在 Ruby on Rails 中，要扩展 String 类，代码应该放在哪里？

Question

提问by nonopolarity

If on Ruby on Rails, I need to add a method called

如果在 Ruby on Rails 上，我需要添加一个名为

class String
  def capitalize_first
    # ...
  end
end

and wonder where should the file go to? (which directory and filename, and is any initialize code needed?) This is for a Rails 3.0.6 project.

想知道文件应该去哪里？（哪个目录和文件名，是否需要任何初始化代码？）这是一个 Rails 3.0.6 项目。

Answer 1

I always add a core_extdirectory in my libdir.

我总是core_ext在我的目录中添加一个目录lib。

Create an initializerfor loading the custom extensions (for example: config/initializers/core_exts.rb). And add the following line in it:

创建用于加载自定义扩展的初始化程序（例如：）config/initializers/core_exts.rb。并在其中添加以下行：

Dir[File.join(Rails.root, "lib", "core_ext", "*.rb")].each {|l| require l }

and have your extension like:

并让您的扩展名如下：

lib/core_ext/string.rb

class String
  def capitalize_first
    # ...
  end
end

Answer 2

You could do it in config/initializers/string.rb

你可以在 config/initializers/string.rb

class String
  def capitalize_first
    # ...
  end
end

should be all you need (besides an app restart).

应该是您所需要的（除了应用程序重新启动）。

Answer 3

The guidelines in Rails 3.1 is the way to go:

Rails 3.1 中的指导方针是要走的路：

If you follow the default convention you won't need to mess with an initializer config.

如果您遵循默认约定，则无需弄乱初始化程序配置。