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wtforms自定义验证器-radiofield上的requiredif

wtforms flask-wtforms radio-button flask validation

1

machump · 技术社区 · 8 年前

我借用了一个验证器,如果另一个字段的值是某个值,则需要用户输入数据:

class RequiredIf(object):
    def __init__(self, *args, **kwargs):
            self.conditions = kwargs
    def __call__(self, form, field):
            for name, data in self.conditions.items():
                if name not in form._fields:
                    Optional(form, field)
                else:
                    condition_field = form._fields.get(name)
                if condition_field.data == data and not field.data:
                    DataRequired()(form, field)
                    Optional()(form, field)

当包含 validator 论点是 TextField ,但当字段是 RadioField . 我如何适应验证器,这也适用于放射性纤维?

就目前而言,无论验证条件是否适用, not a valid choice 总是为无线电波场返回。

提前谢谢。

例如:

class new_form(Form):
    code=BooleanField('Do you code?')
    code2=RadioField('If so, what languages do you use?',
        choices=[('python','python'),('C++','C++')],
        validators=[RequiredIf(code=1)])

不管布尔场 code 是否检查过, this is not a valid choice 总是为了 code2 . 我想要一个验证器,它要求输入任何类型的字段(包括radiofield),条件是另一个字段的值( code=1 在这种情况下)。

1 回复 | 直到 8 年前

1

Danila Ganchar 8 年前

更新! . 您可以使用任何自定义处理 __call__ . 例子:

from multidict import CIMultiDict
from wtforms import Form, RadioField, BooleanField


class RequiredIf(object):

    def __init__(self, **kwargs):
        self.conditions = kwargs

    def __call__(self, form, field):
        # NOTE! you can create here any custom processing
        current_value = form.data.get(field.name)
        if current_value == 'None':
            for condition_field, reserved_value in self.conditions.items():
                dependent_value = form.data.get(condition_field)
                if condition_field not in form.data:
                    continue
                elif dependent_value == reserved_value:
                    # just an example of error
                    raise Exception(
                        'Invalid value of field "%s". Field is required when %s==%s' % (
                            field.name,
                            condition_field,
                            dependent_value
                        ))

class NewForm(Form):
    code = BooleanField('Do you code?')
    code2 = RadioField(
        'If so, what languages do you use?',
        choices=[('python', 'python'), ('C++', 'C++')],
        validators=[RequiredIf(code=True)])

form = NewForm(formdata=CIMultiDict(code=True, code2='python'), )
form.validate()  # valid data - without errors

# invalid data
form = NewForm(formdata=CIMultiDict(code=True), )
form.validate()  # invalid data - Exception: Invalid value of field "code2". Field is required when code==True

再举一个例子 RadioField :

class NewForm(Form):
    list_one = RadioField('City/Country', choices=['city', 'country'])
    list_two = RadioField(
        'Cities',
        choices=[('minsk', 'Minsk'), ('tbilisi', 'Tbilisi')],
        validators=[RequiredIf(list_one='city')])


form = NewForm(formdata=CIMultiDict(list_one='city', list_two='minsk'), )
form.validate()  # without errors
form = NewForm(formdata=CIMultiDict(list_one='country'), )
form.validate()  # without errors
form = NewForm(formdata=CIMultiDict(list_one='city'), )
form.validate()  # invalid data - Exception: Invalid value of field "list_two". Field is required when list_one==city

希望这有帮助。