inserting a list of objects not working in slick - scala

Question

I am using slick3.1.1
I want to insert a list of objects in DB (postgres)
I have written following code which works
for(user<-x.userList)
{
val users = userClass(user.name,user.id)
val userAction = DBAccess.userTable.insertOrUpdate(users)
val f = DBAccess.db.run(DBIO.seq(userAction))
Await.result(f, Duration.Inf)
}
However I am running multiple DB queries. So I was looking some way to call only a single db.run.
So I wrote something like below
val userQuery = TableQuery[dbuserTable]
for(user<-x.userList)
{
val users = userClass(user.name,user.id)
userQuery += users
}
val f = DBAccess.db.run(DBIO.seq(userQuery.result))
Await.result(f, Duration.Inf)
However this second piece does not write to DB. Can someone point out where I am going wrong?

Answer 1

I know this old but since I just fell on it I'll give an updated answer for this.
You can use ++= to insert a list.
val usersTable = TableQuery[dbuserTable]
val listToInsert = x.userList.map(userClass(_.name, _.id))
val action = usersTable ++= listToInsert
DBAccess.db.run(action)
This will only do one request that insert everything at once.

Answer 2

+= doesn't mutate your userQuery. Every iteration of your for loop creates an insert action and then promptly discards it.
Try accumulating the insert actions instead of discarding them (NB use of yield):
val usersTable = TableQuery[dbuserTable]
val inserts = for (user <- x.userList) yield {
val userRow = userClass(user.name, user.id)
usersTable += userRow
}
DBAccess.db.run(DBIO.seq(inserts: _*))