（Django）基于类的视图中的验证表单不起作用答案

【问题标题】：(Django) Validation Forms in class based View doesn't work（Django）基于类的视图中的验证表单不起作用
【发布时间】：2021-05-12 12:42:49
【问题描述】：

我创建了一个视图，用户可以在其中注册使用带有验证功能的表单。但是，这些功能不起作用。

class SignUpPage(View):
    def get(self, request):
        form = SignUpForm()
        return render(request, "signup.html", {'form': form})
    def post(self, request):
        form = SignUpForm(request.POST or None)
        if form.is_valid():
            redirect('/signup')
        else:
            form = SignUpForm()
        ctx = {"form": form}
        return render(request, "signup.html", ctx)

形式：

class SignUpForm(forms.Form):
    first_name = forms.CharField(max_length=32, required=True)
    last_name = forms.CharField(max_length=32, required=True)
    username = forms.CharField(max_length=32, required=True)
    email = forms.CharField(label="email")
    password1 = forms.CharField(label="Password", max_length=32, widget=forms.PasswordInput(attrs={'class': 'password'}))
    password2 = forms.CharField(label="Password Again", max_length=32, widget=forms.PasswordInput(attrs={'class': 'password'}))
    date_of_birth = forms.DateField(label="Date of birth", required=True, widget=forms.SelectDateWidget(years=YEARS, attrs={'class': 'date-select'}))

def validate_email(self):
    data = self.cleaned_data.get('email')
    if User.objects.filter(email=data).exists():
        raise forms.ValidationError("This email is already registered")
    return data

def validate_age(self):
    user_date = str(self.cleaned_data['date_of_birth'])
    year = int(user_date[0:4])
    month = int(user_date[5:7])
    day = int(user_date[8:10])
    today = dt.today()

    if int(today.year) - year < 18:
        raise forms.ValidationError("You must be 18 years old to have an account")
    elif int(today.year) - year == 18 and int(today.month) - month < 0:
        raise forms.ValidationError("You must be 18 years old to have an account")
    elif int(today.year) - year == 18 and int(today.month) - month == 0 and int(today.day) - day < 0:
        raise forms.ValidationError("You must be 18 years old to have an account")
    else:
        return user_date

谁能解释一下为什么这些验证功能不起作用？我什至尝试过：

    def validate_email(self):
        data = self.cleaned_data.get('email')
        if data == "abc":
            raise forms.ValidationError("This email is already registered")
        return data

通过在输入字段中写入“abc”。

或：

data = self.cleaned_data['email']

更多细节的HTML代码：

   <form action="" method="post" class="formField">
                {% csrf_token %}
                {{form}}
                <div class="s-password">
                    <input type="checkbox" class="form-checkbox" id="show-password" onclick="showPassword()">
                    <label for id="s-password">Show Password</label>
                </div>
                <div class="form-btn-wrapper">
                    <button type="submit" class="btn-form">Sign Up</button>
                    <input type="checkbox" class="form-checkbox" id="check" name="remember">
                    <label for id="remember">Remember me</label>
                </div>
                <footer class="form-footer">
                    <p>Already have an account <a href="/login">Login now</a></p>
                </footer>
</form>

【问题讨论】：

标签： python django

【解决方案1】：

    else:
        form = SignUpForm()

当表单无效时，您正在再次创建表单，但没有将任何发布数据传递给它。验证器可能工作正常，但您在重新创建表单时将其屏蔽。

要解决这个问题，只需删除这两行，这里不需要它们，因为您的 GET 路径与您的视图中的 POST 路径是分开的。

【讨论】：

另外，request.POST or None 应该只是 request.POST
谢谢，但在我的情况下它不起作用。删除这些行后，添加 print(form.is_valid) got True.
您确定您的 HTML 表单使用 POST 提交数据吗？

【解决方案2】：

当表单无效时，您将表单分配给空表单

def post(self, request):
    form = SignUpForm(request.POST or None)
    if form.is_valid():
        # User creation logic ...
        return redirect('/signup') # Your success url page after user is created

    # If this code is executed it means form was not valid
    ctx = {"form": form}
    return render(request, "signup.html", ctx) # Your sign up page to display validation error messages

【讨论】：