Using Auto Incrementing fields with PostgreSQL and Slick

Question

How does one insert records into PostgreSQL using AutoInc keys with Slick mapped tables? If I use and Option for the id in my case class and set it to None, then PostgreSQL

Answer 1

The solution I've found is to use SqlType("Serial") in the column definition. I haven't tested it extensively yet, but it seems to work so far.

So instead of

def id: Rep[PK[SomeTable]] = column[PK[SomeTable]]("id", O.PrimaryKey, O.AutoInc)

You should do:

def id: Rep[PK[SomeTable]] = column[PK[SomeTable]]("id", SqlType("SERIAL"), O.PrimaryKey, O.AutoInc)

Where PK is defined like the example in the "Essential Slick" book:

final case class PK[A](value: Long = 0L) extends AnyVal with MappedTo[Long]