CODEWITHSUNDEEP
scalacompiler-errorslift
Mark Goldenstein
Mark Goldenstein

Reputation: 482

Scala Lift: Box openOr does not seem to work

I am following the "Exploring Lift" book and I've tried one of their example Snippets - the only difference here is that I don't use the MegaProtoUser class but instead rolled my own one. However, I get the following problem.

Here is my Snippet:

User.currentUser.map(user =>
  user.projects.flatMap(project => {
    bind("e", chooseTemplate("project", "entry", in),
      "name" -> Text(project.name.is),
      "actions" -> {
        SHtml.link("/manageProjects", () => project.delete_!, Text("Delete")) ++ Text(" ") ++
          SHtml.link("/editProject", () => currentAccountVar(project), Text("Edit"))
      })
  })) openOr Text("You are not logged in.")

And here are the compiler errors:

inferred type arguments [Seq[scala.xml.Node]{def seq: Seq[scala.xml.Node]{def companion: scala.collection.generic.GenericCompanion[Seq[Any]]}; def companion: scala.collection.generic.GenericCompanion[Seq[Any]]}] do not conform to method openOr's type parameter bounds [B >: scala.collection.mutable.Buffer[scala.xml.Node]]  

type mismatch;  found   : scala.xml.Text  required: Seq[scala.xml.Node]{def seq: Seq[scala.xml.Node]{def companion: scala.collection.generic.GenericCompanion[Seq[Any]]}; def companion: scala.collection.generic.GenericCompanion[Seq[Any]]}

If I replace openOr Text("You are not logged in.") with open_! then it works.

Why can't I use openOr in this context, what does this error mean? And what's the proper way to do it?

Upvotes: 1

Views: 571

Answers (1)

Kim Stebel
Kim Stebel

Reputation: 42037

The error means the compiler wants a sequence but found a single element. Try

 List(Text(....))

instead of just

Text(....)

Upvotes: 2

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