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| trait EntityBase { | |
| def id: String | |
| } | |
| trait Repository { | |
| type Entity <: EntityBase | |
| def get(id: String): Option[Entity] | |
| } | |
| trait SlickRepository extends Repository { | |
| val profile: scala.slick.driver.JdbcProfile | |
| def database: profile.backend.Database | |
| import profile.simple._ | |
| abstract class BaseTable(tag: Tag, tableName: String) extends Table[Entity](tag, tableName) { | |
| def id: Column[String] | |
| } | |
| val table: TableQuery[BaseTable] // needs to be covariant | |
| override def get(id: String): Option[Entity] = database.withSession { implicit session => | |
| table.filter(_.id === id).list.headOption | |
| } | |
| } | |
| case class User(id: String, name: String, email: String) extends EntityBase | |
| trait UserRepository extends SlickRepository { | |
| type Entity = User | |
| import profile.simple._ | |
| class UserTable(tag: Tag) extends BaseTable(tag, "user") { | |
| def id = column[String]("userid", O.PrimaryKey, O.AutoInc) | |
| def name = column[String]("name") | |
| def email = column[String]("email") | |
| def * = (id, name, email) <> (User.tupled, User.unapply) | |
| } | |
| override val table = TableQuery[UserTable] // doesn't compile -- incompatible type | |
| } |
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Error:(46, 16) overriding value table in trait SlickRepository of type UserRepository.this.profile.simple.TableQuery[UserRepository.this.BaseTable];
value table has incompatible type
override val table = TableQuery[UserTable] // doesn't compile -- incompatible type
^