Specifies a new pluralization rule and its replacement. The rule can either be a string or a regular expression. The replacement should always be a string that may include references to the matched data from the rule.
# File activesupport/lib/active_support/inflector/inflections.rb, line 105 def plural(rule, replacement) @uncountables.delete(rule) if rule.is_a?(String) @uncountables.delete(replacement) @plurals.prepend([rule, replacement]) end