Sending actor data to MQTT

app/models/models.scala

@@ -1,5 +1,7 @@
 package models
 
+import play.api.libs.json.{JsValue, Json, Writes}
+
 import java.time.Instant
 
 case class User(id: Option[Int], username: String, gid: String, passwordDigest: Option[String])
@@ -9,4 +11,16 @@ case class AuthToken(id: Option[Int], userId: Int, token: String, createdAt: Ins
 case class Auction(id: Option[Int], name: String, gid: String, authorId: Int,
                    startingPrice: BigDecimal, currentBid: Option[BigDecimal],
                    currentBidderId: Option[Int], currentBidAt: Option[Instant],
-                   createdAt: Instant)
+                   createdAt: Instant)
+
+object Auction {
+  implicit val writes: Writes[Auction] = (a: Auction) => Json.obj(
+    "id" -> a.id,
+    "name" -> a.name,
+    "gid" -> a.gid,
+    "starting_price" -> a.startingPrice,
+    "current_bid" -> a.currentBid,
+    "current_bidder_id" -> a.currentBidderId,
+    "current_bid_at" -> a.currentBidAt
+  )
+}