# File lib/symetrie_com/acts_as_better_nested_set.rb, line 593
        def children_by_id(*args)
          scope = args.last.is_a?(Hash) ? args.pop : {}
          ids = args.flatten.compact.uniq
          self.class.find_in_nested_set(:all, { 
            :conditions => ["#{scope_condition} AND (#{prefixed_left_col_name} BETWEEN #{self[left_col_name]} AND #{self[right_col_name]}) AND #{self.class.table_name}.#{self.class.primary_key} IN (?)", ids] 
          }, scope)
        end