如何在不需要复制所有键的情况下强制执行结构中的所有键?为了澄清,我想干这个:
defmodule Ticket do
@enforce_keys [:origin, :destination, :price]
defstruct [:origin, :destination, :price]
end
我可以使用其他变量:
defmodule Ticket do
struct_keys = [:origin, :destination, :price]
@enforce_keys struct_keys
defstruct struct_keys
end
它工作正常,但看起来很吵。有没有更好的方法?
最佳答案
您可以通过@enforce_keys
至defstruct
自从 @enforce_keys
只是一个普通的模块属性:
defmodule Ticket do
@enforce_keys [:origin, :destination, :price]
defstruct @enforce_keys
end
iex(1)> defmodule Ticket do
...(1)> @enforce_keys [:origin, :destination, :price]
...(1)> defstruct @enforce_keys
...(1)> end
iex(2)> %Ticket{}
** (ArgumentError) the following keys must also be given when building struct Ticket: [:origin, :destination, :price]
expanding struct: Ticket.__struct__/1
iex:2: (file)
关于struct - 强制执行结构中的所有键,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/41609368/