Question

我正在尝试检查输入的电子邮件地址和表单用户名是否曾被使用过。代码适用于数据库中不存在电子邮件地址和用户名的情况，但是我在views.py中获得了无效的表单。我想在用户尝试提交时在表单中显示文本验证错误消息。

forms.py

 class UpdateProfileForm(ModelForm):

  class Meta:
    model = UpdatedInformation
    fields = ('email', 'username',)

 def clean_email(self):
    username = self.cleaned_data.get('username')
    email = self.cleaned_data.get('email')
    if email and User.objects.filter(email=email).exclude(username=username).count():
        raise forms.ValidationError('This email address is already in use. Please supply a different email address.')
    return email

 def clean_username(self):
    username = self.cleaned_data.get('username')
    email = self.cleaned_data.get('email')
    if email and User.objects.filter(username=username).exclude(email=email).count():
        raise forms.ValidationError(
            'This username is already in use. Please supply a different username.')
    return username

views.py

@login_required
def update_profile(request, slug):
args = {}

#Check that the correct user has requested
if not slug == slugify(request.user.username):
    raise Http404

#Get the user object from the database by its username
user = get_object_or_404(User, username=request.user.username)

#Create a new updated information object to initialise the form with
update_profile_obj = UpdatedInformation()
update_profile_obj.username = user.username
update_profile_obj.email = user.email

if request.method == 'POST':
    form = UpdateProfileForm(request.POST)
    print(form.errors)
    if form.is_valid():

        #Get the updated_info from the form
        updated_info = form.save(commit=False)

        #Update the user object with it
        user.email = updated_info.email
        user.username = updated_info.username

        #Check if either the username and email address has already been used
        if User.objects.filter(email=updated_info.email).exclude(username=updated_info.username).count():
            raise Http404

        if User.objects.filter(username=updated_info.username).exclude(email=updated_info.email).count():
            raise Http404

        #Save the updated user object within the database
        user.save()
        return redirect('account')

    if not form.is_valid():
        raise Http404
else:
    form = UpdateProfileForm(instance=update_profile_obj)

args['form'] = form
return render(request, 'registration/update_profile.html', args)

html模板

    {% extends 'base.html' %}
    {% load staticfiles %}
    {% load widget_tweaks %}

    {% block content %}
<link rel="stylesheet" type="text/css" href="{% static 'css/update_profile_style.css' %}" />

<div class="update-profile-page-container">

    <h2 class="update-profile-title text-center">EDIT DETAILS</h2>


    <div class="update-form-container">

        <form id="update-form" method="POST" class="form-inline" role="form">
            {% csrf_token %}

            <div class="row">
                <h4 class="update-profile-subtitle">USERNAME</h4>
                {{ form.username |attr:"class:form-control update-form-field" }}
            </div>

            <div class="row">
                <h4 class="update-profile-subtitle">EMAIL</h4>
                {{ form.email |attr:"class:form-control update-form-field" }}
            </div>

            <div class="row">
                <div class = "container update-button-container" style="padding-left: 0;">
                    <a onclick="document.getElementById('update-form').submit();">
                        <input class="update-button center" type="button" value="SAVE">
                    </a>
                </div>
            </div>

        </form>

    </div>
</div>
{% endblock content %}

Answer 1

您应该从views.py

中删除此代码

if not form.is_valid():
    raise Http404

这样做会返回HTTP 404状态，即“找不到页面”，这是错误的。如果表单无效，那么您只想使用绑定表单呈现响应，因此如果表单无效，删除这两行将执行对render的调用。

此外，您应该删除视图中已使用的电子邮件/用户名的检查，因为如果表单有效，那么这些检查是多余的：

   #Check if either the username and email address has already been used
    if User.objects.filter(email=updated_info.email).exclude(username=updated_info.username).count():
        raise Http404

    if User.objects.filter(username=updated_info.username).exclude(email=updated_info.email).count():
        raise Http404

Django在forms.py中验证电子邮件地址和用户名

1 个答案: