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Karma Issues:
has_karma conflicts with sqlite3 or Postgresql.

Without this fix, everyone had a karma of 0 (on sqlite3) or worse, the whole thing buckles down on postgresql (postgres is strongly typed an will not sum boolean fields). The above fix works with both.

Fix:

module InstanceMethods def karma(options = {})

1. count the total number of votes on all of the voteable objects that are related to this object
   #The following line is not SQLite3 compatible, because boolean are stored as ‘f’ or ‘t’, not ‘1’, or ‘0’
   #self.karma_voteable.sum(:vote, options_for_karma(options))
   self.karma_voteable.find(:all, options_for_karma(options).merge(:conditions => [‘vote = ?’, true])).length
   end

Merging the options and conditions might not be the best for scalability, but it works.

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How can you enforce single vote per user per votable if you are using the plugin as a gem? Shouldnt the validate_uniqueness be a config option?