python - 我如何为 Django 注册创建自定义 Django 后端？

Question

我读过这个

http://docs.b-list.org/django-registration/0.8/backend-api.html

而且我尝试过制作自己的后端。我这样做是因为我想创建一个后端，不允许使用相同的电子邮件进行注册，并且我想更改电子邮件错误消息。我也想加入我自己的领域!

这是我想出的:

from django import forms
from registration.forms import RegistrationForm
from django.utils.translation import ugettext_lazy as _
from django.contrib.auth.models import User
from registration.forms import attrs_dict

class customRegistrationForm(RegistrationForm):
    email2 = forms.EmailField(widget=forms.TextInput(attrs=dict(attrs_dict,
        maxlength=75)),
        label=_("Confirm email"))

    def clean_email(self):
        """
        Validate that the email is alphanumeric and is not already
        in use.
        """
        try:
            email = User.objects.get(email__iexact=self.cleaned_data['email'])
        except User.DoesNotExist:
            return self.cleaned_data['email']
        raise forms.ValidationError(_("That email already exists - if you have forgotten your password, go to the login screen and then select \"forgot password\""))

    def clean(self):
        """
        Verifiy that the values entered into the two email fields
        match. Note that an error here will end up in
        ``non_field_errors()`` because it doesn't apply to a single
        field.

        """
        if 'email' in self.cleaned_data and 'email2' in self.cleaned_data:
            if self.cleaned_data['email'] != self.cleaned_data['email2']:
                raise forms.ValidationError(_("The two email fields didn't match."))
        return super(RegistrationForm,clean)

以上内容在我的init.py 文件中(不管是什么)

然后，我的 urls.py 代码中有:

url(r'^accounts/register/$',
    register,
        { 'backend': 'myapp.forms.customRegistrationForm' },
    name='registration_register'),
... #other urls here!

现在，当我转到/accounts/register 页面时，出现以下错误:

AttributeError at /accounts/register/

'customRegistrationForm' object has no attribute 'registration_allowed'

这很奇怪。它似乎在告诉我，我需要将“registration_allowed”方法添加到我的子类中。但是，该子类是 RegistrationForm 的子类，它工作正常并且没有定义那些东西......我知道我可以添加这些成员，但它似乎违背了扩展的目的，对吧？

更新

这是现在可以运行的代码!

我将不同的类分解为不同文件夹中的不同 init.py 文件 - 一个称为“forms”，一个称为“backends”，两者都位于我的文件夹“djangoRegistration”中主要项目。

/forms/init.py

from django import forms
from registration.forms import RegistrationForm
from django.utils.translation import ugettext_lazy as _
from django.contrib.auth.models import User
from registration.forms import attrs_dict

class customRegistrationForm(RegistrationForm):
    def __init__(self, *args, **kw):
        super(RegistrationForm, self).__init__(*args, **kw)
        self.fields.keyOrder = [
            'username',
            'email',
            'email2',
            'password1',
            'password2'
        ]

    email2 = forms.EmailField(widget=forms.TextInput(attrs=dict(attrs_dict,
        maxlength=75)),
        label=_("Confirm email"))

    def clean_email(self):
        """
        Validate that the email is alphanumeric and is not already
        in use.
        """
        try:
            email = User.objects.get(email__iexact=self.cleaned_data['email'])
        except User.DoesNotExist:
            return self.cleaned_data['email']
        raise forms.ValidationError(_("That email already exists - if you have forgotten your password, go to the login screen and then select \"forgot password\""))

    def clean(self):
        """
        Verifiy that the values entered into the two email fields
        match. Note that an error here will end up in
        ``non_field_errors()`` because it doesn't apply to a single
        field.

        """
        if 'email' in self.cleaned_data and 'email2' in self.cleaned_data:
            if self.cleaned_data['email'] != self.cleaned_data['email2']:
                raise forms.ValidationError(_("The two email fields didn't match."))
        return super(RegistrationForm,clean)

/backends/init.py

from registration.backends.default import DefaultBackend
from dumpstownapp.djangoRegistration.forms import customRegistrationForm

class customDefaultBackend(DefaultBackend):
    def get_form_class(self, request):
        """
        Return the default form class used for user registration.

        """
        return customRegistrationForm

最后，我的 urls.py 只是引用了新的后端:

url(r'^accounts/register/$',
    register,
        { 'backend': 'myapp.djangoRegistration.backends.customDefaultBackend' },
    name='registration_register'),
#more urls here! yay!

作为最后的说明，我必须添加一些代码来“排序”字段的显示方式，这就是 customRegistrationForm 中的 init 方法所做的

谢谢!

Answer 1

您正在尝试使用表单作为后端，但这根本不是后端。正如您链接到的文档所解释的那样，后端是一个实现某些方法的类，包括 registration_allowed。该表单没有实现任何这些，这并不奇怪，因为它用于用户输入和验证，而不是后端操作。

但是，该页面确实给出了有关实现它的正确方法的提示。后端可以定义的方法之一是 get_form_class()，它返回要使用的表单类。因此，您似乎需要的是一个自定义后端，它继承自 registration.backends.default.DefaultBackend 并仅覆盖 get_form_class 方法，该方法仅返回 customRegistrationForm 。