为什么sbt报告“未找到:值PlayScala"? build.sbt工作时，使用Build.scala与?

问题描述

我正在创建一个具有以下结构的多模块sbt项目:

I am creating a multi-module sbt project, with following structure:

<root>
----build.sbt
----project
    ----Build.scala
    ----plugins.sbt
----common
----LoggingModule

LoggingModule是一个Play Framework项目，而common是一个简单的Scala项目.

LoggingModule is a Play Framework project, while common is a simple Scala project.

在plugins.sbt中:

resolvers += "Typesafe repo" at "http://repo.typesafe.com/typesafe/releases/"

addSbtPlugin("com.typesafe.play" % "sbt-plugin" % "2.3.3")

虽然我在build.sbt中拥有此功能，但一切正常，并且可以识别PlayScala:

While I have this in build.sbt, all works fine and it recognises PlayScala:

name := "Multi-Build"

lazy val root = project.in(file(".")).aggregate(common, LoggingModule).dependsOn(common, LoggingModule)

lazy val common = project in file("common")

lazy val LoggingModule = (project in file("LoggingModule")).enablePlugins(PlayScala)

但是，我将其立即放入project/Build.scala而不是如下的"build.sbt":

However as soon I put this in project/Build.scala instead of `build.sbt' as follows:

object RootBuild extends Build {

  lazy val root = project.in(file("."))
    .aggregate(common, LoggingModule)
    .dependsOn(common, LoggingModule)

  lazy val common = project in file("common")
  lazy val LoggingModule = (project in file("LoggingModule")).enablePlugins(PlayScala)

  ...//other settings
}

它生成错误为:

not found: value PlayScala
lazy val LoggingModule = (project in file("LoggingModule")).enablePlugins(PlayScala)
                                                                          ^

如何解决该问题?

推荐答案

这只是缺少的导入内容.

It's just a missing import.

在.sbt文件中，默认情况下会自动导入一些内容:扩展Plugin的对象的内容，以及AutoPlugin s中的(> = 0.13.5)autoImport字段. PlayScala就是这种情况.

In .sbt files, some things are automatically imported by default: contents of objects extending Plugin, and (>= 0.13.5) autoImport fields in AutoPlugins. This is the case of PlayScala.

在Build.scala文件中，将应用常规的Scala导入规则.因此，您必须更加明确地导入内容.在这种情况下，您需要import play.PlayScala(或直接使用.enabledPlugins(play.PlayScala)).

In a Build.scala file, normal Scala import rules apply. So you have to import things a bit more explicitly. In this case, you need to import play.PlayScala (or use .enabledPlugins(play.PlayScala) directly).

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