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  friendly_id :foo, use: :slugged # you must do MyClass.friendly.find('bar')

I'am add this code ->
  friendly_id :foo, use: [:slugged, :finders] # you can now do MyClass.find('bar')


don't use MyClass.friendly.find('bar')             !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!