Getting file contents from GridFS

[Tommi H.]

Hi,

(I already posted this question to Play Framework's Google Group, but perhaps it will get more attention here.)

Are there any up-to-date examples on how to use ReactiveMongo and GridFS to read file contents from MongoDB? I need to do exactly that in a Play 2.3.x project I'm working on, but I need to do it outside a controller, so I cannot use MongoController helpers of Play-ReactiveMongo plugin.

I found this surprisingly hard and documentation a bit scarce. Basically I just need to access a file, with a query, and then grab its contents somehow.

Thanks for any help in advance!

Tommi

[Stephane Godbillon]

Hi,

You're right, there is a hole in the documentation in 0.10 regarding GridFS.

Anyway, here is an example of using gridfs without the play helpers.

import reactivemongo.api.gridfs.GridFS

import reactivemongo.api.gridfs.Implicits.DefaultReadFileReader

val gridFS = new GridFS(db)

// file selector

val query = BSONDocument("_id" -> new BSONObjectID(id))

// query files, and return a Future[Option[DefaultReadFile]]

val maybeFile = gridFS.find(query).headOption

maybeFile.map {

  case Some(file) =>

    // you can call gfs.enumerate(file) to get an Enumerator[Array[Byte]], and then consume it by applying it to an Interatee.

  case None =>

    // ...

}

Hope that it helps.

Cheers,

-- Stephane Godbillon

Blog: http://stephane.godbillon.com

Twitter: https://twitter.com/sgodbillon

Github: https://github.com/sgodbillon

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[Rajesh Bansal]

how to implement it for playframework 2.3.x java ,i am using this 

  String type = "image/" + NewUser.fileExtension(file.getName());

        System.out.println("type"+type);

       newUser.photo = new Blob(file, type);

but getting null pointer exception ,photo is present but still exception comes .please help me