Elixir：具有多个地图匹配选项的模式匹配

Question

在 Elixir 中而不是写这样的东西：

case getUser(id) do
  %User{status: "pending"} -> something()
  %User{status: "available"} -> something()
  _ -> something_else()
end

我简化为：

case getUser(id) do
  %User{status: "pending" | "available"} -> something()
  _ -> something_else()
end

但是出现错误：

cannot find or invoke local |/2 inside match. Only macros can be invoked in a match and they must be defined before their invocation. Called as: "pending" | "available"

有更好的方法吗？我不想把同一个函数写两次。

Answer 1

case getUser(id) do
  %User{status: status} when status in ["pending", "available"] -> something()
  _ -> something_else()
end

when .. in 是一个 Guard and is mentioned briefly on the case, cond, and if 页面。

Elixir：具有多个地图匹配选项的模式匹配

Elixir: Pattern match with multiple map match options

elixir

phoenix-framework