I'm trying to figure out how to add a query with a mapped projection in Slick, but no matter what I try I keep coming up against the following error:
[error] (run-main) scala.slick.SlickException:
Select(TableNode, "USER_NAME") found. This is typically
caused by an attempt to use a "raw" table object directly
in a query without introducing it through a generator.
scala.slick.SlickException: Select(TableNode, "USER_NAME")
found. This is typically caused by an attempt to use a "raw" table
object directly in a query without introducing it through a generator.
at scala.slick.ast.Select.<init>(Node.scala:340)
at scala.slick.ast.Select.copy(Node.scala:338)
at scala.slick.ast.Select.nodeRebuild(Node.scala:345)
at scala.slick.ast.Select.nodeRebuild(Node.scala:338)
at scala.slick.ast.UnaryNode$class.nodeRebuild(Node.scala:141)
at scala.slick.ast.Select.nodeRebuild(Node.scala:338)
at scala.slick.ast.SimpleNode$$anonfun$nodeMapChildren$1.apply(Node.scala:62)
at scala.slick.ast.SimpleNode$$anonfun$nodeMapChildren$1.apply(Node.scala:62)
at scala.Option.map(Option.scala:145)
at scala.slick.ast.SimpleNode$class.nodeMapChildren(Node.scala:62)
at scala.slick.ast.Select.nodeMapChildren(Node.scala:338)
at scala.slick.compiler.Inline.scala$slick$compiler$Inline$$tr$1(Inline.scala:67)
at scala.slick.compiler.Inline$$anonfun$scala$slick$compiler$Inline$$tr$1$3.apply(Inline.scala:67)
at scala.slick.compiler.Inline$$anonfun$scala$slick$compiler$Inline$$tr$1$3.apply(Inline.scala:67)
at scala.slick.ast.Node$$anonfun$nodeMapNodes$1.apply(Node.scala:38)
at scala.slick.ast.Node$$anonfun$nodeMapNodes$1.apply(Node.scala:37)
at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:59)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
at scala.slick.ast.Node$class.nodeMapNodes(Node.scala:37)
at scala.slick.ast.ProductNode$$anon$3.nodeMapNodes(Node.scala:82)
at scala.slick.ast.SimpleNode$class.nodeMapChildren(Node.scala:62)
at scala.slick.ast.ProductNode$$anon$3.nodeMapChildren(Node.scala:82)
at scala.slick.compiler.Inline.scala$slick$compiler$Inline$$tr$1(Inline.scala:67)
at scala.slick.compiler.Inline$$anonfun$scala$slick$compiler$Inline$$tr$1$3.apply(Inline.scala:67)
at scala.slick.compiler.Inline$$anonfun$scala$slick$compiler$Inline$$tr$1$3.apply(Inline.scala:67)
at scala.slick.ast.Node$$anonfun$nodeMapNodes$1.apply(Node.scala:38)
at scala.slick.ast.Node$$anonfun$nodeMapNodes$1.apply(Node.scala:37)
at scala.collection.immutable.List.foreach(List.scala:309)
at scala.slick.ast.Node$class.nodeMapNodes(Node.scala:37)
at scala.slick.ast.Pure.nodeMapNodes(Node.scala:151)
at scala.slick.ast.SimpleNode$class.nodeMapChildren(Node.scala:62)
at scala.slick.ast.Pure.nodeMapChildren(Node.scala:151)
at scala.slick.compiler.Inline.scala$slick$compiler$Inline$$tr$1(Inline.scala:67)
at scala.slick.compiler.Inline$$anonfun$scala$slick$compiler$Inline$$tr$1$3.apply(Inline.scala:67)
at scala.slick.compiler.Inline$$anonfun$scala$slick$compiler$Inline$$tr$1$3.apply(Inline.scala:67)
at scala.slick.ast.Node$$anonfun$nodeMapNodes$1.apply(Node.scala:38)
at scala.slick.ast.Node$$anonfun$nodeMapNodes$1.apply(Node.scala:37)
at scala.collection.immutable.List.foreach(List.scala:309)
I'm new to Scala and Slick and am having difficulty figuring out what the message means. I think it has to do with this (taken from the slick docs):
Note that Slick clones your table objects under the covers, so you should not add any extra state to them (extra methods are fine though). Also make sure that an actual object for a table is not defined in a static location (i.e. at the top level or nested only inside other objects) because this can cause problems in certain situations due to an overeager optimization performed by scalac. Using a val for your table (with an anonymous structural type or a separate class definition) is fine everywhere. Lifted Embedding
I've modified the slick-examples MultiDBCakeExample to look like the code below and have tried several permutations but with no luck. The code below is taken from my forked version of the slick-examples project. Here is a link to just my changes.
package com.typesafe.slick.examples.lifted
import scala.slick.driver.ExtendedProfile
import scala.slick.session.Session
import scala.slick.driver.H2Driver
import scala.slick.driver.SQLiteDriver
trait Profile {
val profile: ExtendedProfile
}
case class Picture(url: String, id: Option[Int] = None)
trait PictureComponent { this: Profile => //requires a Profile to be mixed in...
import profile.simple._ //...to be able import profile.simple._
object Pictures extends Table[(String, Option[Int])]("PICTURES") {
// ^ Table comes from the *current* profile
def id = column[Option[Int]]("PIC_ID", O.PrimaryKey, O.AutoInc)
def url = column[String]("PIC_URL", O.NotNull)
def * = url ~ id
val autoInc = url returning id into { case (url, id) => Picture(url, id) }
def insert(picture: Picture)(implicit session: Session): Picture = {
autoInc.insert(picture.url)
}
}
}
case class User(name: String, picture: Picture, id: Option[Int] = None)
case class UserAndPicId(name: String, picId: Int)
trait UserComponent { this: Profile with PictureComponent => //requires Profile and Picture (see def insert)
import profile.simple._
object Users extends Table[(String, Int, Option[Int])]("USERS") {
def id = column[Option[Int]]("USER_ID", O.PrimaryKey, O.AutoInc)
def name = column[String]("USER_NAME", O.NotNull)
def pictureId = column[Int]("PIC_ID", O.NotNull)
def * = name ~ pictureId ~ id
def justNameAndPicId = name ~ pictureId <> (UserAndPicId, UserAndPicId.unapply _)
private def autoInc(implicit session: Session) = name ~ pictureId returning id into {
case (_, id) => id
}
def insert(user: User)(implicit session: Session): User = {
val picture = if (user.picture.id.isEmpty) { //if no picture id...
Pictures.insert(user.picture) //...insert
} else user.picture //else return current picture
val id = autoInc.insert(user.name, picture.id.get)
user.copy(picture = picture, id = id)
}
def userAndPicById = for {
id <- Parameters[Int]
user <- this if user.id === id
} yield justNameAndPicId
}
}
/**
* The Data Access Layer contains all components and a profile
*/
class DAL(override val profile: ExtendedProfile) extends UserComponent with PictureComponent with Profile {
import profile.simple._
def create(implicit session: Session): Unit = {
(Users.ddl ++ Pictures.ddl).create //helper method to create all tables
}
}
/**
* Run SLICK code with multiple DBMSs using the Cake pattern.
* Typically this technique can be used to have different DBMS
* in production and test (other scenarios are possible as well)
*/
object MultiDBCakeExample {
// We only need the DB/session imports outside the DAL
import scala.slick.session.{ Database, Session }
def run(name: String, dal: DAL, db: Database) {
import dal._
import dal.profile.simple._
println("Running test against " + name)
db withSession { implicit session: Session =>
dal.create
//creating our default picture
val defaultPic = Pictures.insert(Picture("http://pics/default"))
println(" Inserted picture: " + defaultPic)
//inserting users
val (user1, user2, user3) = (User("name1", defaultPic), User("name2", Picture("http://pics/2")), User("name3", defaultPic))
println(" Inserted user: " + Users.insert(user1))
println(" Inserted user: " + Users.insert(user2))
println(" Inserted user: " + Users.insert(user3))
println(" All pictures: " + Query(Pictures).list)
println(" All users : " + Query(Users).list)
println(" Attempting to fetch UserAndPicId by id")
Users.userAndPicById(1).firstOption
}
}
def main(args: Array[String]) {
run("H2", new DAL(H2Driver),
Database.forURL("jdbc:h2:mem:test1", driver = "org.h2.Driver"))
run("SQLite", new DAL(SQLiteDriver),
Database.forURL("jdbc:sqlite::memory:", driver = "org.sqlite.JDBC"))
}
}