/profile 处的 RelatedObjectDoesNotExist答案

【问题标题】：RelatedObjectDoesNotExist at /profile/profile 处的 RelatedObjectDoesNotExist
【发布时间】：2018-02-27 16:26:44
【问题描述】：

我已经创建了用户配置文件模型。我迁移了模型以与数据库同步。但是，当我路由到/profile (whose url is this url(r'^profile$', views.update_profile, name="profile"),) 时，我收到User has no profile 的错误，它应该调用update_profile 视图，在检查它是否为POST 方法之前，我已经打印了request 对象，但它也没有显示在贝壳。我哪里做错了？

这是我的代码

class Profile(models.Model):
    user = models.OneToOneField(User, on_delete=models.CASCADE)
    bio = models.TextField(max_length=600, blank=True)
    location = models.CharField(max_length=30, blank=True)
    birth_date = models.DateField(blank=True, null=True)


def create_user_profile(sender, instance, created, **kwargs):
    if created:
        Profile.objects.create(user=instance)
post_save.connect(create_user_profile, sender=User)


def save_user_profile(sender, instance, **kwargs):
    instance.profile.save()
post_save.connect(save_user_profile, sender=User)


class UserForm(forms.ModelForm):

    class Meta:
        model = User
        fields = ('first_name', 'last_name', 'email')


class ProfileForm(forms.ModelForm):

    class Meta:
        model = Profile
        exclude = ('user', )


def update_profile(request):
    print('user ################', request.user, request.user.profile)
    if request.method == 'POST':
        user_form = UserForm(request.POST, instance=request.user)
        profile_form = ProfileForm(
            request.POST or None, instance=request.user.profile)
        if user_form.is_valid() and profile_form.is_valid():
            user_form.save()
            profile_form.save()
            messages.success(
                request, ('your profile was successfully updated!'))
            return redirect('products:profile')
        else:
            messages.error(
                request, ('There was an error updating your profile'))
    else:
        user_form = UserForm(instance=request.user)
        profile_form = ProfileForm(instance=request.user.profile)
    return render(request, 'dashboard/company/profile.html', {'user_form': user_form, 'profile_form': profile_form})

【问题讨论】：

标签： python django python-3.x django-models django-forms

【解决方案1】：

抱歉，我在发布问题后才找到结果。如果我需要删除问题，我一定会删除它，否则这里是解决方案

def update_profile(request):
    try:
        profile = request.user.profile
    except Profile.DoesNotExist:
        profile = Profile(user=request.user)
    if request.method == 'POST':
        user_form = UserForm(request.POST, instance=request.user)
        profile_form = ProfileForm(
            request.POST or None, instance=profile)
        if user_form.is_valid() and profile_form.is_valid():
            user_form.save()
            profile_form.save()
            messages.success(
                request, ('your profile was successfully updated!'))
            return redirect('products:profile')
        else:
            messages.error(
                request, ('There was an error updating your profile'))
    else:
        user_form = UserForm(instance=request.user)
        profile_form = ProfileForm(instance=request.user.profile)
    return render(request, 'dashboard/company/profile.html', {'user_form': user_form, 'profile_form': profile_form})

上面代码中更新的部分是

try:
        profile = request.user.profile
    except Profile.DoesNotExist:
        profile = Profile(user=request.user)

我无法清楚地解释，但查看错误，配置文件中的 RelatedObjectDoesNotexist 给了我一个检查 request.user.profile 是否存在的想法，所以我尝试了这种方式，它对我有用。如果有人对此很了解，请随时详细解释。

【讨论】：

【解决方案2】：

你可以用更少的代码来写，比如，

def update_profile(request):
    profile = Profile.objects.get_or_create(user=request.user)
    if request.method == 'POST':
        user_form = UserForm(request.POST, instance=request.user)
        profile_form = ProfileForm(
            request.POST or None, instance=profile)
        if user_form.is_valid() and profile_form.is_valid():
            user_form.save()
            profile_form.save()
            messages.success(
                request, ('your profile was successfully updated!'))
            return redirect('products:profile')
        else:
            messages.error(
                request, ('There was an error updating your profile'))
    else:
        user_form = UserForm(instance=request.user)
        profile_form = ProfileForm(instance=profile)
    return render(request, 'dashboard/company/profile.html', {'user_form': user_form, 'profile_form': profile_form})

【讨论】：