Rails 3 模板：inject_into_file 的奇怪行为

Question

我正在为 Rails 3 编写一个模板（您可以在此处找到它），但我在使用以下几行时遇到了问题：

# 8. config/database.yml modifications
if yes?("Do you want to set the database host to '/var/run/postgresql'?")
  inject_into_file "config/database.yml", " host: /var/run/postgresql\n", :after => "development:\n"


  # FIXME these two won't work :(((( why????
  # inject_into_file "config/database.yml", " host: /var/run/postgresql\n", :after => "production:\n"
  # inject_into_file "config/database.yml", " host: /var/run/postgresql\n", :after => "test:\n"


  # Not finding other solutions, I rewrite the two blocks above with two seds
  run %q(sed -i '/test:/a\ \ host: /var/run/postgresql' config/database.yml)
  run %q(sed -i '/production:/a\ \ host: /var/run/postgresql' config/database.yml)
end

也就是说，第一个 insert_to_file 有效，在 config/database.yml 中我有

development:
  host: /var/run/postgresql

但另外两个inject_to_file已成功应用，但不要修改config/database.yml！所以我有

test:
  adapter: postgresql

和

production:
  adapter: postgresql

Answer 1

您必须指定:force => true多次注入相同文本的选项。看：

http://rdoc.info/github/wycats/thor/master/Thor/Actions#insert_into_file-instance_method

这个版本对我有用：

https://gist.github.com/2573325

不过，不要问我为什么这个选项有意义。