ruby-on-rails - Is it acceptable practice to add methods to the Rails::Application subclass?

Question

I was thinking about being able to add an "application name" method to my Rails::Application subclass, since the method that I had originally added to a helper for ApplicationController is no longer visible to my ActionMailer.

ActionView::Template::Error: undefined local variable or method `app_name' for #<#<Class:0x44aba18>:0x449b8f0>

I haven't seen any reference to doing this in the standard rails tutorials, and a few Google queries don't indicate best or even acceptable practice.

I'd rather not have to hard code a lot of global application settings that may be of value in the mailer templates.

Answer 1

只要您在应用程序配置中“从外部”执行此操作，那么依赖项就是轻量级的，您可以使用新的 Rails 版本来维护它。如果由于某种原因你很紧张，你可以把它放在 a 中lib，但由于显而易见的原因，这可能会让人感觉更尴尬。

如果应用程序非常广泛地使用新方法，我属于将扩展原始类（如 String）的阵营。有些人不会；我听到的最常见的论点是“内存问题”——鉴于该应用程序的广泛使用，我永远无法理解。