Neo4J - pass List[String] into query and UNWIND - scala

Question

I am trying to pass a List[String] into a query and then match on possibly multiple nodes by a property, where the value of the property is the string passed into the query.
I get an error - Expected parameter(s): list
import org.neo4j.driver.v1._
def getNodesByPropertyValue(list: List[String]): Future[List[(String, String)]] = {
val getNodes =
s"""
| UNWIND $$list AS propValue
| MATCH (i: item {id: propValue})<-[:CONTAINS]-(c: Collection)
| RETURN i.originalID AS OID
|""".stripMargin
storeAPI.NeoQuery(getNodes).resultList().map {
result =>
result.map {
record =>
record.get("OID").toString
}
}).recoverWith {
case e: Exception =>
logger.error(s"Failure in getNodesByProperty: ", e)
throw e
}
}
Also, when I use $list instead, I get an error saying Neo4J doesn't recognise the function List().
A solution to this would be appreciated.
Also, what is the difference between passing a variable with $ into a query, than passing a variable with $$? I thought the $$ might be used for collections but I am unsure, I haven't found information on it yet.
Thanks.

Answer 1

In my storeAPI.NeoQuery I was missing the parameter that maps the string $$list in the query, to the val list outside of the query.
Working version below.
import org.neo4j.driver.v1._
def getNodesByPropertyValue(list: List[String]): Future[List[(String, String)]] = {
val getNodes =
s"""
| UNWIND $$list AS propValue
| MATCH (i: item {id: propValue})<-[:CONTAINS]-(c: Collection)
| RETURN i.originalID AS OID
|""".stripMargin
storeAPI.NeoQuery(getNodes, Map("list" -> list.asJava)).resultList().map {
result =>
result.map {
record =>
record.get("OID").toString
}
}).recoverWith {
case e: Exception =>
logger.error(s"Failure in getNodesByProperty: ", e)
throw e
}
}