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[英]value isEmpty is not a member of slick.lifted.Rep[Option[java.time.LocalDateTime]]
[英]value ~ is not a member of slick.lifted.Rep[Option[Int]]
我有一個Scala編譯錯誤我一直無法找到任何信息。 我正在使用光滑的3.0,並得到編譯錯誤
value ~ is not a member of slick.lifted.Rep[Option[Int]]
我相信這個問題與我使用Option代表我的ID字段的方式有關。
我試過添加id.?
到這個答案中建議的id字段,但我仍然以同樣的方式得到編譯錯誤。 光滑3.0有什么變化嗎?
我的代碼如下:
import slick.driver.H2Driver.api._
import scala.concurrent.ExecutionContext.Implicits.global
case class Recipe(id: Option[Int] = None, name: String, instructions: String, ingredients: String)
object AddFixtures {
class Recipes(tag: Tag) extends Table[Recipe](tag, "recipe") {
def id = column[Int]("id", O.PrimaryKey, O.AutoInc)
def name = column[String]("name")
def instructions = column[String]("instructions")
def ingredients = column[String]("ingredients")
def * = id ~ name ~ instructions ~ ingredients <> (Recipe, Recipe.unapply _)
}
val recipes = TableQuery[Recipes]
val setup = DBIO.seq(
recipes.schema.create,
recipes += Recipe(None, "Chicken with Avocado", "Mix it up", "Chicken, Avocado")
)
def apply() = {
val db = Database.forConfig("h2mem1")
try db.run(setup)
finally db.close
}
}
我認為問題是在光滑3.0.0中沒有像以前那樣使用某些符號
看看這里有進一步的問題
在你的情況下,有問題的行將是這樣的,取決於你將要做什么,但這應該工作:
def * =(id,name,instructions,ingredients)<>((Recipe.apply _)。tupled,Recipe.unapply _)
此外,您不需要implicits導入
你的選項[Int]參數也有問題:也許這應該更好:
import slick.driver.H2Driver.api._
object SlickStackOverflow extends App {
}
case class Recipe(id: Option[Int] = None, name: String, instructions: String, ingredients: String)
object AddFixtures {
class Recipes(tag: Tag) extends Table[Recipe](tag, "recipe") {
def id = column[Option[Int]]("id", O.PrimaryKey, O.AutoInc)
def name = column[String]("name")
def instructions = column[String]("instructions")
def ingredients = column[String]("ingredients")
def * = (id, name, instructions, ingredients) <> ((Recipe.apply _).tupled, Recipe.unapply _)
}
val recipes = TableQuery[Recipes]
val setup = DBIO.seq(
recipes.schema.create,
recipes += Recipe(None, "Chicken with Avocado", "Mix it up", "Chicken, Avocado")
)
def apply() = {
val db = Database.forConfig("h2mem1")
try db.run(setup)
finally db.close
}
}
或者添加。? 對於字段ID,沒有使用Option,就像我們在評論中談話一樣,我認為這種方法更好
package org.example
import slick.driver.H2Driver.api._
object SlickStackOverflow extends App {
}
case class Recipe(id: Option[Int], name: String, instructions: String, ingredients: String)
object AddFixtures {
class Recipes(tag: Tag) extends Table[Recipe](tag, "recipe") {
def id = column[Int]("id", O.PrimaryKey, O.AutoInc)
def name = column[String]("name")
def instructions = column[String]("instructions")
def ingredients = column[String]("ingredients")
def * = (id.?, name, instructions, ingredients) <> ((Recipe.apply _).tupled, Recipe.unapply _)
}
val recipes = TableQuery[Recipes]
val setup = DBIO.seq(
recipes.schema.create,
recipes += Recipe(None, "Chicken with Avocado", "Mix it up", "Chicken, Avocado")
)
def apply() = {
val db = Database.forConfig("h2mem1")
try db.run(setup)
finally db.close
}
}
field1 ~ field2
構造實際上是在引擎蓋下構造一個(field1, field2)
元組,所以@anquegi指出,只需改變你的*
投影就可以直接使用元組。
或者,如果你想使用~
來構造元組,你可以通過導入TupleMethods
來取回它(因為~
被移出 Slick 2.0 中的正常導入范圍 。):
import slick.util.TupleMethods._
另請參閱: Slick 2.0 - 更新兩列或更多列
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