Formencode 条件验证

发布于 2024-11-04 13:29:14 字数 272 浏览 1 评论 0原文

如何根据另一个字段的存在有条件地验证一个字段。例如，仅当“国家”为“美国”时才需要“州”。

谢谢，史蒂夫

编辑：

所以我想这样做：

chained_validators = [validators.RequireIfPresent('state', present="country")]

但错误消息与“_the_form”而不是“state”相关。有没有办法将其链接到该字段？

原文

how do i validate a field conditionally based on the presence of another field. for example, only make "state" required only if "country" is "US".

thanks,
steve

EDIT:

so i figured to do this:

chained_validators = [validators.RequireIfPresent('state', present="country")]

but the error message is associated with "_the_form" instead of "state". is there a way to link it to the field instead?

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他是夢罘是命 2024-11-11 13:29:14

我公司做项目的时候也遇到了同样的问题。我们为此编写了自己的 Formencode 验证器。我们目前正在尝试将其与主项目合并。同时您可以在这里下载：https://github.com/GevatterGaul/formencode

还有德语的 Howto：http://techblog.auf-nach-mallorca.info/2014/08/ 19/dynamische_formulare_validieren_mit_formencode/

但是让我快速给你介绍一下示例上下文中的概要：

from formencode import validators
v = validators.RequireIfMatching('country', expected_value='US', required_fields=['state'])
v.to_python(dict(country='US', state='Virginia'))

主要好处是，与 validators.RequireIfPresent 相比，validators.RequireIfMatching 仅当给定字段与给定值匹配时才需要一个字段。在您的示例中，仅当“国家/地区”为“美国”时，才需要“州”字段。

希望我能帮忙。

Had the same problem during a project in my company. We wrote our own Formencode validator for this. We currently try to merge it with the main project. In the meantime you can download it here: https://github.com/GevatterGaul/formencode

There is also a Howto in, well, german: http://techblog.auf-nach-mallorca.info/2014/08/19/dynamische_formulare_validieren_mit_formencode/

But let me give you a quick rundown in the context of your example:

from formencode import validators
v = validators.RequireIfMatching('country', expected_value='US', required_fields=['state'])
v.to_python(dict(country='US', state='Virginia'))

The main benefit is, that in comparison to validators.RequireIfPresent, validators.RequireIfMatching only requires a field when a given field matches a given value. In your example, only if 'country' is 'US', then it requires the 'state' field.

Hope I could help.

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