reactivemongo

I'm quite new to Play2 and Scala. I'm writing a simple application that uses ReactiveMongo plugin. I wrote a simple object to use as DAO object UserDAO { def db: reactivemongo.api.DB = ReactiveMongoPlugin.db def collection: JSONCollection = db.collection[JSONCollection]("users") collection.indexesManager.ensure(Index(List("name" -> IndexType.Ascending), unique = true)) def insert(User): Future[LastError] = { collection.insert(unit) } def findOne(query: JsObject): Future[Option[User]] = { collection.find(query).one[User] } def removeOne(query: JsObject): Future[LastError] = { collection.remove

Very often, when Play reloads the application after a code change, I receive the following error: MongoError['The node set can not be reached! Please check your network connectivity.'] The MongoDB log looks like this: 2016-09-06T18:51:22.609+0200 I NETWORK [initandlisten] waiting for connections on port 27017 2016-09-06T18:53:49.916+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60559 #1 (1 connection now open) 2016-09-06T18:53:51.185+0200 I NETWORK [initandlisten] connection accepted from 127.0.0.1:60561 #2 (2 connections now open) 2016-09-06T18:53:51.196+0200 I NETWORK

I'm getting a: No Json deserializer found for type Option[reactivemongo.bson.BSONObjectID]. Try to implement an implicit Reads or Format for this type. When trying to deserialise my review object. Review: case class Review(override var id: Option[BSONObjectID] = None, override var createdAt: Option[DateTime] = None, override var updatedAt: Option[DateTime] = None, grade: Int, text: String, originIPAddress: Option[String], status: ReviewStatus, origin: ReviewOrigin, rId: Option[Long], userId: Option[Long] ) extends TemporalModel object Review { import mongo_models.enums.EnumFormat._ implicit

Here below is the code for updating a document with Mongo's FindAndModify : val selector = BSONDocument("id" -> "1234") val modifier = BSONDocument("$set" -> BSONDocument("email" -> "new@domain.com")) ReactiveMongoPlugin.db.command(FindAndModify( collection.name, selector, Update(modifier, false), false, None )).transform( success => success.map { s => // doesn't work... Json.fromJson[Seq[JsValue]](toJson(s)).map(for (item <- _) yield item).get }.getOrElse(List[JsValue]()), failure => failure match { case e: LastError => DaoServiceException(e.message, Some(DATABASE_ERROR)) } ) In the success

Play 2: https://playframework.com ReactiveMongo: http://reactivemongo.org 代码在： http://git.oschina.net/socialcredits/social-credits-activity-service 公司要做一些活动，需要一个线上的活动报名应用。想着前几天刚好看了下 ReactiveMongo ，觉得这个小应用正好练练手。 这个活动应用的功能非常简单：用户在线填写表单，提交表单，后台存储数据并向指定的专员发送邮箱通知。 Play 项目 整个项目目录结构如下： ├── app │ ├── controllers │ │ └── inapi │ ├── utils │ └── views │ └── activity ├── conf ├── data │ └── src │ └── main ├── platform │ └── src │ └── main ├── project ├── static │ └── src │ └── site └── util └── src ├── main app 、 conf 都是 Play 的标准目录，分别放置代码文件和项目配置文件。 app.views 包下的是Play的模板页面文件。 static 是用于放置前端源文件的，包括： js 、

Reading the documentation about the Play Framework and ReactiveMongo leads me to believe that ReactiveMongo works in such a way that it uses few threads and never blocks. However, it seems that the communication from the Play application to the Mongo server would have to happen on some thread somewhere . How is this implemented? Links to the source code for Play, ReactiveMongo, Akka, etc. would also be very appreciated. The Play Framework includes some documentation about this on this page about thread pools . It starts off: Play framework is, from the bottom up, an asynchronous web framework.

I am trying to find the best approach to sharing the same pool of connection between actors withing the cluster workers. I have the following structure: Master Actor -> Worker Actors(can be up to 100 or more) -> MongoDB Between workers and MongoDB I want to put reactivemongo, however I am not sure how exactly to provide connection pool sharing between all actors. According to reactivemongo documentation: A MongoDriver instance manages an actor system; a connection manages a pool of connections. In general, MongoDriver or create a MongoConnection are never instantiated more than once. You can

Here is an simple JSON I want to write/read to/from MongoDB: { "id": "ff59ab34cc59ff59ab34cc59", "name": "Joe", "surname": "Cocker" } Before storing it in MongoDB, "ff59ab34cc59ff59ab34cc59" has to be transformed into an ObjectID and id renamed to _id ... so given the following Reads , how do I achieve that? val personReads: Reads[JsObject] = ( (__ \ 'id).read[String] ~ // how do I rename id to _id AND transform "ff59ab34cc59ff59ab34cc59" to an ObjectID? (__ \ 'name).read[String] ~ (__ \ 'surname).read[String] ) reduce And of course, I also need the contrary for my Writes , i.e. renaming _id