Slick BlogPostModel with optionally loaded author

slick-optional-loading

object BlogPostModel {

  case class BlogPost (
                        id: Option[Long] = None,
                        title: String,
                        author_id: Long,
                        postedDate: LocalDate,
                        summary: String,
                        content: String,
                        published: Boolean) {
    var author: Option[User] = None
  }

  class BlogPosts(tag: Tag) extends Table[BlogPost](tag, "blog_post") {
    def id = column[Long]("id", O.PrimaryKey, O.AutoInc)
    def title = column[String]("title")
    def author_id = column[Long]("author_id")
    def postedDate = column[LocalDate]("date_posted")
    def summary = column[String]("summary")
    def content = column[String]("content")
    def published = column[Boolean]("published")

    def * = (id.?, title, author_id, postedDate, summary, content, published) <> (BlogPost.tupled, BlogPost.unapply)
  }

  val blogPosts = TableQuery[BlogPosts]
}