重复的密钥值违反了唯一约束“验证用户用户名密钥”详细信息:密钥(用户名)=(无)已经存在

Question

我想使用自定义寄存器模型注册用户，但我一直收到以下错误：

重复的键值违反了唯一约束“auth_user_username_key”详细信息：键（username）=（无）已存在

我如何修复这个错误。

这是我到目前为止创建的代码:

在 urls.py 我为各个页面创建URL配置。

from django.conf.urls import url
from django.contrib.auth.views import login


from . import views

urlpatterns = [

    url(r'^$', views.nest, name = 'nest'),

    url(r'^login/$', login, {'template_name' : 'Identities/login.html'}, name = 'login'),

    url(r'^register/$', views.register, name = 'register'),
]

形式。py我创建自定义注册表单。

from django import forms
from django.contrib.auth.models import User
from django.contrib.auth.forms import UserCreationForm

# Create custom user registration


class CreateAccountForm(UserCreationForm):

    email = forms.EmailField(required = True)


    class Meta:

        model = User

        fields = (

            'first_name',
            'last_name',
            'email',
            'password1',
            'password2'
        )

        def save(self, commit = True):
            user = super(CreateAccountForm, self).save(commit = False)
            user.first_name = self.cleaned_data['first_name']
            user.last_name = self.cleaned_data['last_name']
            user.email = self.cleaned_data['email']

            if commit:

                user.save()

            return user

views.py我创建了寄存器视图函数。

from django.shortcuts import render, redirect
from Identities.forms import CreateAccountForm

# Create your views here.

def nest(request):
    return render(request, 'Identities/nest.html')


def register(request):

    if request.method == 'POST':

        form = CreateAccountForm(request.POST)

        if form.is_valid():
            form.save()

        else:
            return redirect(reverse('Identities:logout'))

    else:

        form = CreateAccountForm()
        var = {'form' : form}
        return render(request, 'Identities/create_account.html', var)

Answer 1

你真的应该试试下面的东西。在这里，我已将用户名包含在表单字段中。由于用户名是唯一的，因此应将其包含在表单字段中。在保存方法中，self.cleaned_data。get（“username”，None）如果请求中没有发布任何内容，则会将None带到username字段。如果没有给定值，则db期望为None，但如果不在save方法中指定它，它将接收空字符串，这将导致重复键错误。请注意，Django不会将空值存储为None，而是使用空字符串。

from django import forms
from django.contrib.auth.models import User
from django.contrib.auth.forms import UserCreationForm

# Create custom user registration


class CreateAccountForm(UserCreationForm):

    email = forms.EmailField(required = True)


    class Meta:

        model = User

        fields = (
            'username',
            'first_name',
            'last_name',
            'email',
            'password1',
            'password2'
        )

        def save(self, commit = True):
            user = super(CreateAccountForm, self).save(commit = False)
            user.username = self.cleaned_data.get("username", None)
            user.first_name = self.cleaned_data.get("first_name", None)
            user.last_name = self.cleaned_data.get("last_name", None)
            user.email = self.cleaned_data.get("email", None)

            if commit:

                user.save()

            return user

Answer 2

您需要在表单中包含用户名。因为用户名是唯一字段，不能在表单中排除。如果您在表单中将其排除，则需要通过为每个用户生成唯一用户名来处理，这有点繁琐。

class CreateAccountForm(UserCreationForm):
    email = forms.EmailField(required = True)

    class Meta:
        model = User

        fields = (
             'username'
             'first_name',
             'last_name',
             'email',
             'password1',
             'password2'
        )
   . . . . . .
   . . . . . .