How to write documents to MongoDB using ReactiveMongo transactions? - mongodb

Question

I am trying to run this simple code, which insert a document to "reports" collection under transaction.
This is the code:
def runWithTransaction(): Future[Unit] = {
for {
dbWithSession <- db.db.startSession()
dbWithTx <- dbWithSession.startTransaction(None)
reportsCollection = dbWithTx.collection[JSONCollection]("reports")
_ <- reportsCollection.insert.one(BSONDocument("id" -> "123123"))
_ <- dbWithTx.commitTransaction()
_ <- dbWithSession.endSession()
} yield ()
}
I am getting the following error:
play.api.libs.json.JsResultException: JsResultException(errors:List((,List(JsonValidationError(List(CommandError[code=14, errmsg=BSON field 'OperationSessionInfo.txnNumber' is the wrong type 'int', expected type 'long', doc: {"operationTime":{"$time":1573135213,"$i":1,"$timestamp":{"t":1573135213,"i":1}},"ok":0,"errmsg":"BSON field 'OperationSessionInfo.txnNumber' is the wrong type 'int', expected type 'long'","code":14,"codeName":"TypeMismatch","$clusterTime":{"clusterTime":{"$time":1573135213,"$i":1,"$timestamp":{"t":1573135213,"i":1}},"signature":{"hash":{"$binary":"0000000000000000000000000000000000000000","$type":"00"},"keyId":0}}}]),WrappedArray())))))
at reactivemongo.play.json.JSONSerializationPack$.deserialize(JSONSerializationPack.scala:61)
at reactivemongo.play.json.JSONSerializationPack$.deserialize(JSONSerializationPack.scala:33)
at reactivemongo.api.commands.Command$$anon$2.$anonfun$one$6(commands.scala:141)
at scala.concurrent.Future$.$anonfun$apply$1(Future.scala:658)
at scala.util.Success.$anonfun$map$1(Try.scala:255)
at scala.util.Success.map(Try.scala:213)
at scala.concurrent.Future.$anonfun$map$1(Future.scala:292)
at scala.concurrent.impl.Promise.liftedTree1$1(Promise.scala:33)
at scala.concurrent.impl.Promise.$anonfun$transform$1(Promise.scala:33)
at scala.concurrent.impl.CallbackRunnable.run(Promise.scala:64)
at akka.dispatch.BatchingExecutor$AbstractBatch.processBatch(BatchingExecutor.scala:55)
at akka.dispatch.BatchingExecutor$BlockableBatch.$anonfun$run$1(BatchingExecutor.scala:92)
at scala.runtime.java8.JFunction0$mcV$sp.apply(JFunction0$mcV$sp.java:23)
at scala.concurrent.BlockContext$.withBlockContext(BlockContext.scala:85)
at akka.dispatch.BatchingExecutor$BlockableBatch.run(BatchingExecutor.scala:92)
at akka.dispatch.TaskInvocation.run(AbstractDispatcher.scala:41)
at akka.dispatch.ForkJoinExecutorConfigurator$AkkaForkJoinTask.exec(ForkJoinExecutorConfigurator.scala:49)
at akka.dispatch.forkjoin.ForkJoinTask.doExec(ForkJoinTask.java:260)
at akka.dispatch.forkjoin.ForkJoinPool$WorkQueue.runTask(ForkJoinPool.java:1339)
at akka.dispatch.forkjoin.ForkJoinPool.runWorker(ForkJoinPool.java:1979)
at akka.dispatch.forkjoin.ForkJoinWorkerThread.run(ForkJoinWorkerThread.java:107)
I am using:
scala 2.12
"org.reactivemongo" % "play2-reactivemongo_2.12" % "0.18.8-play27"
MongoDB version 4.2.1 (its actually a replica set with 1 primary)
Any help is appreciated, thanks.

Answer 1

Use this code to Insert:
def insert(coll: BSONCollection, document: BSONDocument): Future[Unit] = {
val writeRes: Future[WriteResult] = coll.insert.one(document)
writeRes.onComplete { // Dummy callbacks
case Failure(e) => e.printStackTrace()
case Success(writeResult) =>
println(s"successfully inserted document with result: $writeResult")
}
writeRes.map(_ => {}) // in this example, do nothing with the success
}
And If you want to update, use this:
def update(collection: BSONCollection, item_id: Long, modifier: BSONDocument) = {
val selector = BSONDocument("_id" -> item_id)
println("selector ===" + selector)
val futureUpdate = collection.update.one(
q = selector, u = modifier,
upsert = true, multi = false)
futureUpdate.onComplete { // Dummy callbacks
case Failure(e) => e.printStackTrace()
case Success(writeResult) =>
println(s"successfully updated document with result: $writeResult")
}
}