Django错误表单提交

Question

我有一个应用程序，可以让你创建个人资料。我的应用程序的一个功能是让你编辑你的名字并上传一张图片。

问题是，用户不能提交图像，除非他输入他的name.How，我可以修复这个页面，这样如果用户提交了图像，但没有提交姓名，就可以这样做了。他将仍然使用他的旧名字，或者如果他不提交图像并更改自己的名字。他还会留着他的老照片吗？

我尝试添加blank=True，null = False，null = True，但似乎没有效果

我的models.py

class Person(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=100,null=True,blank=False)
    image = models.FileField(upload_to="images/")

    def __unicode__(self):
        return self.name

我的forms.py

 class PersonForm(forms.ModelForm):
    class Meta:
        model = Person
        fields = ('image','name',)

我的views.py

def Display(request):
    if not request.user.is_authenticated():
        return HttpResponseRedirect(reverse('world:LoginRequest'))

    if request.method == 'POST':
        form = PersonForm(request.POST, request.FILES)
        if form.is_valid():
            person = Person.objects.get(user=request.user)
            person.image = form.cleaned_data['image']
            person.name = form.cleaned_data['name']
            person.save() 
    return render(request,'edit.html',{'form': PersonForm()})

​

​

Answer 1

class Person(models.Model):
    user = models.ForeignKey(User)
    name = models.CharField(max_length=100, blank=True)
    image = models.FileField(upload_to="images/", blank=True)

    def __unicode__(self):
        return self.name

def Display(request):
    if not request.user.is_authenticated():
        return HttpResponseRedirect(reverse('world:LoginRequest'))

    if request.method == 'POST':
        form = PersonForm(request.POST, request.FILES)
        if form.is_valid():
            image = form.cleaned_data['image']
            name = form.cleaned_data['name']

            person = Person.objects.get(user=request.user)

            if image:
                person.image = form.cleaned_data['image']
            if name:
                person.name = form.cleaned_data['name']

            person.save() 
    return render(request,'edit.html',{'form': PersonForm()})

Answer 2

django forms对用户数据进行验证

验证在两个级别上完成：

1. 字段级别：

- if the field is required and the user didn't enter any data it will raise an error
- if the user entered improperly formatted data for that field it will raise an error
- you can override the behavior of field validation by implementing functions named as `clean_fieldname` 
- this type of validation results in `form.field.errors`

​

1. the form level:

- checks for any (non-field specific) validation errors
- you can override the behavior by implementing `clean` method 
- this type of validation results in `form.non_field_errors`

​

从你的模型中：

图像不允许为空，这意味着它是必需的。不输入图像将引发错误

让名称和图像都使用blank=True

另外，我推荐使用form.save()而不是保存视图中的模型

还有一个用于保存图像的内置ImageField