WTForms：即使数据存在，跳过可选的验证器

Question

这是简化的代码：

from wtforms import (
    Form,
    StringField,
    validators,
)


class UserForm(Form):
    email = StringField('Email', validators=[
        validators.Optional(),
        validators.Email(),
    ])


form = UserForm(data={'email': ''})
form.validate()
print(form.errors)  # No errors as expected

form = UserForm(data={'email': 'lem'})
form.validate()
print(form.errors)  # This should have an error

form = UserForm(data={'email': '[email protected]'})
form.validate()
print(form.errors)  # No errors as expected

输出：

{}
{}
{}

[看起来好像具有Optional跳过成功的验证，无论该字段中是否有数据。我怀疑这可能与通过数据传递命令有关。我不确定。

删除validators.Optional给了我我期望的内容：

{'email': ['Invalid email address.']}
{'email': ['Invalid email address.']}
{}

这与具有电子邮件验证程序的电子邮件字段无关。即使当我有validators.Length(min=5)时，也存在相同的问题。

Answer 1

from werkzeug import MultiDict
from wtforms import Form, StringField, validators

class UserForm(Form):
    email = StringField('Email', validators=[validators.Optional(), validators.Email()]

form = UserForm(formdata=MultiDict({'email': 'lem'}))
form.validate()