MongoDB写操作的ConnectionNotInitialized异常

Question

我有两个Docker容器：

1. 运行MongoDB
2. 使用ReactiveMongo连接到所述MongoDB的服务

我用来连接MongoDB的代码：

array_search($post_title, 
     array_map(function($object) {
             return $object->post_title;
         },
         $yourArray
     )
);

连接似乎很好，因为我可以毫无问题地阅读它。但是一旦我尝试插入或更新文档，我就会遇到以下异常：

trait MongoHelper {
  this: BaseConfig =>

  val dbKey: String
  val collKey: String
  lazy val mongoConfig = persistenceConfig.getConfig( dbKey )
  lazy val servers = persistenceConfig.getStringList( s"$dbKey.servers" ).asScala
  lazy val database = persistenceConfig.getString( s"$dbKey.database" )
  lazy val username = persistenceConfig.getString( s"$dbKey.username" )
  lazy val password = persistenceConfig.getString( s"$dbKey.password" )
  lazy val credentials = Seq( Authenticate( database, username, password ) )


  lazy val conOpts = MongoConnectionOptions( authSource = Some( database ), authMode = ScramSha1Authentication )

  lazy val driver = new MongoDriver
  lazy val connection = driver.connection( servers, authentications = credentials, options = conOpts )

  lazy val db = connection( database )

}

但这对我没有意义，必须初始化连接池，因为我正在使用它来从数据库中读取。