如何验证表单在 Django CBV post 方法中是否有效？答案

【问题标题】：How to verify if a form is valid in Django CBV post method?如何验证表单在 Django CBV post 方法中是否有效？
【发布时间】：2015-04-14 18:38:45
【问题描述】：

我有一个如下所示的自定义注册表单：

class AdminSignupForm(UserCreationForm):

    def __init__(self, *args, **kwargs):
        super(AdminSignupForm, self).__init__(*args, **kwargs)
        # remove username from the form (we will autogenerate a random one)
        self.fields.pop('username')

    class Meta:
        # Set this form to use the User model.
        model = User

        # Constrain the UserForm to just these fields.
        fields = ('first_name', 'last_name', 'title', 'email')

    def save(self, commit=True):
        random = ''.join([choice(letters) for i in xrange(30)])
        self.instance.username = random
        return super(AdminSignupForm, self).save()

表单的视图是：

def post(self, request, *args, **kwargs):
    super(AdminSignupView, self).post(request, *args, **kwargs)
    # ... do some things based on the form fields (i.e create object instances, etc.)

    return reverse("home")

我想要做的是验证表单并在它无效时返回正确的 HttpResponse。问题是我需要在执行某些操作之前调用 super()，因为父类 post() 为我创建了一个 User。我想做一些事情，比如从 post super() 获取返回值并检查它以查看表单是否无效 - 我在 django 源代码中看到它返回一个render_to_response，但搜索错误看起来非常难看那里。我确信有一个更好的解决方案，只是我无法理解它......

【问题讨论】：

标签： django validation django-forms django-views django-class-based-views

【解决方案1】：

您是否考虑过使用 FormView？

from myapp.forms import AdminSignupForm
from django.core.urlresolvers import reverse
from django.views.generic.edit import FormView

class SignUpView(FormView):
    template_name = 'path/to/signup-template.html'
    form_class = AdminSignupForm
    success_url = reverse("home")

    def form_valid(self, form):
        # This method is called when valid form data has been POSTed.
        # It should return an HttpResponse.
        return super(SignUpView, self).form_valid(form)

    def form_invalid(self, form):
        # This method is called when invalid form data has been POSTed.
        return super(SignUpView, self).form_invalid(form)

https://docs.djangoproject.com/en/1.7/ref/class-based-views/generic-editing/#django.views.generic.edit.FormView

【讨论】：