Question

我试图通过降低所有用户的昵称来清理数据。这是代码：

class UserProfile(models.Model):
    # This line is required. Links UserProfile to a User model instance.
    user = models.OneToOneField(User)

    # The additional attributes we wish to include.
    website = models.URLField(blank=True)

    def __unicode__(self):
        return self.user.username

    def clean(self):
        self.user.username = self.user.username.lower()

但是我得到`UserProfile没有用户。

我是Django的菜鸟，但是我是否理解，每当我们保存我们的模型时 - 使用我写过的clean（）？那是对的吗？那我的错误在哪里？

编辑：

def register(request):
    # Like before, get the request's context.
    context = RequestContext(request)

    # A boolean value for telling the template whether the registration was successful.
    # Set to False initially. Code changes value to True when registration succeeds.
    registered = False

    # If it's a HTTP POST, we're interested in processing form data.
    if request.method == 'POST':
        # Attempt to grab information from the raw form information.
        # Note that we make use of both UserForm and UserProfileForm.
        user_form = UserForm(data=request.POST)
        profile_form = UserProfileForm(data=request.POST)

        # If the two forms are valid...
        if user_form.is_valid() and profile_form.is_valid():
            # Save the user's form data to the database.
            user = user_form.save()


            # Now we hash the password with the set_password method.
            # Once hashed, we can update the user object.
            user.set_password(user.password)
            user.save()

            # Now sort out the UserProfile instance.
            # Since we need to set the user attribute ourselves, we set commit=False.
            # This delays saving the model until we're ready to avoid integrity problems.
            profile = profile_form.save(commit=False)
            profile.user = user

            # Now we save the UserProfile model instance.
            profile.save()

            # Update our variable to tell the template registration was successful.
            registered = True

        # Invalid form or forms - mistakes or something else?
        # Print problems to the terminal.
        # They'll also be shown to the user.
        else:
            print user_form.errors, profile_form.errors

    # Not a HTTP POST, so we render our form using two ModelForm instances.
    # These forms will be blank, ready for user input.
    else:
        user_form = UserForm()
        profile_form = UserProfileForm()

    # Render the template depending on the context.
    return render_to_response(
            'registration.html',
            {'user_form': user_form, 'profile_form': profile_form, 'registered': registered},
            context)

Answer 1

模型清理方法不是由保存过程调用的，而是在调用is_valid（）时通过表单调用。你可以通过查看追溯来看到它 - 它总是有用的信息。

当时调用is_valid，当然，配置文件没有用户，因此出错。

我必须说，无论如何，这一点都没有任何意义。为什么要将该代码放在Profile模型中，而不是用户模型？更好的是，它应该在用户表单中，在clean_username方法中，它应返回较低的值。

尝试清理数据时，UserProfile没有用户

1 个答案: