add_conditions!

# File activerecord/lib/active_record/base.rb, line 1729
        def add_conditions!(sql, conditions, scope = :auto)
          scope = scope(:find) if :auto == scope
          conditions = [conditions]
          conditions << scope[:conditions] if scope
          conditions << type_condition if finder_needs_type_condition?
          merged_conditions = merge_conditions(*conditions)
          sql << "WHERE #{merged_conditions} " unless merged_conditions.blank?
        end