带嵌入变量的Ruby字符串

Question

如何在yaml中存储带有嵌入变量的ruby字符串,但只有当我从yaml获取字符串时才插入变量值？

Answer 1

str = "Hi %{name}, %{msg}. Bye %{name}." #yaml it, de-yaml it back to string
h = {:name=> "John", :msg=> "this message is for you"}
puts str % h
#=>Hi John, This message is for you. Bye John.