模式匹配Elixir记录Aganist结构

Question

有没有一种方法来模式匹配记录结构？例如下面给出了一条记录和一个结构。

struct = %User{name: "", twitter:""} 
record = {User, "mossplix ", "@mossplix"} 

Answer 1

你要么需要匹配字段中手动

defmodule Test do 
    def foo(%User{name: name, twitter: twitter}, {User, name, twitter}) do 
    IO.puts "match :)" 
    end 

    def foo(_struct, _record) do 
    IO.puts "no match :(" 
    end 
end 

，或者你需要将它转化成一个结构，然后再匹配两个

defmodule Test do 
    def foo(struct, record) do 
    do_foo struct, user_record_to_struct(record) 
    end 

    defp user_record_to_struct({User, name, twitter}) do 
    %User{name: name, twitter: twitter} 
    end 

    defp do_foo(struct, struct) do 
    IO.puts "match :)" 
    end 

    defp do_foo(_struct1, _struct2) do 
    IO.puts "no match :(" 
    end 
end