光滑没有找到匹配的形状

如何解决光滑没有找到匹配的形状

  case class supplier(id:Int,name:String,street:String,city:String,state: String,zip:String)

  class suppliers(tag: Tag) extends Table[supplier](tag,"suppliers") {
    def id = column[Int]("ID",O.PrimaryKey)// This is the primary key column
    def name = column[String]("Name")
    def street = column[String]("Street")
    def city = column[String]("City")
    def state = column[String]("State")
    def zip = column[String]("Zip")

    override def * = (id,name,street,city,state,zip) <> ((supplier.apply _).tupled,supplier.unapply)
  }
  val suppliers = TableQuery[suppliers]

  case  class Coffee(name:String,supID:Int,price:Double,sales:Int,total:Int)

  class Coffees(tag: Tag) extends Table[Coffee](tag,"Coffees") {
    def name = column[String]("Name",O.PrimaryKey)
    def supID = column[Int]("Sup_ID")
    def price = column[Double]("Price")
    def sales = column[Int]("Sales")
    def total = column[Int]("Total")
    def * = (name,supID,price,sales,total) <> ((Coffee.apply _).tupled,Coffee.unapply)

    def supplier = foreignKey("Sup_FK",suppliers)(_.id)
  }
  val coffees = TableQuery[Coffees]

这些是表定义，我想进行联接查询

val manualJoin = for {
    c <- coffees if c.price < 9.0
    s <- suppliers if s.id===c.supID
  } yield (c.name,s.name)

但是它给出了下面的错误

No matching Shape found.
Slick does not kNow how to map the given types.
Possible causes: T in Table[T] does not match your * projection,you use an unsupported type in a Query (e.g. scala List),or you forgot to import a driver api into scope.
  required level: slick.lifted.FlatShapeLevel
     Source type: (slick.lifted.Rep[String],slick.lifted.Rep[String])
   Unpacked type: T
     Packed type: G

    s <- suppliers if s.id===c.supID

我不知道该如何解决。有人可以解释一下是什么问题吗？

这些是进口

import slick.jdbc.MysqLProfile.api._
import scala.concurrent.ExecutionContext.Implicits.global
import slick.ast.ScalaBaseType.stringType
import scala.concurrent.Await
import scala.concurrent.duration.Duration

解决方法

删除import slick.ast.ScalaBaseType.stringType行。我怀疑这会在范围内引入不明确的隐式。