clusterSettings不是com.mongodb.MongoClientSettings.Builder的成员

Question

我正在尝试使用scala中的mongodb客户端.我使用IntelliJ IDEA.

在这一行:

val settings: MongoClientSettings = MongoClientSettings
                                             .builder()
                                             .clusterSettings(clusterSettings)
                                             .build()

我收到错误:

clusterSettings不是com.mongodb.MongoClientSettings.Builder的成员

虽然依赖和导入似乎是正确的.

这是sbt文件:

scalaVersion := "2.11.12"
libraryDependencies += "org.mongodb.scala" %% "mongo-scala-driver" % "2.3.0"
libraryDependencies += "org.mongodb" % "mongodb-driver-core" % "3.7.0"

这里包括:

import com.mongodb.ServerAddress
import org.mongodb.scala.MongoClientSettings
import org.mongodb.scala.connection.ClusterSettings

似乎没有人在互联网上出现这个问题,但我的同事最近也遇到了同样的问题.任何想法在这里有什么问题？

更新:

根据罗斯的评论我修改了sbt:

scalaVersion := "2.11.12"
libraryDependencies += "org.mongodb.scala" %% "mongo-scala-driver" % "2.3.0"

并修改代码:

import com.mongodb.connection.ClusterSettings
import org.mongodb.scala.MongoClientSettings

val settings: MongoClientSettings = MongoClientSettings
  .builder()
  .applyToClusterSettings((b: ClusterSettings.Builder) => b.applySettings(clusterSettings))
  .build()

现在IDEA没有抱怨,它看到所有的API,但在编译期间我得到错误:

错误:(9,60)类型不匹配; 发现:com.mongodb.connection.ClusterSettings.Builder => com.mongodb.connection.ClusterSettings.Builder required:com.mongodb.Block [com.mongodb.connection.ClusterSettings.Builder] .applyToClusterSettings((b:ClusterSettings.Builder) => b.applySettings(clusterSettings))

但是如果我在外面定义块然后使用它 - 它成功编译:

 val block: Block[ClusterSettings.Builder] = new Block[ClusterSettings.Builder] {
  override def apply(t: ClusterSettings.Builder): Unit = {
    t.applySettings(clusterSettings)
  }
}

val settings: MongoClientSettings = MongoClientSettings
  .builder()
  .applyToClusterSettings(block)
  .build()

可能是什么原因？

Answer 1

2.3.0中的类型别名发生了更改,MongoClientSettings并且与上一个构建器的API略有不同.请参阅升级指南:http://mongodb.github.io/mongo-scala-driver/2.3/upgrade/#mongoclientsettings

它被改变的原因是因为它com.mongodb.async.client.MongoClientSettings被弃用而不是新的集中式MongoClientSettings.

您现在仍可以使用已弃用的设置.更新(刷新)你的sbt项目,intellij将突出显示clusterSettings构建器上缺少方法.

将设置应用于新的示例MongoClientSettings:

import com.mongodb.connection.ClusterSettings

// Scala 2.12 (support for Single Abstract Methods)
val clientSettings: MongoClientSettings = MongoClientSettings
      .builder()
      .applyToClusterSettings((b: ClusterSettings.Builder) => b.applySettings(clusterSettings))
      .build()

// Scala 2.11 you must provide the block:
val clientSettings: MongoClientSettings = MongoClientSettings
      .builder()
      .applyToClusterSettings(new Block[ClusterSettings.Builder]() {
        override def apply(b: ClusterSettings.Builder): Unit = b.applySettings(clusterSettings)
      })
      .build()