def delete
      i = 0
      loop do
        logger.info("deletion loop iteration #{i}")
        i += 1

        return unless anything_to_delete?

        criteria.each do |table, selection|
          delete_selection(table, selection)
        end
      end
    end
def delete
      i = 0
      loop do
        logger.info("deletion loop iteration 
        i += 1

        return unless anything_to_delete?

        criteria.each do |table, selection|
          delete_selection(table, selection)
        end
      end
    end
def delete i = 0 loop do logger . info ( "deletion loop iteration #{i}" ) i += 1 return unless anything_to_delete? criteria . each do | table , selection | delete_selection ( table , selection ) end end end
criteria is of form [['users', "name = 'andrew'"], ['comments', 'id NOT IN (1, 2, 3)']]
criteria is of form [[ users name = andrew ] [ comments id NOT IN ( 1 2 3 ) ]]