我借用了一个验证器,如果另一个字段的值是某个值,则要求用户输入数据:
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
参数的字段是 TextField
时,此方法非常有效,但当该字段是 RadioField< 时,它似乎不起作用
。如何调整验证器以便它也适用于 RadioFields?
就目前情况而言,无论验证条件是否适用,RadioField 始终返回not a valid choice
。
提前致谢。
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)])
无论是否检查 BooleanField code
,code2
始终返回 这不是有效选择
。我想要一个验证器,它需要任何类型字段(包括 RadioField)的输入,并以另一个字段的值为条件(在本例中为 code=1
)。
最佳答案
已更新!。您可以使用 __call__
创建任何自定义处理。示例:
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
再一个例子,2 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。
关于validation - WTForms 自定义验证器 - RadioField 上的RequiredIf,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/50806257/