underscore(camel_cased_word) public

Makes an underscored, lowercase form from the expression in the string.

Changes ’::’ to ’/’ to convert namespaces to paths.


  "ActiveRecord".underscore         # => "active_record"
  "ActiveRecord::Errors".underscore # => active_record/errors

As a rule of thumb you can think of underscore as the inverse of camelize, though there are cases where that does not hold:

  "SSLError".underscore.camelize # => "SslError"
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