delete_records

# File activerecord/lib/active_record/associations/has_and_belongs_to_many_association.rb, line 45
        def delete_records(records, method)
          if sql = options[:delete_sql]
            records = load_target if records == :all
            records.each { |record| owner.connection.delete(interpolate(sql, record)) }
          else
            relation = join_table
            stmt = relation.where(relation[reflection.foreign_key].eq(owner.id).
              and(relation[reflection.association_foreign_key].in(records.map { |x| x.id }.compact))
            ).compile_delete
            owner.connection.delete stmt
          end
        end