Squeryl Scala Example

error

[error] /Users/abhishekk/flipkart/platform/star-command/src/main/scala/flipkart/platform/starcommand/model/Models.scala:34: inferred type arguments [flipkart.platform.starcommand.model.Host,flipkart.platform.starcommand.model.Tag,Nothing] do not conform to method manyToManyRelation's type parameter bounds [L <: org.squeryl.KeyedEntity[_],R <: org.squeryl.KeyedEntity[_],A <: org.squeryl.KeyedEntity[_]]
[error]   val hostTags = manyToManyRelation(hosts, tags).via[HostTag]((h, t, ht) => (ht.tagId == t.id, h.id == ht.hostId))
[error]                  ^
[error] one error found

what.scala

class Host(val id: Long,
           val name: String,
           val config: Option[String]) {
  def this() = this (0, "", Some(""))
}

class Tag(val id: Long,
          val name: String,
          val config: Option[String]) {
  def this() = this (0, "", Some(""))
}

class HostTag(val hostId: Int, val tagId: Int) extends KeyedEntity[CompositeKey2[Int, Int]] {
  def id = compositeKey(hostId, tagId)
}


object HostDB extends Schema {
  val hosts = table[Host]

  val tags = table[Tag]

  val hostTags = manyToManyRelation(hosts, tags).via[HostTag]((h, t, ht) => (ht.tagId == t.id, h.id == ht.hostId))

  on(hosts)(host => declare(
    host.id is(unique, indexed, primaryKey),
    host.name is(unique, indexed),
    host.config is (dbType("text"))
  ))

  on(tags)(tag => declare(
    tag.id is(unique, indexed, primaryKey),
    tag.name is(unique, indexed),
    tag.config is (dbType("text"))
  ))


}