Example of Multiple Values

[harjitdotsingh]

Hi there,

Can you add an example of multiple values for a vertex ? I know you did it for TinkerPop. I'm trying to add one using java.util.List or Set but I keep getting error

[mpollmeier]

which database do you refer to? can you share what you tried, and what error you're getting?

[harjitdotsingh]

Janus. I will send the Error

[harjitdotsingh]

Here is an example

import java.util

import gremlin.scala._
import org.apache.tinkerpop.gremlin.process.traversal.{P => JavaP}
import org.janusgraph.core.schema.JanusGraphManagement
import org.janusgraph.core.{Cardinality, JanusGraph, JanusGraphVertex}
import org.scalatest.{Matchers, WordSpec}
import scala.collection.JavaConverters._


trait InMemoryConnectScala {
  def connect(): JanusGraph = {
    import org.apache.commons.configuration.BaseConfiguration
    val conf = new BaseConfiguration()
    conf.setProperty("storage.backend", "inmemory")
    val jg = JanusGraphFactory.open(conf)

    jg
  }
}

/* test cases copied from TP3 PTest.java */
class PSpec extends WordSpec with Matchers with InMemoryConnectScala {

  val graph: JanusGraph = connect()
  val mgmt: JanusGraphManagement = graph.openManagement()

  val atomEnergy = createProperty(ACM.atomEnergy.toString, Cardinality.LIST)

  val acm: JanusGraphVertex = graph.addVertex()
  val prop = new util.ArrayList[String]()

  prop.add("2")
  prop.add("3")

  acm.property("atomEnergy", List("1,2,3").asJava)

  val c = acm.properties("atomEnergy")

  c.forEachRemaining(a => println(a))

  println(
    "Quering" + graph
      .V()
      .has(Key[List[String]]("atomEnergy"), P.within(List("2", "3")))
      .has(Key[String]("test"), "Harjit")
      .toList()
      .head
      .property("atomEnergy"))

  def createProperty(str: String, cardinality: Cardinality = Cardinality.SET) = {
    val prop = mgmt.makePropertyKey(str).dataType(classOf[String]).cardinality(cardinality).make
    prop
  }

  case class TestCase[A](predicate: JavaP[A], value: A, expected: Boolean)
}

I get this error

 /media/hsingh/ExtraDrive1/projects/deciphernow/dungeoner/src/test/scala/PSpec.scala:34: type mismatch;
[error]  found   : gremlin.scala.Key[List[String]]
[error]  required: gremlin.scala.Key[java.io.Serializable]
[error] Note: List[String] <: java.io.Serializable, but class Key is invariant in type A.
[error] You may wish to define A as +A instead. (SLS 4.5)
[error]       .has(Key[List[String]](ACM.atomEnergy.toString), P.within(List("2", "3")))
[error]                             ^
[error] /media/hsingh/ExtraDrive1/projects/deciphernow/dungeoner/src/test/scala/PSpec.scala:34: type mismatch;
[error]  found   : org.apache.tinkerpop.gremlin.process.traversal.P[String]
[error]  required: org.apache.tinkerpop.gremlin.process.traversal.P[java.io.Serializable]
[error] Note: String <: java.io.Serializable, but Java-defined class P is invariant in type V.
[error] You may wish to investigate a wildcard type such as `_ <: java.io.Serializable`. (SLS 3.2.10)
[error]       .has(Key[List[String]](ACM.atomEnergy.toString), P.within(List("2", "3")))

Please let me know if I'm doing anything wrong.

[mpollmeier]

I don't have time to fix incomplete code listings. Please share the missing pieces to fix the below compilation errors.

[error] /home/mp/Projects/tinkerpop/gremlin-scala-examples/janusgraph/src/test/scala/PSpec.scala:11:49: not found: type InMemoryConnectScala
[error] class PSpec extends WordSpec with Matchers with InMemoryConnectScala {
[error]                                                 ^
[error] /home/mp/Projects/tinkerpop/gremlin-scala-examples/janusgraph/src/test/scala/PSpec.scala:13:27: not found: value connect
[error]   val graph: JanusGraph = connect()
[error]                           ^
[error] /home/mp/Projects/tinkerpop/gremlin-scala-examples/janusgraph/src/test/scala/PSpec.scala:16:35: not found: value ACM
[error]   val atomEnergy = createProperty(ACM.atomEnergy.toString, Cardinality.LIST)
[error]                                   ^
[error] /home/mp/Projects/tinkerpop/gremlin-scala-examples/janusgraph/src/test/scala/PSpec.scala:24:16: not found: value ACM
[error]   acm.property(ACM.atomEnergy.toString, List("1,2,3").asJava)
[error]                ^
[error] /home/mp/Projects/tinkerpop/gremlin-scala-examples/janusgraph/src/test/scala/PSpec.scala:26:26: not found: value ACM
[error]   val c = acm.properties(ACM.atomEnergy.toString)
[error]                          ^
[error] /home/mp/Projects/tinkerpop/gremlin-scala-examples/janusgraph/src/test/scala/PSpec.scala:33:30: not found: value ACM
[error]       .has(Key[List[String]](ACM.atomEnergy.toString), P.within(List("2", "3")))
[error]                              ^
[error] 6 errors found
[error] (Test / compileIncremental) Compilation failed

[harjitdotsingh]

Sorry about that. Try now . I have fixed it

[mpollmeier]

Ok, the main thing is to replace .has(Key[List[String]]("atomEnergy"), P.within(List("2", "3"))) with .has(Key[String]("atomEnergy"), P.within(List("2", "3"))).

Then, it compiles. I haven't executed it to verify if it's doing the right thing, but there's some working examples e.g. in https://github.com/mpollmeier/gremlin-scala/blob/master/gremlin-scala/src/test/scala/gremlin/scala/ElementSpec.scala#L44