Slick Code Generator adding an extra sub generator

slickCodeGeneratorInsertDef.scala

/**
 * In custom Table implementation add a new `Def` or `TypeDef` implementation
 * and add it to the `definitions`.
 *
 * The custom `Def` can conditionally be applied to tables by overriding the `enabled` function.
 *
 * This `InsertDef` adds some helper functions to only insert a row based on a predicate.
 * See https://stackoverflow.com/a/31352126/3309859 for an example.
 * Since defining the `insert` query is quite cumbersome, I created the generator to generate it.
 */
def InsertDef = new TypeDef {
  // now only for shipments
  override def enabled: Boolean = Seq("shipments", "orders") contains model.name.table

  override def doc: String = "Helper Query functions for conditionally inserting a row."

  override def code: String = {
    val bindNames = columns.map(c => s"row.${c.name}.bind")
    val rowClassName = name
    val tableClassName = tableName(model.name.table)
    s"""def ${tableClassName}InsertQuery(row: $rowClassName) = (${bindNames.mkString(", ")}) <> ($rowClassName.apply _ tupled, $rowClassName.unapply)
       |def ${tableClassName}ExistsQuery(predicate: $tableClassName => Rep[Boolean]) = $tableClassName.filter(predicate).exists
       |def ${tableClassName}InsertIfNotExists(row: $rowClassName)(predicate: $tableClassName => Rep[Boolean]) = $tableClassName.forceInsertQuery {
       |  for {
       |    r <- Query(${tableClassName}InsertQuery(row)) if !${tableClassName}ExistsQuery(predicate)
       |  } yield r
       |}
       |""".stripMargin
  }

  override def rawName: String = entityName(model.name.table)
}

override def definitions = super.definitions :+ InsertDef