Having trouble with Labelled Edge implicits

[Tim Barclay]

I'm having some trouble understanding the section about Labelled Edges at http://www.scala-graph.org/guides/core-initializing.html. I have the following code:

import scalax.collection.Graph
import scalax.collection.edge.Implicits._
import scalax.collection.edge.LBase.LEdgeImplicits

sealed abstract class Relationship(name: String)
case object A extends Relationship("A")
object RelImplicits extends LEdgeImplicits[Relationship]
import RelImplicits._

case class NodeType(id: Int)
val a = NodeType(1)
val b = NodeType(2)

val g = Graph((a ~+#> b)(A))

g.edges.headOption map(_.name) // error: value name is not a member of g.EdgeT
g.edges.headOption map(_.label.name) // error:value nameisnot a member ofscalax.collection.edge.LkDiEdge[NodeT]#L1

What's causing those last two lines not to compile? As far as I can see I'm doing effectively the same thing as on the core-initializing page.

[Peter Empen]

Hi Tim,

I guess the issue is simply that name has no getter...

Peter

[Tim Barclay]

Ah, you're quite right of course, it was my own ineptitude. Thanks for noticing that, it works if I change Relationship to

sealed abstract class Relationship(val name: String)

[empen...@gmail.com]

Btw, predefined labeled edges have been superseded by easy-to-define custom edges in version 2.