MappedEnum - No implicit view available

Question

Can someone help me to understand what is wrong with the code below? The problem is inside the "join" method - I am not able to set "state" field. Error message is -

No implicit view available from code.model.Membership.MembershipState.Val => _14.MembershipState.Value.
[error]         create.member(user).group(group).state(MembershipState.Accepted).save
[error]                                                       ^
[error] one error found
[error] (compile:compile) Compilation failed

What does _14 mean? I tried similar thing with MappedGender and it works as expected, so why MappedEnum fails?

scala 2.10 lift 2.5

Thanks

package code
package model

import net.liftweb.mapper._
import net.liftweb.util._
import net.liftweb.common._


class Membership extends LongKeyedMapper[Membership] with IdPK {
  def getSingleton = Membership


  object MembershipState extends Enumeration {
   val Requested = new Val(1, "Requested")
   val Accepted = new Val(2, "Accepted")
   val Denied = new Val(3, "Denied")
  }

  object state extends MappedEnum(this, MembershipState)
  {
    override def defaultValue = MembershipState.Requested
  }

  object member extends MappedLongForeignKey(this, User) {
    override def dbIndexed_? = true
  }


  object group extends MappedLongForeignKey(this, Group) {    
    override def dbIndexed_? = true
  }

}

object Membership extends Membership with LongKeyedMetaMapper[Membership] {
    def join (user : User, group : Group) = {       
        create.member(user).group(group).state(MembershipState.Accepted).save
    } 
}

Answer 1

Try moving your MembershipState enum outside of the MembershipClass. I was getting the same error as you until I tried this. Not sure why, but the code compiled after I did that.