In Rails, how to add a new method to String class?

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You can define a new class in your application at lib/ext/string.rb and put this content in it:

class String
  def to_magic
    "magic"
  end
end

To load this class, you will need to require it in your config/application.rb file or in an initializer. If you had many of these extensions, an initializer is better! The way to load it is simple:

require 'ext/string'

The to_magic method will then be available on instances of the String class inside your application / console, i.e.:

>> "not magic".to_magic
=> "magic"

No plugins necessary.

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