如何相互验证 wtforms 字段? [英] How do I validate wtforms fields against one another?

问题描述

我在一个表单中有三个相同的 SelectField 输入，每个输入都有相同的选项集.我不能使用一个多选.

I have three identical SelectField inputs in a form, each with the same set of options. I can't use one multiple select.

我想确保用户为这三个字段选择了三个不同的选项.

I want to make sure that the user selects three different choices for these three fields.

在自定义验证中，似乎一次只能引用一个字段，而不能将此字段的值与其他字段进行比较.我怎样才能做到这一点?谢谢！

In custom validation, it appears that you can only reference one field at a time, not compare the value of this field to others. How can I do that? Thanks!

推荐答案

你可以在你的 Form...

class MyForm(Form):
    select1 = SelectField('Select 1', ...)
    select2 = SelectField('Select 2', ...)
    select3 = SelectField('Select 3', ...)
    def validate(self):
        if not Form.validate(self):
            return False
        result = True
        seen = set()
        for field in [self.select1, self.select2, self.select3]:
            if field.data in seen:
                field.errors.append('Please select three distinct choices.')
                result = False
            else:
                seen.add(field.data)
        return result

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