Python 如何在Django中为概要文件更新表单使用Self.clean_用户名编写自定义用户名验证？

我是一个初学者，我还在学习Django。我正在为用户配置文件更新编写自定义表单验证。我的个人资料更新表已更新-

• 用户名
• 名字
• 姓
• 轮廓图像

首先，我使用了默认表单验证。这也很好，但我想更新错误消息，所以我尝试创建一个自定义验证函数，正如我在post in堆栈溢出中看到的那样。请在forms.py中检查我的用户名验证

那么现在的错误是什么？

现在我又面临一个问题

如果我单击更新按钮而不更改任何内容，则显示无法使用此用户名。{username在模型字段中设置为unique=True}

如果我不更新用户名，只更新名字和姓氏。它不允许出现同样的错误。“用户名已被使用”{因为该用户名已被验证，并且当前用户已使用该用户名”}

我到底想要什么？

现在我想写我自己的验证，而不是仅仅更改错误消息。我想如果有人单击更新而不更改任何数据，则不应显示错误消息

我可以独立更新每个字段。如果我不更新用户名，则不会显示错误消息

我的观点

    
@login_required()
def profile(request):
    
    if request.method=='POST':
     
        u_form = UserUpdateForm(request.POST,request.FILES,instance=request.user)
        if u_form.is_valid():
            u_form.save()
            
            messages.success(request, f'Profile Updated Succesfully')
            redirect('profile/')
    else:
        u_form = UserUpdateForm(instance=request.user)
       
    notes = UserCreatedNote.objects.filter(user=request.user)
    context = {'u_form': u_form,'notes':notes}

    
    return render(request,'profile.html',context)

from django.db import models
from django.contrib.auth.models import User
from django.contrib.auth.models import (
    BaseUserManager, AbstractBaseUser
)

# ///////////////User Manager/////////////////////
# Create your models here.
# overriding the create and superuser funciton

class MyAccountManager(BaseUserManager):
    def create_user(self,email,username,password=None):
        if not email:
            raise ValueError("Users Must Have email Address")
        if not username:
            raise ValueError("Users Must Have username")
        user = self.model(
            email=self.normalize_email(email),
            username=username,

        )
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self,email,username,password):
        user = self.create_user(
            email = self.normalize_email(email),
            username=username,
            password=password,
        )
        user.is_admin = True
        user.is_staff = True 
        user.is_superuser = True
        user.save(using=self._db)
        return user
         

# ////////////////////////////////////////////////////////////
def get_profile_image_filepath(self,filename):
    return f'profile_images/{self.pk}/{filename}' #pk= primary key


def get_default_profile_image():
    return "img/default_profile/default.png"

class KeepSafeUserModel(AbstractBaseUser):
    first_name = models.CharField(verbose_name='first_name',max_length=30,default="")
    last_name = models.CharField(verbose_name='last_name',max_length=30,default="")
    email= models.TextField(verbose_name='email',max_length=60,unique=True,primary_key=True)
    username = models.CharField(max_length=30,unique=True)
    date_joined = models.DateTimeField(verbose_name="date joined",auto_now_add=True)
    last_login = models.DateTimeField(verbose_name='last_login',auto_now=True)
    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)
    is_admin = models.BooleanField(default=False)
    is_superuser = models.BooleanField(default=False)
    profile_image = models.ImageField(max_length=225,upload_to=get_profile_image_filepath,null=True,blank=True,default=get_default_profile_image)
    #password field is buil-in
   

    objects = MyAccountManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['username']
    
    def __str__(self):
        return self.username
    
    def has_perm(self,perm,obj=None):
        return self.is_admin

    def has_module_perms(self,app_Label):
        return True
        
    def get_profile_image_filename(self):
        return str(self.profile_image)[str(self.profile_image).index('profile_images/{self.pk}/')]
        

我的车型

    
@login_required()
def profile(request):
    
    if request.method=='POST':
     
        u_form = UserUpdateForm(request.POST,request.FILES,instance=request.user)
        if u_form.is_valid():
            u_form.save()
            
            messages.success(request, f'Profile Updated Succesfully')
            redirect('profile/')
    else:
        u_form = UserUpdateForm(instance=request.user)
       
    notes = UserCreatedNote.objects.filter(user=request.user)
    context = {'u_form': u_form,'notes':notes}

    
    return render(request,'profile.html',context)

from django.db import models
from django.contrib.auth.models import User
from django.contrib.auth.models import (
    BaseUserManager, AbstractBaseUser
)

# ///////////////User Manager/////////////////////
# Create your models here.
# overriding the create and superuser funciton

class MyAccountManager(BaseUserManager):
    def create_user(self,email,username,password=None):
        if not email:
            raise ValueError("Users Must Have email Address")
        if not username:
            raise ValueError("Users Must Have username")
        user = self.model(
            email=self.normalize_email(email),
            username=username,

        )
        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self,email,username,password):
        user = self.create_user(
            email = self.normalize_email(email),
            username=username,
            password=password,
        )
        user.is_admin = True
        user.is_staff = True 
        user.is_superuser = True
        user.save(using=self._db)
        return user
         

# ////////////////////////////////////////////////////////////
def get_profile_image_filepath(self,filename):
    return f'profile_images/{self.pk}/{filename}' #pk= primary key


def get_default_profile_image():
    return "img/default_profile/default.png"

class KeepSafeUserModel(AbstractBaseUser):
    first_name = models.CharField(verbose_name='first_name',max_length=30,default="")
    last_name = models.CharField(verbose_name='last_name',max_length=30,default="")
    email= models.TextField(verbose_name='email',max_length=60,unique=True,primary_key=True)
    username = models.CharField(max_length=30,unique=True)
    date_joined = models.DateTimeField(verbose_name="date joined",auto_now_add=True)
    last_login = models.DateTimeField(verbose_name='last_login',auto_now=True)
    is_active = models.BooleanField(default=True)
    is_staff = models.BooleanField(default=False)
    is_admin = models.BooleanField(default=False)
    is_superuser = models.BooleanField(default=False)
    profile_image = models.ImageField(max_length=225,upload_to=get_profile_image_filepath,null=True,blank=True,default=get_default_profile_image)
    #password field is buil-in
   

    objects = MyAccountManager()

    USERNAME_FIELD = 'email'
    REQUIRED_FIELDS = ['username']
    
    def __str__(self):
        return self.username
    
    def has_perm(self,perm,obj=None):
        return self.is_admin

    def has_module_perms(self,app_Label):
        return True
        
    def get_profile_image_filename(self):
        return str(self.profile_image)[str(self.profile_image).index('profile_images/{self.pk}/')]
        

forms.py

class UserUpdateForm(forms.ModelForm):

    profile_image = forms.ImageField(required=False,error_messages ={'invalid':("Image files only")},widget=forms.FileInput)
    class Meta:
        model = KeepSafeUserModel
        fields = ['username','first_name','last_name','profile_image']
        labels ={
            'username':'Username',
            'first_name':'First Name',
            'last_name':'Last Name',
            'profile_image':'Profile Image'
        }
    def clean_username(self):
        username = self.cleaned_data['username']
        
        if not username.isdigit():
            users = KeepSafeUserModel.objects.filter(username__iexact=username)
            if users:
                raise forms.ValidationError("Username has already taken by someone else")
        else:
            raise forms.ValidationError("Username can't contains only numbers")
        return username

---

我认为您已经将用户登录的实例传递到表单中。因此您需要将

clean\u用户名（self）

验证变成这样

def clean_username(self):
    username = self.cleaned_data['username']

    if not username.isdigit():
        users = KeepSafeUserModel.objects.filter(username__iexact=username)
        if users:
            if users.username != self.instance.username:
                raise forms.ValidationError("Username has already taken by someone else")
    else:
        raise forms.ValidationError("Username can't contains only numbers")
    return username

---

它将验证给定的用户名和存储的用户名是否不同

我认为您已经将用户登录的实例传递到表单中。因此您需要将

清除用户名（self）

验证变成这样

def clean_username(self):
    username = self.cleaned_data['username']

    if not username.isdigit():
        users = KeepSafeUserModel.objects.filter(username__iexact=username)
        if users:
            if users.username != self.instance.username:
                raise forms.ValidationError("Username has already taken by someone else")
    else:
        raise forms.ValidationError("Username can't contains only numbers")
    return username

---

它将验证给定和存储的用户名是否不相同

问题是，如果您更新

KeepSafeUserModel

，您将对

KeepSafeUserModel.objects.filter（username\uu iexact=username）

：事实上，它只会与自身匹配

您只需使用以下方法排除对象：

def clean_username(self):
    username = self.cleaned_data['username']
    
    if not username.isdigit():
        users = KeepSafeUserModel.objects.exclude(pk=self.instance.pk).filter(
            username__iexact=username
        ).exists()
        if users:
            raise forms.ValidationError"Username has already taken by someone else")
    else:
        raise forms.ValidationError("Username can't contains only numbers")
    return username

def clean_用户名（self）：
username=self.cleaned_数据['username']
如果不是username.isdigit（）：
users=KeepSafeUserModel.objects.exclude（pk=self.instance.pk）.filter(
username\uuu iexact=用户名
).exists（）
如果用户：
raise forms.ValidationError“用户名已被其他人使用”）
其他：
raise forms.ValidationError（“用户名不能只包含数字”）
返回用户名

问题是，如果更新您的

KeepSafeUserModel

，您将对

KeepSafeUserModel.objects.filter（username\uu iexact=username）

产生影响：实际上，它只会与自身匹配

您只需使用以下方法排除对象：

def clean_username(self):
    username = self.cleaned_data['username']
    
    if not username.isdigit():
        users = KeepSafeUserModel.objects.exclude(pk=self.instance.pk).filter(
            username__iexact=username
        ).exists()
        if users:
            raise forms.ValidationError"Username has already taken by someone else")
    else:
        raise forms.ValidationError("Username can't contains only numbers")
    return username

def clean_用户名（self）：
username=self.cleaned_数据['username']
如果不是username.isdigit（）：
users=KeepSafeUserModel.objects.exclude（pk=self.instance.pk）.filter(
username\uuu iexact=用户名
).exists（）
如果用户：
raise forms.ValidationError“用户名已被其他人使用”）
其他：
raise forms.ValidationError（“用户名不能只包含数字”）
返回用户名

我认为这会给出错误，因为用户包含querydict。我认为这会给出错误，因为用户包含querydict。