Converting Case to Underscore in Ruby

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There is a ready-to-use function that converts Strings to Camel case for strings separated by underscores?

I wish something like that:

"CamelCaseString".to_underscore

return "camel_case_string".

ruby formatting

1 answer

5


Rails' Activesupport adds underscore to the String class using this code: 

class String
  def underscore
    self.gsub(/::/, '/').
    gsub(/([A-Z]+)([A-Z][a-z])/,'\1_\2').
    gsub(/([a-z\d])([A-Z])/,'\1_\2').
    tr("-", "_").
    downcase
  end
end

Ready: 

"CamelCase".underscore
=> "camel_case"

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