phantom cassandra multiple tables throw exceptions - scala

Question

I'm using phantom to connect cassandra in play framework. Created the first class following the tutorial. Everything works fine.
case class User(id: String, page: Map[String,String])
sealed class Users extends CassandraTable[Users, User] {
object id extends StringColumn(this) with PartitionKey[String]
object page extends MapColumn[String,String](this)
def fromRow(row: Row): User = {
User(
id(row),
page(row)
)
}
}
abstract class ConcreteUsers extends Users with RootConnector {
def getById(page: String): Future[Option[User]] = {
select.where(_.id eqs id).one()
}
def create(id:String, kv:(String,String)): Future[ResultSet] = {
insert.value(_.id, id).value(_.page, Map(kv)).consistencyLevel_=(ConsistencyLevel.QUORUM).future()
}
}
class UserDB(val keyspace: KeySpaceDef) extends Database(keyspace) {
object users extends ConcreteUsers with keyspace.Connector
}
object UserDB extends ResourceAuthDB(conn) {
def createTable() {
Await.ready(users.create.ifNotExists().future(), 3.seconds)
}
}
However, when I try to create another table following the exact same way, play throws the exception when compile:
overriding method session in trait RootConnector of type => com.datastax.driver.core.Session;
How could I build create another table? Also can someone explain what causes the exception? Thanks.
EDIT
I moved the connection part together in one class:
class UserDB(val keyspace: KeySpaceDef) extends Database(keyspace) {
object users extends ConcreteUsers with keyspace.Connector
object auth extends ConcreteAuthInfo with keyspace.Connector
}
This time the error message is:
overriding object session in class AuthInfo; lazy value session in trait Connector of
type com.datastax.driver.core.Session cannot override final member
Hope the message helps identify the problem.

Answer 1

The only problem I see here is not to do with connectors, it's here:
def getById(page: String): Future[Option[User]] = {
select.where(_.id eqs id).one()
}
This should be:
def getById(page: String): Future[Option[User]] = {
select.where(_.id eqs page).one()
}
Try this, I was able to compile. Is RootConnector the default one or do you define another yourself?

Answer 2

It took me 6 hours to figure out the problem. It is because there is a column named "session" in the other table. It turns out that you need to be careful when selecting column names. "session" obviously gives the above exception. Cassandra also has a long list of reserved keywords. If you accidentally use one of them as your column name, phantom will not throw any exceptions (maybe it should?). I don't know if any other keywords are reserved in phantom. A list of them will be really helpful.