How to manage multiple interdependent modules with SBT and IntelliJ IDEA?

Question

I\'m developing several modules with dependencies among them, and would like to work with them all together in one IDEA project. I\'m using sbt-idea to generate IDEA projects f

Answer 1

It seems to be an sbt restriction that the subprojects must live in subdirectories of the master project (i.e., file("../foo") is not allowed). This is not really what I want (what if a module--such as a "utils" or "commons" package--is used in two different master projects?) but I can live with it.

With sbt 13.5 and intellij 13.x, you can specify inter-project dependency with relative path, using a Build.scala. Let's say you have two projects, a core project commons and another project foo, both living in a common directory code/

1. create Build.scala under code/foo/project/

2. put this code snippet insde Build.scala

   object ProjectDependencies {
       val commons = RootProject(file("../commons"))
   }
   
   object ProjectBuild extends Build {
       import ProjectDependencies._
   
       lazy val root = Project(id = "foo", base = file(".")).dependsOn(commons)
   }
   

3. Generate your IntelliJ project via sbt by sbt gen-idea