Django 1.9检查电子邮件已存在

Question

我的网站已设置，因此没有用户名（或者user.username = user.email）。如果用户尝试输入已经在数据库中的用户名，Django会出现错误消息，但由于我没有使用用户名进行注册，因此我无法弄清楚如何执行此操作。

就像现在的默认设置一样，我不想重新加载页面以查明是否有已经与用户关联的电子邮件地址。我的猜测是使用Ajax，但我无法弄清楚如何去做。我看了其他帖子，但似乎没有任何近期的事情。

如何检查电子邮件地址是否已经存在，如果有，请给出错误信息让用户输入新的电子邮件地址？

models.py：

class MyUsers(models.Model): 
    user = models.OneToOneField(User) 
    first_name = models.CharField(max_length=100, blank=True) 
    last_name = models.CharField(max_length=100, blank=True) 
    email = models.EmailField(max_length=100, blank=True, unique=True) 
    company = models.CharField(max_length=100, blank=True, null=True) 
    website = models.URLField(max_length=100, blank=True, null=True) 
    phone_number = models.CharField(max_length=100, blank=True, null=True) 

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

forms.py：

class UserForm(forms.ModelForm): 
    class Meta: 
     model = User 
     fields = ('email',) 


class UserProfileForm(forms.ModelForm): 
    class Meta: 
     model = UserProfile 
     fields = ('first_name', 'last_name', 'company', 'website', 'phone_number') 

views.py：

def index(request): 
    registered = False 

    if request.method == 'POST': 
     user_form = UserForm(data=request.POST) 
     profile_form = UserProfileForm(data=request.POST) 

     if user_form.is_valid() and profile_form.is_valid(): 
      user = user_form.save() 
      user.set_password(user.password) 
      user.password = "" 
      user.username = user.email 
      user.save() 

      profile = profile_form.save(commit=False) 
      profile.user = user 
      profile.email = user.email 
      profile.save() 

      user.first_name = profile.first_name 
      user.last_name = profile.last_name 
      user.save() 

      registered = True 
      return HttpResponseRedirect(reverse('registration')) 
     else: 
      print user_form.errors, profile_form.errors 
    else: 
     user_form = UserForm() 
     profile_form = UserProfileForm1() 

    context = {'user_form': user_form, 'profile_form': profile_form, 'registered': registered} 
    return render(request, 'mysite/register.html', context) 

register.html：

{% extends 'mysite/base.html' %} 
{% load staticfiles %} 

{% block title_block %} 
    Register 
{% endblock %} 

{% block head_block %} 
{% endblock %} 

{% block body_block %}  
    <form id="user_form" method="post" action="/mysite/" enctype="multipart/form-data"> 
     {% csrf_token %} 
     {{ user_form.as_p }} 
     {{ profile_form.as_p }} 

     <input type="submit" name="submit" value="Register" /> 
    </form> 
{% endblock %} 

Answer 1

您可以覆盖UserForm上的clean_<INSERT_FIELD_HERE>()方法来检查这种特定情况。它会是这个样子：

forms.py：

class UserForm(forms.ModelForm): 
    class Meta: 
     model = User 
     fields = ('email',) 

    def clean_email(self): 
     # Get the email 
     email = self.cleaned_data.get('email') 

     # Check to see if any users already exist with this email as a username. 
     try: 
      match = User.objects.get(email=email) 
     except User.DoesNotExist: 
      # Unable to find a user, this is fine 
      return email 

     # A user was found with this as a username, raise an error. 
     raise forms.ValidationError('This email address is already in use.') 

class UserProfileForm(forms.ModelForm): 
    class Meta: 
     model = UserProfile 
     fields = ('first_name', 'last_name', 'company', 'website', 'phone_number') 

你可以阅读更多有关清洁特定字段的形式在Django documentation约形式。

这就是说，我认为你应该考虑创建一个custom user model而不是将你的User Profile类作为User的包装。