i solved the first with this:

  acts_as_ferret :fields => [:com

  def com
    self.comment == '' ? 'null' : 'comment'
  end

  def self.full_text_search(query)
     return nil if query.nil? or (query == '')
     query = "com:null"
     Model.find_by_contents(query, {:limit => :all})
  end



because i don't need to have the comment, so a simple 'comment' is ok...

about the join how can i do ? :(

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