django - 如何在不公开数据库中字段名称的情况下使用 OrderingFilter

Question

我有一个使用 OrderingFilter 的模型后端。现在只能按字段订购 id被允许。

我也想提供按其他字段排序的选项，但不必在我的数据库中公开字段名称。有没有办法做到这一点？

Answer 1

我创建了一个 AliasedOrderingFilter 应该很好地满足这个需求。它扩展了 ordering_fields 属性以允许字段和字符串的元组。例如，您可以将 View ordering_fields 设置为:

ordering_fields = (('alias1', 'field1'),('alias2', 'field2'), 'field3')

在带有 ordering=alias1,-alias2,field3 的请求中使用此类将导致:

qs.order_by('field1', '-field2', 'field3)

类(class):

class AliasedOrderingFilter(OrderingFilter):
    ''' this allows us to "alias" fields on our model to ensure consistency at the API level
        We do so by allowing the ordering_fields attribute to accept a list of tuples.
        You can mix and match, i.e.:
        ordering_fields = (('alias1', 'field1'), 'field2', ('alias2', 'field2')) '''

    def remove_invalid_fields(self, queryset, fields, view):      
        valid_fields = getattr(view, 'ordering_fields', self.ordering_fields)
        if valid_fields is None or valid_fields == '__all__':
            return super(AliasedOrderingFilter, self).remove_invalid_fields(queryset, fields, view)

        aliased_fields = {}
        for field in valid_fields:
            if isinstance(field, basestring):
                aliased_fields[field] = field
            else:
                aliased_fields[field[0]] = field[1]

        ordering = []
        for raw_field in fields:
            invert = raw_field[0] == '-'
            field = raw_field.lstrip('-')
            if field in aliased_fields:
                if invert:
                    ordering.append('-{}'.format(aliased_fields[field]))
                else:
                    ordering.append(aliased_fields[field])
        return ordering