iulianu

import scala.slick.lifted.CanBeQueryCondition
// optionally filter on a column with a supplied predicate
case class MaybeFilter[X, Y](val query: scala.slick.lifted.Query[X, Y]) {
  def filter[T,R:CanBeQueryCondition](data: Option[T])(f: T => X => R) = {
    data.map(v => MaybeFilter(query.filter(f(v)))).getOrElse(this)
  }
}

// example use case
import java.sql.Date

iulianu

sealed trait ContextDescription {
  def value: String
}
final case class EmailContext(value: String)  extends ContextDescription
final case class MobileContext(value: String) extends ContextDescription
// ...
Seq(EmailContext(email), MobileContext(mobile)).
  filter(_.value.nonEmpty).
  map( context =>
    LocalPersonContext(