我正在尝试使用Play-scala和ReactiveMongo将数据插入MongoDB。
这是我的DbimpService.scala
:
package services
import models.Post
import reactivemongo.bson.BSONDocument
import reactivemongo.api.MongoDriver
import reactivemongo.api.collections.bson.BSONCollection
import scala.concurrent.ExecutionContext
import javax.inject.Inject
import play.api.libs.json.Json
import reactivemongo.play.json.collection.JSONCollection
import reactivemongo.api.commands.WriteResult
import scala.concurrent.Future
import org.apache.xerces.util.DatatypeMessageFormatter
class Dbimpservice @Inject() (implicit ec:ExecutionContext) extends Dbservice {
def create(p:Post):String={
var status = "Not Saved"
val driver = new MongoDriver
val connection = driver.connection(List("localhost"))
val db = connection("application")
val collection = db[BSONCollection]("post")
val futureList = collection.insert[Post](p)
futureList.onComplete { case sucess => println(sucess) }
return status
}
}
这是我的HomeController.scala
:
package controllers
import javax.inject._
import play.api._
import play.api.mvc._
import models._
import scala.util.{ Failure, Success }
import scala.concurrent.Future
import scala.concurrent.ExecutionContext.Implicits.global
import reactivemongo.api.{ MongoDriver, MongoConnection }
import reactivemongo.play.json.collection.JSONCollection
import reactivemongo.bson.BSONDocument
import reactivemongo.api.commands.WriteResult
import reactivemongo.api.collections.bson.BSONCollection
import play.api.libs.json.Json
import services.Dbservice
import services.Dbimpservice
import services.Dbservice
import scala.concurrent.ExecutionContext
import scala.concurrent.Await
import scala.concurrent.duration.Duration
/**
* This controller creates an `Action` to handle HTTP requests to the
* application's home page.
*/
@Singleton
class HomeController @Inject() (implicit ec:ExecutionContext,val Dbservice : Dbimpservice)extends Controller {
/**
* Create an Action to render an HTML page with a welcome message.
* The configuration in the `routes` file means that this method
* will be called when the application receives a `GET` request with
* a path of `/`.
*/
def index = Action{
Ok("Hai")
}
def read = Action.async {
val query = BSONDocument()
val driver = new MongoDriver
val connection = driver.connection(List("localhost:27017"))
val db = connection("application")
val collection = db[BSONCollection]("post")
val futureList = collection.find(query).cursor[Post]().collect[List]()
futureList.map { list =>
Ok(list.toString())
}
}
def create = Action(BodyParsers.parse.json) { request =>
val personResult = request.body.validate[Post]
personResult.fold(
errors => {
BadRequest(Json.obj("status " ->"ERROR"))
},
valid = fun
)
}
def fun:Post => Result= { post =>
var ans = Dbservice.create(post)
Ok(ans)
}
}
我正在尝试插入数据但未插入数据,而我得到的错误是
Failure(reactivemongo.core.errors.ConnectionNotInitialized: MongoError['Connection is missing metadata (like protocol version, etc.) The connection pool is probably being initialized.'])
有人请帮助我,我甚至提到了链接
http://stackoverflow.com/questions/31456517/embedmongo-with-reactivemongo-process-does-not-exit
但没有得到
答案 0 :(得分:2)
猜测您使用的是最新版本的ReactiveMongo(0.11.7+),您使用的是deprecated DB resolution代码(connection(dbName)
又名connection.apply(dbName)
。
您需要使用异步解决方案,它可以从故障转移中受益(以处理可能的网络延迟/事件)。必须重构以下代码。
val db = connection("application")
val collection = db[BSONCollection]("post")
val futureList = collection.insert[Post](p)
使用新的DB resolution:
for {
db <- connection.database("application")
collection = db("post")
res <- collection.insert(p)
} yield res