gamov

# our multi_group http://rails.lighthouseapp.com/projects/8994/tickets/120-patch-activerecord-calculations-only-accept-one-grouping-field#
# isn't updated for 2.2 yet. In the meantime, this poor man's version gives you the same results with some delimitter tom foolery.
# 
# note: be careful to ensure that your group_by do not use the delimitter 
# usage:
#   self.multi_count(:id, :distinct => true, :group => [:symptom_id, :treatment_id])        
#   [[["138", "1018"], 187], [["138", "427"], 373], [["6", "1018"], 197], [["6", "427"], 393]]
class ActiveRecord::Base  
  def self.multi_count(field, opts = {})
    fq_field_name = "#{table_name}.#{field}"