In Ruby on Rails, to extend the String class, where should the code be put in?

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I always add a core_ext directory in my lib dir.

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

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

and have your extension like:

lib/core_ext/string.rb

class String
  def capitalize_first
    # ...
  end
end

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