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-rw-r--r--activesupport/lib/active_support/inflector/methods.rb1
1 files changed, 1 insertions, 0 deletions
diff --git a/activesupport/lib/active_support/inflector/methods.rb b/activesupport/lib/active_support/inflector/methods.rb
index b642d87d76..a270c4452f 100644
--- a/activesupport/lib/active_support/inflector/methods.rb
+++ b/activesupport/lib/active_support/inflector/methods.rb
@@ -89,6 +89,7 @@ module ActiveSupport
#
# 'SSLError'.underscore.camelize # => "SslError"
def underscore(camel_cased_word)
+ return camel_cased_word unless camel_cased_word =~ /[A-Z-]|::/
word = camel_cased_word.to_s.gsub('::', '/')
word.gsub!(/(?:([A-Za-z\d])|^)(#{inflections.acronym_regex})(?=\b|[^a-z])/) { "#{$1}#{$1 && '_'}#{$2.downcase}" }
word.gsub!(/([A-Z\d]+)([A-Z][a-z])/,'\1_\2')