Converting camel case to underscore case in ruby
Rails' ActiveSupport adds underscore to the String using the following:
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 endendThen you can do fun stuff:
"CamelCase".underscore=> "camel_case"
You can use
"CamelCasedName".tableize.singularizeOr just
"CamelCasedName".underscoreBoth options ways will yield "camel_cased_name". You can check more details it here.
One-liner Ruby implementation:
class String # ruby mutation methods have the expectation to return self if a mutation occurred, nil otherwise. (see http://www.ruby-doc.org/core-1.9.3/String.html#method-i-gsub-21) def to_underscore! gsub!(/(.)([A-Z])/,'\1_\2') downcase! end def to_underscore dup.tap { |s| s.to_underscore! } endendSo "SomeCamelCase".to_underscore # =>"some_camel_case"