如何解决form.ValidationError未显示在模板中
我是Django的新手，请原谅一些错误。 我正在尝试为电子邮件创建验证系统，并将这些错误（如果有的话）打印到模板中。 为了明确起见，我能够创建新用户并重定向到登录页面，但是我无法显示错误消息。 如果这是一个小问题，我确实表示歉意，但我对此坚持了2天。 我已经在youtube上尝试了该视频：并且我尝试了以下post的操作，但此操作无效。
forms.py
from django.forms import ModelForm
from django.contrib.auth.forms import UserCreationForm
from django.contrib.auth.models import User
from django import forms
# This class will overwrite origginal UserCreationForm0
class createuserForm(UserCreationForm):
email = forms.EmailField(required = True)
class Meta:
model = User
# this will add email to our register_form
fields = [
'username','email','password1','password2'
]
def clean(self):
cleaned_data = super(createuserForm,self).clean()
email = self.cleaned_data.get('email')
if User.objects.filter(email=email).exists():
raise forms.ValidationError('User with same email already exists')
return cleaned_data
views.py
from django.shortcuts import render,redirect
from .forms import createuserForm
from django.contrib.auth import login,authenticate,logout
from django.contrib.auth.forms import AuthenticationForm
from django.contrib import messages
# Create your views here.
def registration_page(request):
if request.user.is_authenticated:
return redirect('')
else:
form = createuserForm()
if request.method == 'POST':
form = createuserForm(request.POST)
if form.is_valid():
form.save()
messages.success(request,'User has been successefly registered,Please Log In!')
return redirect('accounts:login')
else:
createuserForm()
context = {
'form': form
}
return render(request,'accounts/register.html',context)
register.html
<form class="form-horizontal" method="post">
{% csrf_token %}
<div class="form-group">
<label for="email" class="cols-sm-2 control-label">Your Email</label>
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-envelope fa" aria-hidden="true"></i></span>
{{form.email}}
</div>
</div>
</div>
<div class="form-group">
<label for="username" class="cols-sm-2 control-label">Username</label>
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-users fa" aria-hidden="true"></i></span>
{{form.username}}
</div>
</div>
</div>
<div class="form-group">
<label for="password" class="cols-sm-2 control-label">Password</label>
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock fa-lg" aria-hidden="true"></i></span>
{{form.password1}}
</div>
</div>
</div>
<div class="form-group">
<label for="confirm" class="cols-sm-2 control-label">Confirm Password</label>
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock fa-lg" aria-hidden="true"></i></span>
{{form.password2}}
</div>
</div>
</div>
<p>{{form.email.errors}}</p>
<p>{{form.password.errors}}</p>
<div class="form-group ">
<input type="submit" value="Register" class="btn btn-primary btn-lg btn-block login-button">
</div>
<div class="login-register">
<a href="{% url 'accounts:login' %}">Login</a>
</div>
</form>
解决方法
由clean方法引发的没有附加字段的错误被添加到.non_field_errors() [Django-doc]中。因此，您应使用以下命令呈现这些内容：
<p>{{ form.non_field_errors }}</p>
<p>{{ form.username.errors }}</p>
<p>{{ form.email.errors }}</p>
<p>{{ form.password1.errors }}</p>
<p>{{ form.password2.errors }}</p>话虽这么说，（1）此错误 是特定于字段的，所以最好使用clean_email方法清除此错误； （2）如果 model 字段被标记为唯一，则Django模型表单可以检查唯一性。
class CreateUserForm(UserCreationForm):
email = forms.EmailField(required=True)
class Meta:
model = User
fields = [
'username','email','password1','password2'
]
def clean_email(self):
email = self.cleaned_data['email']
if User.objects.exclude(pk=self.instance.pk).filter(email=email).exists():
raise forms.ValidationError('User with same email already exists')
return email如果表单的包装实例已经保存在数据库中，则.exclude(…)很有用。
您可以添加此行
<form class="form-horizontal" method="post">
{% csrf_token %}
<div class="form-group">
<label for="email" class="cols-sm-2 control-label">Your Email</label>
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-envelope fa" aria-hidden="true"></i></span>
{{form.email}}
</div>
</div>
</div>
<div class="form-group">
<label for="username" class="cols-sm-2 control-label">Username</label>
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-users fa" aria-hidden="true"></i></span>
{{form.username}}
</div>
</div>
</div>
<div class="form-group">
<label for="password" class="cols-sm-2 control-label">Password</label>
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock fa-lg" aria-hidden="true"></i></span>
{{form.password1}}
</div>
</div>
</div>
<div class="form-group">
<label for="confirm" class="cols-sm-2 control-label">Confirm Password</label>
<div class="cols-sm-10">
<div class="input-group">
<span class="input-group-addon"><i class="fa fa-lock fa-lg" aria-hidden="true"></i></span>
{{form.password2}}
</div>
</div>
</div>
<p>{{form.email.errors}}</p>
<p>{{form.password2.errors}}</p>
<p>{{form.username.errors}}</p>
<div class="form-group ">
<input type="submit" value="Register" class="btn btn-primary btn-lg btn-block login-button">
</div>
<div class="login-register">
<a href="{% url 'accounts:login' %}">Login</a>
</div>
</form>
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