Flowdock
method

underscore

Importance_1
Ruby on Rails latest stable (v4.0.2) - 0 notes - Class: ActiveSupport::Inflector
underscore(camel_cased_word) public

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

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

'ActiveModel'.underscore         # => "active_model"
'ActiveModel::Errors'.underscore # => "active_model/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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