Stemming library/plugin for Ruby on Rails

Looking for开发者_JS百科 a stemming library in Ruby which will allow me to create such mappings as:

maps_to["dogs"] = "dog"
maps_to["puppies"] = "dog"
maps_to["doggies"] = "dog"
etc 

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Try this : https://rubygems.org/gems/stemmer4r/

Stemming may not work the way most people think stemming works though.