python之Django:ModelForms:ImageField 始终为空并被 ModelForm 拒绝

我基于几个 ModelForm 元素创建了一个表单。除了 图像字段。由于缺少 ImageField form.is_valid() 总是返回 False - 即使我将 request.FILES 传递给表单。

为什么带有 ImageField 的表单总是无效/为空？

表格

class UserProfileForm2(forms.ModelForm): 
 
    class Meta: 
        model = models.UserProfile 
        fields = ['description', 'picture'] 
 
class LocationForm(forms.ModelForm): 
    class Meta: 
        model = models.Location 
        fields = ['city', 'state', 'country'] 
 
class UserForm(forms.ModelForm): 
    class Meta: 
        model = registration_models.User 
        fields = ['first_name', 'last_name'] 

模型

class Location(models.Model): 
 
    city = models.CharField(max_length=100) 
    state = models.CharField(max_length=100) 
    country = models.CharField(max_length=100) 
 
    def __unicode__(self): 
        return ' - '.join([self.city, self.state, self.country]) 
 
 
class UserProfile(models.Model): 
 
    authenticationuser = fields.AutoOneToOneField(AuthUser) 
    description = models.TextField() 
    picture = models.ImageField(upload_to='uploaded_files/', null=True) 
    location = models.ForeignKey(Location, null=True) 
    appear_in_public_ranking = models.BooleanField(default=True) 
 
    def __unicode__(self): 
        return self.authenticationuser.username 

查看

@login_required 
def changeprofile(request): 
    form = None 
 
    # user posted his new profile settings 
    if request.method == 'POST': 
        user_form = myforms.UserForm(request.POST) 
        user_profile_form = myforms.UserProfileForm2(request.POST, request.FILES) 
        location_form = myforms.LocationForm(request.POST) 
 
        forms_are_invalid = not (user_form.is_valid() and user_profile_form.is_valid() and not location_form.is_valid()) 
 
        if forms_are_invalid: 
            forms = {'user_form':user_form, 
                 'user_profile_form':user_profile_form, 
                 'location_form':location_form} 
            return shortcuts.render(request, 'changeprofile.html', forms) 
 
        location_form.save() 
        user_form.save() 
        user_profile_form.save() 
 
        return HttpResponseRedirect('/profile') 
 
    else: 
        forms = {'user_form':user_form, 
            'user_profile_form':user_profile_form, 
             'location_form':location_form} 
        return shortcuts.render(request, 'changeprofile.html', forms) 

模板

        <form action="{% url 'changeprofile' %}" method="post"> 
        {% csrf_token %} 
            {{ user_form }} 
            {{ location_form }} 
            {{ user_profile_form }} 
            <input type="submit" value="Submit" /> 
        </form> 

请您参考如下方法:

如果您的表单包含文件输入，那么您必须在表单中将 enctype 设置为:

<form action="{% url 'changeprofile' %}" method="post" enctype="multipart/form-data"> 

否则 request.FILES 将永远为空。