如何在 django 中生成随机用户用户名并插入到数据库中

Question

我正在尝试随机生成用户名并保存到用户模型。目前我可以生成用户名，但我无法将其保存到用户模型中，我不知道该怎么做。请帮助完成它。我的表单过程没有随机用户名生成器功能。当我添加这些函数来生成自定义和随机用户名时，我遇到了很多错误，比如属性错误、未绑定错误等等

views.py

# random username generator
def userdate(dt_time):
    return str(10000*dt_time.year+100*dt_time.month+dt_time.day)

def usernameGen(names):
    names = names.split(" ") 
    for i in range(1,1000):
        first_letter = names[0][0]
        three_letter = names[-1][:3]
        number = '{:03d}'.format(random.randrange(1,1000))
        dateuser = userdate(date.today())
        username =(first_letter+three_letter+dateuser+number)

        try:
            User.objects.get(username = username)
            return usernameGen("PMK GAC")
        except User.DoesNotExist:
            return username

# registration view

def register(request, *args, **kwargs):

    if request.method == 'POST':
        username = usernameGen("PMK GAC") #calling usernameGen function
        form = CustomUserCreationForm(request.POST) #user form
        profile = ProfileForm(request.POST, request.FILES) #profile form
        if form.is_valid() and profile.is_valid():
            form.save()
            profile.save()
            # messages.success(request, 'new user is create. ')

            return render(request,'info.html')

    form = CustomUserCreationForm()
    profile = ProfileForm()

    context = {'form':form, 'profile':profile}
    return render(request, 'register.html', context)

models.py

#this models is not User model. it is additional model with One to one relationship of current user
class Profile(models.Model):
    # specified choices
    DEPARTMENT_CHOICES = (
    ("Department of Computer Science", "Department of Computer Science" ),
    ("Department of Electronics", "Department of Electronics" ),
    ("Department of Bio-Chemistry", "Department of Bio-Chemistry" ),
    ("Department of Chemistry", "Department of Chemistry" ),
    ("Department of Tamil", "Department of Tamil" ),
    ("Department of English", "Department of English" ),
    ("Department of Mathematics", "Department of Mathematics" ),
    ("Department of Physics", "Department of Physics" ),
    ("Department of Commerce", "Department of Commerce" ),
    ("Department of Business Administration", "Department of Business Administration" ),
    ("Department of Histroy", "Department of Histroy" ),
    ("Department of Economics", "Department of Economics" ),
    )

    GENDER_CHOICES = (
        ('Male', 'Male'),
        ('Female', 'Female')
    )

    user = models.OneToOneField(User, on_delete = models.CASCADE) 
    Date_Of_Birth = models.DateField(null=True)
    Department = models.CharField(null=True, max_length = 50, choices= DEPARTMENT_CHOICES, default=None)
    Phone_number = models.CharField(unique=True, null=True,max_length=10)
    Age = models.CharField(null=True, max_length = 3)
    University_Exam_No = models.CharField(null=True, max_length=10)
    Aadhar = models.CharField(null = True, max_length=12)
    Gender = models.CharField(null=True, max_length = 50, choices= GENDER_CHOICES, default=None)

    Permanent_Address = models.TextField(null=True)
    Per_Taluk = models.CharField(null=True, max_length = 30)
    Per_Pin_Code = models.CharField(null=True, max_length=6)
    Per_State = models.CharField(null=True, max_length=30)
    Per_Dist = models.CharField(null=True, max_length = 30)

    Address = models.TextField(null = True)
    Dist = models.CharField(null=True, max_length = 30)
    Taluk = models.CharField(null=True, max_length = 30)
    Pin_Code = models.CharField(null=True, max_length=6)
    State = models.CharField(null=True, max_length=30)

    Image = models.ImageField(upload_to='profiles', null = True)
    Sign = models.ImageField(upload_to='Signs', null=True)

    def __str__(self):
        return self.user.first_name

forms.py

# Here I directly created the form without creating a custom User model
# user registration form
class CustomUserCreationForm(forms.Form):

    firstname = forms.CharField(label='First Name', max_length=50, widget=forms.TextInput(attrs={'class':'form-control'}))
    lastname = forms.CharField(label='Last Name', max_length=50,widget=forms.TextInput(attrs={'class':'form-control'}))
    username = forms.CharField(label = 'Username', min_length=4, max_length=150,widget=forms.TextInput(attrs={'class':'form-control'}))
    email = forms.EmailField(label='Email id', widget=forms.EmailInput(attrs={'class':'form-control'}))
    password1 = forms.CharField(label = 'Password', widget=forms.PasswordInput(attrs={'class':'form-control'}))
    password2 = forms.CharField(label = 'Conform Password', widget=forms.PasswordInput(attrs={'class':'form-control'}))

    def clean_firstname(self):
        firstname = self.cleaned_data['firstname']
        return firstname

    def clean_lastname(self):
        lastname = self.cleaned_data['lastname']
        return lastname

    def clean_username(self):
        username = self.cleaned_data['username']
        r = User.objects.filter(username = username)
        if r.count():
            raise ValidationError('username is already exists')
        return username

    def clean_email(self):
        email = self.cleaned_data['email']
        r = User.objects.filter(email = email)
        if r.count():
            raise ValidationError('Email id is already exists')
        return email

    def clean_password2(self):
        password1 = self.cleaned_data.get('password1')
        password2 = self.cleaned_data.get('password2')

        if password1 and password2 and password1 != password2:
            raise ValidationError(' Passwords did not matching')
        return password2

    def save(self, commit = True):
        user = User.objects.create_user(
    self.cleaned_data['username'],
    first_name=self.cleaned_data['firstname'],
    last_name=self.cleaned_data['lastname'],
    email=self.cleaned_data['email'],
    password=self.cleaned_data['password1']
)

        return user

# profile model form.it is model forms of Profile model
class ProfileForm(forms.ModelForm):
    class Meta:
        model = Profile
        fields = '__all__'
        exclude = ['user']
        widgets = {
            'Date_Of_Birth':forms.DateInput(attrs={'class':'form-control', 'placeholder':'YYYY-MM-DD'}),
            'Department':forms.Select(attrs = {'class':'form-control'}),
            'Phone_number':forms.NumberInput(attrs = {'class':'form-control'}),
            'Age':forms.TextInput(attrs={'class':'form-control'}),
            'University_Exam_No':forms.TextInput(attrs={'class':'form-control'}),
            'Aadhar':forms.TextInput(attrs={'class':'form-control'}),
            'Gender':forms.Select(attrs = {'class':'form-control'}),

            'Permanent_Address':forms.Textarea(attrs = {'class':'form-control rounded', 'rows':3, 'cols':3}),
            'Per_Taluk':forms.TextInput(attrs={'class':'form-control'}),
            'Per_Pin_Code':forms.NumberInput(attrs = {'class':'form-control'}),
            'Per_State':forms.TextInput(attrs={'class':'form-control'}),
            'Per_Dist':forms.TextInput(attrs={'class':'form-control'}),

            'Address':forms.Textarea(attrs = {'class':'form-control rounded','rows':3, 'cols':3}),
            'Taluk':forms.TextInput(attrs={'class':'form-control'}),
            'Pin_Code':forms.NumberInput(attrs = {'class':'form-control'}),
            'State':forms.TextInput(attrs={'class':'form-control'}),
            'Dist':forms.TextInput(attrs={'class':'form-control'}),

            'Image':forms.FileInput(attrs={'class':'form-control'}),
            'Sign':forms.FileInput(attrs={'class':'form-control'}),
        }

Answer 1

如果您有一个创建新用户的表单，那么他们也会填写用户名字段。 但无论如何，对于任何模型的任何新对象，您都可以覆盖保存功能，或者至少在将其保存到数据库之前为对象添加一些属性。

例如在你的modelAdmin的admin.py中添加这个（根据https://docs.djangoproject.com/en/dev/ref/contrib/admin/#django.contrib.admin.ModelAdmin.save_model）：

@admin.register(MyCustonUser)
classs MyCustomUserAdmin(admin.ModelAdmin):
    def save_model(self, request, obj, form, change):
        obj.username = Your_Username_Gen_Functio()
        super().save_model(request, obj, form, change)

在views.py中也可以这样做 在views.py中：

def register(request):
     ......
     username = random_str(15)
     new_user = User.objects.create(
         username=username,
         #other_fields = form.other_fields
      )
      new_user.save()

给一个整数 N 得到一个长度为 N 的随机字符串：

import random
random_string = lambda N: ''.join(random.SystemRandom().choice(string.ascii_uppercase + string.ascii_lowercase + string.digits) for _ in range(N)