如何在 Django ModelForms 中加载实例 [英] How to load an instance in Django ModelForms

问题描述

我正在使用 Django 的用户模型.

I am using Django's user model.

如何让 Django ModelForm 预填充模板中的值?我知道我必须使用该表单的实例，但我在下面哪里出错了:

How do I get a Django ModelForm to prepopulate values in a template? I know I have to use the instance for that form, but where am I going wrong below:

models.py:

class Site(models.Model):
   user = models.ForeignKey(User, )
   site_name = models.CharField(max_length=128, blank=False, null=False)

forms.py:

class SiteForm(forms.ModelForm):
      class Meta:
            model = Site
            fields = '__all__'

views.py:

def settings(request):

    site_profile = Site.objects.get(user=request.user)

    if request.method == "POST":
        form = SiteForm( instance=site_profile )
            if form.is_valid():
                form.save()

                return redirect('dashboard_home')

        else:
            form = SiteForm()

        return render(request, "dashboard/settings.html", {'form': form })

此代码返回没有错误的页面，但不会使用数据库中的值预填充表单字段.

This code returns the page with no errors, however does not prepopulate the form fields with values from the database.

我只能假设 instance 没有正确加载?

I can only assume the instance is not loading correctly?

推荐答案

def settings(request):
    if request.method == "POST":
        form = SiteForm(request.POST, instance=request.user.site_profile)
        if form.is_valid():
            form.save()
            return redirect('dashboard_home')
    site_profile = Site.objects.get(user=request.user)
    form = SiteForm(instance=site_profile)
    return render(request, "dashboard/settings.html", {'form': form })

您的缩进已关闭，您从未将 site_profile 传递给表单以填充它.如果出现 POST 请求，您不想将旧版本的 site_profile 传递给表单.我假设您想要用户在模板中填写的新值.

Your indentation was off and you never passed the site_profile to the form to have it populated. In the event of a POST request you don't want to pass the old version of site_profile to the form. I assume you want the new values the user has filled out in the template.

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