slick filter from any other class - scala

Question

I have a case class, mappings and the object defined like this
import slick.driver.PostgresDriver.api._
import scala.concurrent.Await
import scala.concurrent.duration.Duration
case class Coffee(name : String, supID: Int, price: Double, sales: Int, total: Int) {
def save(): Coffee = { Coffees.save(this) }
def delete() { Coffees.delete(this) }
}
class Coffees(tag: Tag) extends Table[Coffee](tag, "coffee") {
def name = column[String]("cof_name", O.PrimaryKey)
def supID = column[Int]("sup_id")
def price = column[Double]("price")
def sales = column[Int]("sales", O.Default(0))
def total = column[Int]("total", O.Default(0))
def * = (name, supID, price, sales, total) <> (Coffee.tupled, Coffee.unapply)
}
object Coffees extends TableQuery(new Coffees(_)) {
lazy val db = DatabaseAccess.databases("db.test")
def save(coffee: Coffee): Coffee = {
val saveQuery = (this returning this).insertOrUpdate(coffee)
Await.result(db.run(saveQuery), Duration.Inf) match {
case Some(x) => x
case None => coffee
}
}
def delete(coffee: Coffee) = {
Await.result(db.run(this.filter(_.name === coffee.name).delete), Duration.Inf)
}
}
Now I want to write queries from other classes like this :
import com.typesafe.config.ConfigFactory
import org.scalatest.{FeatureSpec, GivenWhenThen, Matchers}
class CoffeeSpec extends FeatureSpec with GivenWhenThen with Matchers {
feature("Accessing coffees in the database") {
scenario("Adding a new coffee") {
val config = ConfigFactory.load()
DatabaseAccess.loadConfiguration(config)
lazy val db = DatabaseAccess.databases("db.test")
val coffee = Coffee("nescafe", 1, 20, 20, 40).save()
val temp = Coffees.filter(_.name === "nescafe")
temp.length should be (1)
coffee.delete()
}
}
}
This line
val temp = Coffees.filter(_.name === "nescafe")
Throws an error like this:
What is the best way to write the filter queries on the Coffees object?
Using slick 2.0 I have queries like:
Query(Coffees).filter(_.name is "coffee").firstOption.getOrElse(None)
I want to be able to do the similar queries using the new setup for all the data mappings.
Why am I getting these errors and how should I be able to make similar queries in slick 3?

Answer 1

Your queries are fine, but your CoffeeSpec file is missing an import:
import slick.driver.PostgresDriver.api._
Compilation should pass then.