No Json serializer as JsObject found for type play.api.libs.json.JsObject

The final release of ReactiveMongo 0.11 has been published ("org.reactivemongo" %% "play2-reactivemongo" % "0.11.0.play23").

As indicated on the updated documentation, for the default BSON/JSON conversions, it's recommended to have: import play.modules.reactivemongo.json._, ImplicitBSONHandlers._.

In my case, I was feeding ReactiveMongo (insert) with a JsValue instead than a JsObject. In order to fix it, behind adding import play.modules.reactivemongo.json._, I also had to change my implicit Writes in OWrites:

from

implicit val myWrites: Writes[A] = new Writes[A] {
  def writes(a: A) = Json.obj(...)

to

implicit val myWrites: OWrites[A] = new OWrites[A] {  <-- NOTE THE 'O' before 'Writes'
  def writes(a: A) = Json.obj(...)

Mine worked out after adding: import play.modules.reactivemongo.json._ import play.modules.reactivemongo.json.collection._