In Ruby on Rails, why do some gems require config/initializers/foo.rb and some gems don't?

Question

For example, I think the gems such as haml doesn't need a file in config/initializers/ , while devise needs a config/initializers/devise.rb .

Why do some gems not need an initializer file and some do? Can they all be made to be without one or all require one? What's the rule?

Answer 1

有些gem需要比其他gem更多的配置，通常是在功能与帐户相关或需要手动配置以与您的特定Rails应用程序配合使用时（例如hoptoad_notifier和devise），其他gems在rails应用程序中提供或添加了更多常规功能，这些方法通常无需任何配置即可工作，但确实具有一定的灵活性，并且可以使用初始化程序（例如haml和will_paginate）进行自定义。