Generic DAO with formater

[Nicolas Esteban]

HI,

I'm trying to implement a generic DAO with find, insert and update methods.

The problem is I don't know what is the json formater of generic class, and this code can't work :

def find(uuid:UUID): Future[Option[A]] =
  collection.find(Json.obj("uuid" -> uuid)).one[A]

I got this error :

No Json deserializer found for type A. Try to implement an implicit Reads or Format for this type.

    collection.find(Json.obj("uuid" -> uuid)).one[A]

Is there a trick to do that ? May be Inject a formater ...

Thanks in advance

[Cédric Chantepie]

Hi,

This is not specific to ReactiveMongo.

Your function must be defined as following: def find(uuid:UUID)(implicit r: Reads[A]): Future[Option[A]]

I suggest you first have a look at the Playframework JSON documentation.