我正在尝试制作一个 Django 登录屏幕，例如当用户没有输入正确的密码时显示错误。 但我收到的唯一错误是“该用户不存在!”我怎样才能让其他错误信息显示出来？我的代码有什么问题？
表单.py
class UserLogInForm(forms.Form):
username = forms.CharField()
password = forms.CharField(widget=forms.PasswordInput)
def clean(self, *args, **kwargs):
username = self.cleaned_data.get("username")
password = self.cleaned_data.get("password")
#if username and password:
# user = get_user_model()
user = authenticate(username=username, password= password)
# user = authenticate(username=username)
if not user:
raise forms.ValidationError("This user does not exist!")
if not user.check_password(password):
raise forms.ValidationError("Incorrect password!")
if not user.is_active:
raise forms.ValidationError("This user is no longer active.")
return super(UserLogInForm, self).clean(*args, **kwargs)
View .py
def login_view(request):
title = "Login"
form = UserLogInForm(request.POST or None)
if form.is_valid():
username = form.cleaned_data.get("username")
password = form.cleaned_data.get("password")
user = authenticate(username=username, password=password)
login(request, user)
return redirect('/')
return render(request, "form.html", {"form": form, "title": title, 'errors': form.non_field_errors()})
表单.html
<form method='POST' action='' enctype="multipart/form-data">{% csrf_token %}
{{ form.non_field_errors }}
<table align="center">
<tr>
<td>{{ form.username.label_tag }}</td>
<td>{{ form.username }}</td>
</tr>
<tr>
<td>{{ form.password.label_tag }}</td>
<td>{{ form.password }}</td>
</tr>
</table>
<div id="wrapper">
<button id="button" type="submit">Login</button>
</div>
</form>
请您参考如下方法:
authenticate django.contrib.auth 中的函数是这样写的，
The function takes credentials as keyword arguments, username and password for the default case, checks them against each authentication backend, and returns a User object if the credentials are valid for a backend. If the credentials aren’t valid for any backend or if a backend raises PermissionDenied, it returns None.
所以，如果你想引发密码检查错误，应该在调用 authenticate 函数之前。您可能需要检查用户模型本身。您可以在表单或 View 中进行验证。
您可以在登录前检查用户是否有效，
from django.contrib.auth.models import User
class UserLogInForm(forms.Form):
username = forms.CharField()
password = forms.CharField(widget=forms.PasswordInput)
def clean(self, *args, **kwargs):
username = self.cleaned_data.get("username")
password = self.cleaned_data.get("password")
#if username and password:
# user = get_user_model()
try:
user = User.objects.get(username=username)
except User.DoesNotExist:
raise forms.ValidationError("This user does not exist!")
if user and not user.check_password(password):
raise forms.ValidationError("Incorrect password!"):
if user and not user.is_active:
raise forms.ValidationError("This user is no longer active.")
return super(UserLogInForm, self).clean(*args, **kwargs)
在你的 views.py 中，
user = authenticate(username=username, password=password)
if user is not None:
login(request, user)
return redirect('/')
return render(request, "form.html", {"form": form, "title": title, 'errors': form.non_field_errors()})
