Scala & Play! & Slick & PostgreSQL auto increment - postgresql

Question

I have the following code in Scala:
case class Product(id: Option[Long] = None, name: String, price: BigDecimal, description: String)
object Products extends Table[Product]("product") {
def id = column[Long]("id", O.AutoInc, O.PrimaryKey)
def name = column[String]("name", O.NotNull)
def price = column[BigDecimal]("price", O.NotNull)
def description = column[String]("description", O.NotNull)
def * = id.? ~ name ~ price ~ description <>(Product.apply _, Product.unapply _)
def autoInc = * returning id
def add(product: Product)(implicit s:Session): Long = {
Products.autoInc.insert(product)
}
def all(implicit s:Session): List[Product] = {
Query(Products).list
}
}
Listing all products works great, however, I can't make adding method working.
After calling:
val myProduct = models.Product(id = None, name = "test2", price = BigDecimal(2.99), description = "test3")
models.Products.add(myProduct)
I constanty get an error message from PostgreSQL saying that id cannot be null. I totally agree with that, but why the id column is not being set by autoInc? Doesn't it work that way?
I use Play! 2.1.2, Scala 2.10.0, PostgreSQL 9.3 and play-slick 0.3.3.
Thanks in advance.

Answer 1

Here is a suggestion, rewrite your autoInc and add methods like this:
def autoInc = name ~ price ~ description returning id
def add(product: Product)(implicit s:Session): Long = {
Products.autoInc.insert(p.name, p.price, p.description)
}
Some databases own't allow you to insert null in the auto increment column. Maybe it's the Postgres case.