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WTForms `RequiredIf` validator.
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class RequiredIf(object): | |
"""Validates field conditionally. | |
Usage:: | |
login_method = StringField('', [AnyOf(['email', 'facebook'])]) | |
email = StringField('', [RequiredIf(login_method='email')]) | |
password = StringField('', [RequiredIf(login_method='email')]) | |
facebook_token = StringField('', [RequiredIf(login_method='facebook')]) | |
""" | |
def __init__(self, *args, **kwargs): | |
self.conditions = kwargs | |
def __call__(self, form, field): | |
for name, data in self.conditions.iteritems(): | |
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: | |
Required()(form, field) | |
Optional()(form, field) |
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