Question

我创建了一个简单的Play-Scala应用程序来测试ReactiveMongo并遇到一个奇怪的异常。这些是步骤：

制作新的Play-scala应用

activator new test-mongo
根据此链接配置application.conf和build.sbt（ http://reactivemongo.org/releases/0.11/documentation/tutorial/play2.html）
修改控制器Application.scala

package controllers

import play.api._
import play.api.mvc._

import javax.inject.Inject

import play.api.mvc.Controller

import scala.concurrent.{ ExecutionContext, Future }
import scala.concurrent.ExecutionContext.Implicits.global

import play.api.Play.current
import play.api.libs.json._

import reactivemongo.bson.BSONDocument
import reactivemongo.api.commands.WriteResult
import reactivemongo.api.Cursor

import play.modules.reactivemongo._
import play.modules.reactivemongo.json._
import play.modules.reactivemongo.json.collection.JSONCollection
import play.modules.reactivemongo.ReactiveMongoApi

class Application @Inject() (val reactiveMongoApi: ReactiveMongoApi)
  extends Controller with MongoController with ReactiveMongoComponents {


  def collection: JSONCollection = db.collection[JSONCollection]("posts")

  def index = Action.async {
    val cursor: Cursor[JsObject] = collection.
      // find all people with name `name`
      find(Json.obj("username" -> "Rob")).
      // sort them by creation date
      sort(Json.obj("created" -> -1)).
      // perform the query and get a cursor of JsObject
      cursor[JsObject]

    // gather all the JsObjects in a list
    val futurePersonsList: Future[List[JsObject]] = cursor.collect[List]()

    // transform the list into a JsArray
    val futurePersonsJsonArray: Future[JsArray] =
      futurePersonsList.map { persons => Json.arr(persons) }

    // everything's ok! Let's reply with the array
    futurePersonsJsonArray.map { persons =>
      // Ok(views.html.index("Your new application is ready." + persons))
      Ok(persons)
    }
  }

}

运行应用程序并浏览应用程序页面。首次运行时，将出现以下异常。刷新页面，将显示数据。

[DetailedDatabaseException: DatabaseException['not authorized for query on posts.posts' (code = 13)]]

以下显示所用软件的版本：

Scala: 2.11.6 
Play: 2.4 
Mongo: 3.0.7
ReactiveMongo: 0.11.9

Answer 1

使用play2-reactivemongo 0.12.0-SNAPSHOT时问题解决了。但是，每次运行之前都必须“清理”代码。

使用Scala Play 2.4 ReactiveMongo的DatabaseException

1 个答案: