Django 注册 - 需要一种简单的方法将用户名默认为随机生成的字符串

Question

我正在使用 Django 注册。它提供了处理 registration_form.html 的 View ，该 html 当前包含用户名、密码 1、密码 2 和电子邮件作为我的应用程序中的用户可输入字段。我有一个非常简单的随机用户名生成器，我想用它在 registration_form.html 中预填充用户名并将其设置为“只读”。我很难弄清楚应该在 Django Registration 中的哪个位置进行调整。我相信它就在这里的某个地方:

class RegistrationView(_RequestPassingFormView):
"""
Base class for user registration views.

"""
disallowed_url = 'registration_disallowed'
form_class = RegistrationForm
http_method_names = ['get', 'post', 'head', 'options', 'trace']
success_url = None
template_name = 'registration/registration_form.html'

def dispatch(self, request, *args, **kwargs):
    """
    Check that user signup is allowed before even bothering to
    dispatch or do other processing.

    """
    if not self.registration_allowed(request):
        return redirect(self.disallowed_url)
    return super(RegistrationView, self).dispatch(request, *args, **kwargs)

def form_valid(self, request, form):
    new_user = self.register(request, **form.cleaned_data)
    success_url = self.get_success_url(request, new_user)

    # success_url may be a simple string, or a tuple providing the
    # full argument set for redirect(). Attempting to unpack it
    # tells us which one it is.
    try:
        to, args, kwargs = success_url
        return redirect(to, *args, **kwargs)
    except ValueError:
        return redirect(success_url)

def registration_allowed(self, request):
    """
    Override this to enable/disable user registration, either
    globally or on a per-request basis.

    """
    return True

def register(self, request, **cleaned_data):
    """
    Implement user-registration logic here. Access to both the
    request and the full cleaned_data of the registration form is
    available here.

    """
    raise NotImplementedError

更新:

因此，根据最初的响应，我开始对现有的 RegistrationView 进行快速编辑，如下所示:

class RegistrationForm(forms.Form):
required_css_class = 'required'

# username = forms.RegexField(regex=r'^[\w.@+-]+$',
#                             max_length=30,
#                             label=_("Username"),
#                             error_messages={'invalid': _("This value may contain only letters, numbers and @/./+/-/_ characters.")})   
# My new username stuff here:                     
n = random.randint(1,9999999)
default_username = 'AnonMom%d' % (n,) 
username = forms.CharField(initial="default_username") 
email = forms.EmailField(label=_("E-mail"))
password1 = forms.CharField(widget=forms.PasswordInput,
                            label=_("Password"))
password2 = forms.CharField(widget=forms.PasswordInput,
                            label=_("Password (again)"))

我期待看到我的默认用户名显示在 registration.form.html 中，定义如下:

<form method="post" action=".">{% csrf_token %}

<p><input id="id_username" maxlength="25" name="username" type="text" autocomplete="off"></p>
<p style="font-size:12px; color:#999">Make it anonymous but easy to remember. 25 chars max. No spaces.</p>  
<p><input id="id_password1" name="password1" type="password" placeholder="Password"/></p>
<p><input id="id_password2" name="password2" type="password" placeholder="Password (Confirm)"/></p>
<p><input id="id_email" name="email" type="email" placeholder="Email (Never displayed)" autocomplete="off"/></p>

但是该字段是空的。如果我只设置 initial="xxx"，它甚至是空的。我做错了什么？

更新 2:

使用上面的代码以及以下对 View 和表单的轻微柚木，所有这些都可以正常工作:

class RegistrationForm(forms.Form):                           
    n = random.randint(1,9999999)
    username = forms.CharField(initial='MomzAnon%d' % (n,) ) 
    ...

<form method="post" action=".">{% csrf_token %}
    <p><input id="id_username" maxlength="25" name="username" type="text" 
    value="{{ form.username.value }}" readonly autocomplete="off"></p>
    ...

最后一个问题:是否有任何理由将 RegistrationForm 子类化而不是仅仅编辑它？就代码行而言，我的方法似乎非常简单。

更新 3:似乎我每次调用此表单时都不会自动生成我的随机用户名。所以我回到这个创建了一个用户的表单，发现自动生成的用户名与上次用户注册没有变化。每次向用户显示此表单时，如何强制重新生成用户名？

更新 4:我通过将用户名逻辑移至此处解决了更新 3 中概述的问题。此代码还包括一个调整，以确保我随机生成的用户名也是唯一的:

def __init__(self, *args, **kwargs):
    super(RegistrationForm, self).__init__(*args, **kwargs)

    n = random.randint(1,999999) 
    new_username = 'anon%d' % (n,) 

    while User.objects.filter(username=new_username).exists():
        n = random.randint(1,999999)
        new_username = 'anon%d' % (n,) 

    self.fields['username'] = forms.CharField(initial=new_username)

Answer 1

您可以继承 RegistrationForm 并通过添加 readonly 小部件属性将用户名字段设置为只读:

from registration.forms import RegistrationForm

class MyForm(RegistrationForm):
    username = forms.CharField(max_length=30, label=_("Username"),
                           widget=forms.TextInput(attrs={'readonly':'readonly'}))

在您的 RegistrationView 子类中，将 form_class 更改为您的表单类并覆盖 get_initial 函数(您的生成随 secret 码代码可以放在此处) :

class MyReg(RegistrationView):
    form_class = MyForm

    def get_initial(self, *args, **kwargs):
        self.initial = {'username': self.gen_randrom_username()}
        return super(Myreg, self).get_initial(*args, **kwargs)

    def gen_randrom_username(self):
        # gen name
        return random_username