Question

我在django中有以下表格：

class UserEmailRegistrationForm(forms.Form):
    password = forms.PasswordField(max_length=32, label=_('Password'),
                                   validators=[validators.validate_password])
    email = forms.EmailField(label=_('Email'), 
                             validators=[validators.validate_email])
    first_name = forms.CharField(max_length=35, label=_('First name'), 
                                 validators=[validators.validate_name])
    last_name = forms.CharField(max_length=35, label=_('Last name'), 
                                validators=[validators.validate_name])

大多数验证器都是自定义的，但validate_email中显示django.core.validators。此外，这是我的观点的相关部分：

form = UserEmailRegistrationForm(PUT)       
    # Validate incoming data
    if not form.is_valid():
        return HttpResponse(form.errors.as_json(), 
                            content_type='application/json', status=422)

所有验证工作正常，但当我传递无效的电子邮件地址时，我Enter a valid email address.会form.errors两次。以下是我得到的回复：

{"email": [{"message": "Enter a valid email address.", "code": "invalid"}, {"message": "Enter a valid email address.", "code": "invalid"}]}

可能导致此问题的原因以及如何解决？

Answer 1

调试/看看发生了什么。在IDE中单击EmailField并按照层次结构...

1.您的代码：

email = forms.EmailField(label=_('Email'), 
                         validators=[validators.validate_email])

2.EmailField：

class EmailField(CharField):
    widget = EmailInput
    default_validators = [validators.validate_email]

3.CharField /没有什么有趣的。

class CharField(Field): ...

4 Field.__init__(...)：

...
self.validators = self.default_validators + validators
super(Field, self).__init__()

简而言之，您使用了两次validate_email。

Answer 2

正如François所暗示的那样，两个相同的验证器与您的email字段相关联。第一个是默认情况下，然后通过提供validators关键字参数（validators=[validators.validate_email]）的值来添加第二个。此验证器列表将附加到任何默认值。因此，您会看到2条验证错误消息。

$ python manage.py shell
>>> from django import forms
>>> from django.core import validators
>>> email = forms.EmailField(label=_('Email'), validators=[validators.validate_email])
>>> email.validators
[<django.core.validators.EmailValidator object at 0x2bc0190>, <django.core.validators.EmailValidator object at 0x2bc0190>]

因此，您可以看到上面有2个注册的验证器。当表单被验证时，两者都被执行：

>>> email.run_validators('abc@abc.com')
>>> email.run_validators('abc')
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/mhawke/virtualenvs/django_1.6/lib/python2.7/site-packages/django/forms/fields.py", line 139, in run_validators
    raise ValidationError(errors)
ValidationError: [u'Enter a valid email address.', u'Enter a valid email address.']

要修复，只需声明没有验证器的电子邮件字段：

>>> email = forms.EmailField(label=_('Email'))
>>> email.validators
[<django.core.validators.EmailValidator object at 0x2bc0190>]
>>> email.run_validators('abc@abc.com')
>>> email.run_validators('abc')
Traceback (most recent call last):
  File "<console>", line 1, in <module>
  File "/home/mhawke/virtualenvs/django_1.6/lib/python2.7/site-packages/django/forms/fields.py", line 139, in run_validators
    raise ValidationError(errors)
ValidationError: [u'Enter a valid email address.']

Django表单验证错误被复制

2 个答案: