
 
 import scala.reflect.runtime.universe._
 
 object json {
 
-  import DefaultJsonProtocol._
-
   def IdInPath[T]: PathMatcher1[Id[T]] = new PathMatcher1[Id[T]] {
     def apply(path: Path) = path match {
       case Path.Segment(segment, tail) => Matched(tail, Tuple1(Id[T](segment)))
@@ -69,16 +67,19 @@ object json {
     }
   }
 
-  implicit val monthFormat = new RootJsonFormat[Month] {
-    def write(month: Month) = JsNumber(month)
-    def read(value: JsValue): Month = value match {
-      case JsNumber(month) if 0 <= month && month <= 11 => date.tagMonth(month.toInt)
-      case _                                            => throw DeserializationException("Expected a number from 0 to 11")
+  implicit val dateFormat = new JsonFormat[Date] {
+    def write(date: Date) = JsString(date.toString)
+    def read(value: JsValue): Date = value match {
+      case JsString(dateString) =>
+        Date
+          .fromString(dateString)
+          .getOrElse(
+            throw new DeserializationException(
+              s"Misformated ISO 8601 Date. Expected YYYY-MM-DD, but got $dateString."))
+      case _ => throw new DeserializationException(s"Date expects a string, but got $value.")
     }
   }
 
-  implicit val dateFormat = jsonFormat3(Date.apply)
-
   def RevisionInPath[T]: PathMatcher1[Revision[T]] =
     PathMatcher("""[\da-fA-F]{8}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{4}-[\da-fA-F]{12}""".r) flatMap { string =>
       Some(Revision[T](string))
diff --git a/src/test/scala/xyz/driver/core/JsonTest.scala b/src/test/scala/xyz/driver/core/JsonTest.scala
index 821b162..ff804a9 100644
--- a/src/test/scala/xyz/driver/core/JsonTest.scala
+++ b/src/test/scala/xyz/driver/core/JsonTest.scala
@@ -48,11 +48,7 @@ class JsonTest extends FlatSpec with Matchers {
     val referenceDate = Date(1941, Month.DECEMBER, 7)
 
     val writtenJson = json.dateFormat.write(referenceDate)
-    writtenJson.prettyPrint should be("""|{
-                                         |  "year": 1941,
-                                         |  "month": 11,
-                                         |  "day": 7
-                                         |}""".stripMargin)
+    writtenJson.prettyPrint should be("\"1941-12-07\"")
 
     val parsedDate = json.dateFormat.read(writtenJson)
     parsedDate should be(referenceDate)
-- 
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