Ambiguous implicit values in GetResult when mixing in plain and standard converters

[mrwillis]

Hi,

I'm trying to combine this library with slick-codegen but I am having some issues when mixing in both plain and standard converter traits. Here is my custom profile:

trait CustomPostgresProfile extends ExPostgresProfile with PgDate2Support {
  def pgjson =
    "jsonb" // jsonb support is in postgres 9.4.0 onward; for 9.3.x use "json"

  override val api = MyAPI

  object MyAPI
      extends API
      with DateTimeImplicits
      with Date2DateTimePlainImplicits
}

object CustomPostgresProfile extends CustomPostgresProfile

The issue is when slick-codegen is run, it produces this code:

implicit def GetResultAuthTokenRow(implicit e0: GR[java.util.UUID], e1: GR[Int], e2: GR[OffsetDateTime]): GR[AuthTokenRow] = GR{
    prs => import prs._
    AuthTokenRow.tupled((<<[java.util.UUID], <<[Int], <<[OffsetDateTime]))
  }

which complains that there are two implicit converters of type slick.jdbc.GetResult[java.time.OffsetDateTime]

models/DbModels.scala:30:57: ambiguous implicit values:
[error]  both value getOffsetDateTime in trait Date2DateTimePlainImplicits of type => slick.jdbc.GetResult[java.time.OffsetDateTime]
[error]  and value e2 of type slick.jdbc.GetResult[java.time.OffsetDateTime]
[error]  match expected type slick.jdbc.GetResult[java.time.OffsetDateTime]
[error]     AuthTokenRow.tupled((<<[java.util.UUID], <<[Int], <<[OffsetDateTime]))

Do you know of any way to customize the generator to fix this?

Thanks

[tminglei]

@mrwillis prs => import prs._ import implicit converters duplicatedly? BTW, you should change object MyAPI to trait MyAPI. object MyAPI also brought us many issues.

[mrwillis]

Hi @tminglei, thanks for the response. Yes it is probably that line. Do you know of how to customize it with slick-codegen? Something in here? https://github.com/tminglei/slick-pg/blob/master/examples/codegen-customization/codegen/src/main/scala/demo/CustomizedCodeGenerator.scala

[tminglei]

Yes, you should customize this class.