Question

我正在使用Django 1.9.8，我正在尝试学习如何使用表单验证。我正在编写用于注册用户的表单。我遇到了两个问题。

在forms.py文件方法中无法访问重新输入密码的字段（相反，根本不存在）。当我使用raise Exception(self.cleaned_data.get('password'))查看内容时，会显示密码。我还可以查看用户名和电子邮件。当我对repassword字段执行相同操作时，会显示None 编辑 - 这是通过更改forms.py文件以使用clean（）方法来解决的
我的表单上根本没有显示验证错误。如果有错误，重定向返回到表单工作，但输入中没有任何内容供用户修复，也不显示错误。 编辑 - 通过在else语句后更改RegisterForm调用解决form = RegisterForm(request.POST)

这是forms.py文件

#forms.py
class RegisterForm(forms.Form):
    username = forms.CharField(label="Username", max_length=30,
                               widget=forms.TextInput(attrs={'class': 'form-control', 'name': 'username'}))
    email = forms.CharField(label="Email", max_length=30,
                               widget=forms.TextInput(attrs={'class': 'form-control', 'name': 'email'}))
    password = forms.CharField(label="Password", max_length=30,
                               widget=forms.TextInput(attrs={'class': 'form-control', 'name': 'password', 'type' : 'password'}))
    repassword = forms.CharField(label="RePassword", max_length=30,
                               widget=forms.TextInput(attrs={'class': 'form-control', 'name': 'repassword', 'type' : 'password'}))

    #Edit - this was changed to the clean() function in the selected answer.
    def clean_password(self):
        password1 = self.cleaned_data.get('password')
        password2 = self.cleaned_data.get('repassword')
        #raise Exception(self.cleaned_data.get('repassword')) # None is displayed

        if password1 and password1 != password2:
            raise forms.ValidationError("Passwords don't match")
        return self.cleaned_data

这是表单模板

#register.html

{% if form.errors %}
    <h2>ERROR!</h2>
    {% for field in form %}
        {% for error in field.errors %}
            <div class="alert alert-error">
                <strong>{{ error|escape }}</strong>
            </div>
        {% endfor %}
    {% endfor %}
{% endif %}

<form method="post" action="" id="RegisterForm">
{% csrf_token %}
    <p class="bs-component">
        <table>
            <tr>
                <td>{{ form.username.label_tag }}</td>
                <td>{{ form.username }}</td>
            </tr>
            <tr>
                <td>{{ form.email.label_tag }}</td>
                <td>{{ form.email }}</td>
            </tr>
            <tr>
                <td>{{ form.password.label_tag }}</td>
                <td>{{ form.password }}</td>
            </tr>
             <tr>
                <td>{{ form.repassword.label_tag }}</td>
                <td>{{ form.repassword }}</td>
            </tr>
        </table>
    </p>
    <p class="bs-component">
        <center>
            <input class="btn btn-success btn-sm" type="submit" value="Register" />
        </center>
    </p>
    <input type="hidden" name="next" value="{{ next }}" />
</form>

这是视图

#views.py
class RegisterViewSet(viewsets.ViewSet):

    #GET requests
    def register(self,request):
        return render(request, 'authorization/register.html', {'form': RegisterForm})

    #POST requests
    def create(self,request):
        form = RegisterForm(request.POST)
        if form.is_valid():
            username = request.POST['username']
            email = request.POST['email']
            password = request.POST['password']
            user = User.objects.create_user(username,email,password)
            user.save()
            return HttpResponseRedirect('/users')
        else:
            return render(request, 'authorization/register.html', {'form': RegisterForm })
            #changed the previous line to the following. This fixed the errors not displaying
            #return render(request, 'authorization/register.html', {'form': RegisterForm(request.POST) })

Answer 1

我不确定{100}确保self.cleaned_data.get('repassword')在该方法中返回None的原因，但是clean_password不适合执行相互依赖的字段的验证。

根据docs，您应该在clean()函数中执行此类验证：

<强> views.py

def register(self,request):
    form = RegisterForm() # Notice `()` at the end
    return render(request, 'authorization/register.html', {'form': form})

<强> forms.py

...

def clean(self):
    cleaned_data = super(RegisterForm, self).clean()

    password1 = cleaned_data.get('password')
    password2 = cleaned_data.get('repassword')

    if password1 and password1 != password2:
        raise forms.ValidationError("Passwords don't match")

请注意，您不必实施clean_password和clean_repassword。

（如果您认为仍需要实施clean_password，则必须从password1返回self.cleaned_data。

您还需要按照docs。

中的说明正确呈现表单错误

不要忘记将其添加到您的模板中：

{{ form.non_field_errors }}

至于第二个错误，问题是，每次验证失败时，您都会返回一个新的RegisterForm实例而不是无效的实例。

您应该更改create()功能中的一行：

return render(request, 'authorization/register.html', {'form': RegisterForm})

到此：

return render(request, 'authorization/register.html', {'form': form})

在POST数据中缺少Django表单输入

1 个答案: