Scalatra -找不到:对象缩放

Question

上下文：--我第一次看到Scalatra。我遵循斯卡帕特拉行动和样例代码回购提供的指示。我能够获得一个使用g8创建的模板项目。当我更新PageController文件中的代码并启动jetty服务器时，我会得到一些非常奇怪的错误消息，参见下面。

c:\Users\eric.barnes\Desktop\scalatra-cms>sbt
[info] welcome to sbt
1.4.5 (Oracle Corporation Java 16.0.2) 
[info] loading global plugins from C:\Users\eric.barnes\.sbt\1.0\plugins 
[info] loading settings for project scalatra-cms-build from plugins.sbt ... 
[info] loading project definition from C:\Users\eric.barnes\Desktop\scalatra-cms\project 
[info] loading settings for project hello from build.sbt ... 
[info] set current project to Scalatra CMS (in build 
  file:/C:/Users/eric.barnes/Desktop/scalatra-cms/) 
[info] sbt server started at local:sbt-server-dc962f233e7070ae620d 
[info] started sbt server sbt:Scalatra CMS> ~jetty:start [info] compiling 1 Scala source to 
  C:\Users\eric.barnes\Desktop\scalatra-cms\target\scala-2.13\classes ... 
[error] C:\Users\eric.barnes\Desktop\scalatra- 
  cms\src\main\scala\com\example\cms\PageController.scala:4:8: not found: object scalate 
[error] import scalate.ScalateSupport [error]        ^ 
[error] C:\Users\eric.barnes\Desktop\scalatra- 
  cms\src\main\scala\com\example\cms\PageController.scala:6:31: not found: type 
  ScalatraCmsStack [error] class PagesController extends ScalatraCmsStack { 
[error]                               ^ 
[error] C:\Users\eric.barnes\Desktop\scalatra- 
  cms\src\main\scala\com\example\cms\PageController.scala:8:3: not found: value get 
[error]   get("/pages/:slug") { 
[error]   ^ 
[error] C:\Users\eric.barnes\Desktop\scalatra- 
  cms\src\main\scala\com\example\cms\PageController.scala:9:5: not found: value contentType 
[error]     contentType="text/html" 
[error]     ^ 
[error] C:\Users\eric.barnes\Desktop\scalatra- 
  cms\src\main\scala\com\example\cms\PageController.scala:10:35: not found: value params 
[error]     PageDao.pages find (_.slug == params("slug")) match { 
[error]                                   ^ 
[error] C:\Users\eric.barnes\Desktop\scalatra- 
  cms\src\main\scala\com\example\cms\PageController.scala:11:26: not found: value ssp 
[error]       case Some(page) => ssp("/pages/show", "page" -> page) 
[error]                          ^ 
[error] 6 errors found [error] (Compile / compileIncremental) Compilation failed 
[error] Total time: 2 s, completed Oct 4, 2021, 10:51:45 AM [info] 1. Monitoring source files 
  for hello/jetty:start... [info]    Press <enter> to interrupt or '?' for more options.

问题：--这里的错误消息传递--对于第一次使用Scalatra来说有点令人困惑。我在PageController回购中使用相同的代码，所以为什么我会看到这些错误，以及如何解决这些错误？看起来，我的shell不承认scalate库是一个现有的库，但据我理解，scalate随scalatra一起安装包，所以我很困惑。

Answer 1

要在Scalatra项目中使用Scalate (Scala中的模板引擎)，必须向构建文件添加以下依赖项：

"org.scalatra" %% "scalatra-scalate" % ScalatraVersion

您可以在：https://github.com/scalatra/scalatra-in-action/blob/master/chapter02/project/build.scala上看到示例项目的构建配置

顺便说一句，Scalatra in Action是一本以Scalatra 2.4为基础的老书，而Scalatra的最新主要版本是2.8。尽管这本书中的大多数主题对于Scalatra 2.8仍然有效，但Scalatra 2.8中已经不再支持标度支持。我们建议在Scalata2.8中使用转圈而不是Scalate。