_update_record

# File activerecord/lib/active_record/relation.rb, line 72
    def _update_record(values, id, id_was) # :nodoc:
      substitutes, binds = substitute_values values

      scope = @klass.unscoped

      if @klass.finder_needs_type_condition?
        scope.unscope!(where: @klass.inheritance_column)
      end

      relation = scope.where(@klass.primary_key => (id_was || id))
      bvs = binds + relation.bind_values
      um = relation
        .arel
        .compile_update(substitutes, @klass.primary_key)

      @klass.connection.update(
        um,
        'SQL',
        bvs,
      )
    end