I would like to simplify this complicated logic for creating unique Track 
object.

def self.create_unique(p)
  f = Track.find :first, :conditions => ['user_id = ? AND target_id = ? AND 
target_type = ?', p[:user_id], p[:target_id], p[:target_type]]
  x = ((p[:target_type] == 'User') and (p[:user_id] == p[:target_id]))
  Track.create(p) if (!f and !x)
end

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