scala - SQueryL波浪号运算符有什么作用？

Question

我正在阅读 SQueryL documentation关于更新，我看到了:

update(songs)(s =>
  where(s.title === "Watermelon Man")
  set(s.title := "The Watermelon Man",
      s.year  := s.year.~ + 1)
)

我很难从 SQueryL 源代码中找到 ~ 方法，链接的文档显然也没有告诉我它的作用。有人愿意解释一下吗？

Answer 1

我记得不久前在 Schema Definition Page 上读过波浪号运算符.它是关于消除原始类型和自定义类型之间的歧义，尽管(因为我刚刚开始学习 Scala)它对我来说仍然有点模糊;)。引用一个小片段

...

important : in PrimitiveTypes mode there can be ambiguities between numeric operators

When using org.squeryl.PrimitiveTypeMode, the compiler will treat an expression like the one in the next example as a Boolean. The .~ function is needed to tell the compiler that the left side is a node of TypedExpressionNode[Int] which will cause the whole expression to be a LogicalBoolean which is what the where clause takes :

...

希望对您有所帮助。