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，但仅在从yaml获取字符串时插入变量值？在YAML文件

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. 

Answer 2

ERB嵌入铁轨那样：

# config/initializers/load_config.rb 
APP_CONFIG = YAML.load_file("#{Rails.root}/config/app_config.yml")[Rails.env] 


# config/app_config.yml 
development: 
    key1: <%= # ruby code ... %> 
test: 
    key1: <%= # ruby code ... %> 
production: 
    key1: <%= # ruby code ... %>