_update_record

# File activerecord/lib/active_record/persistence.rb, line 378
      def _update_record(values, constraints) # :nodoc:
        constraints = _substitute_values(constraints).map { |attr, bind| attr.eq(bind) }

        um = arel_table.where(
          constraints.reduce(&:and)
        ).compile_update(_substitute_values(values), primary_key)

        connection.update(um, "#{self} Update")
      end