[gridfs] Type mismatch (DefaultFileToSave and FileToSave)

[Gaëtan Rizio]

Hello everyone,

I would like to use GridFS of reactivemongo, but I have an error at compile time.

My code is:

// Usage of Source from Akka Stream and Http, transformed into Enumerator

case InsertFileInfo(uploadInfo: UploadInfo, id: BSONObjectID, gfs: GridFS[_]) =>

val enumerator: Enumerator[Array[Byte]] = StreamUtils.sourceToEnumerator(uploadInfo.httpEntity.dataBytes).map(_.toArray[Byte])

val fileToSave: DefaultFileToSave = DefaultFileToSave(

  id.stringify,

  contentType = Some(uploadInfo.httpEntity.contentType.toString())

)

gfs.save(enumerator, fileToSave)

When I compile (in my IDE or with sbt), I end up with following error on last line:

type mismatch;
found   : reactivemongo.api.gridfs.DefaultFileToSave
required: reactivemongo.api.gridfs.FileToSave[gfs.pack.type,?]

I do not understand the error because DefaultFileToSave is a subtype of FileToSave.

If I use the code from https://github.com/ReactiveMongo/ReactiveMongo/blob/master/driver/samples/GridFSSample.scala (see below), I also end up with the same error.

// metadata for the file we are going to put in the store

val metadata = DefaultFileToSave(

  "mongodb-osx-x86_64-2.4.0-rc3.tgz",

  contentType = Some("application/x-compressed"))

// enumerator of the file contents

val enumerator = Enumerator.fromFile(new File("/Users/sgo/Downloads/mongodb-osx-x86_64-2.4.0-rc3.tgz"))

// ok, save the file and attach a callback when the operation is done

gfs.save(enumerator, metadata).onComplete {

  case Success(file) =>

    println(s"successfully saved file of id ${file.id}")

  case Failure(e) =>

    println("exception while saving the file!")

    e.printStackTrace()

}

Thank you for your help.

[Cédric Chantepie]

You can have a look at the examples in the compiled documentation http://reactivemongo.org/releases/0.11/documentation/tutorial/play2.html#helpers-for-gridfs or in the tests https://github.com/ReactiveMongo/ReactiveMongo/blob/master/driver/src/test/scala/GridfsSpec.scala .

[Gaëtan Rizio]

I do not use play, so I cannot use helpers from the first link.

I downloaded the ReactiveMongo project, and I have the exact same error.

Thank you for your answer.