使用 django 表单向导保存模型时出错

Question

尝试将模型保存到数据库时出现IntegrityError

def done(self, form_list, **kwargs):
    new = Business()
    new.user = self.request.user
    for form in form_list:
        for k,v in form.cleaned_data.iteritems():
            new.k = v
    new.save()
    return redirect('/')

错误说：(1048, "Column 'category_id' cannot be null")

正在填写并具有类别模型的表单：

class AddForm2(forms.Form):
    category = forms.ModelChoiceField(queryset = Category.objects.filter(children__isnull=True))
    city = forms.ModelChoiceField(queryset = City.objects.all())
    name = forms.CharField(max_length = 200, label="Business Name")
    address = forms.CharField(max_length = 200, label="Street Address")
    slogan = forms.CharField(max_length=140)
    phone = forms.CharField(max_length=10)
    website = forms.URLField()
    email = forms.EmailField()

models.py 业务

class Business(models.Model):
    TYPE_CHOICES = (
        ('1','Basic'),
        ('2','Silver'),
        ('3','Platinum'))
    user = models.OneToOneField(User)
    ad_type = models.CharField(choices = TYPE_CHOICES, default = '1', max_length=1)
    name = models.CharField(max_length=200)
    slug = models.SlugField()
    address = models.CharField(max_length=200)
    slogan = models.CharField(max_length=140, blank=True)
    description = models.TextField()
    phone = models.CharField(max_length=10)
    website = models.URLField(blank=True)
    email = models.EmailField()
    twitter = models.CharField(max_length=100, blank=True)
    facebook = models.URLField(blank=True)
    category = models.ForeignKey(Category)
    city = models.ForeignKey(City)

---

编辑：

我在完成方法中更改了setattr(new,k,v)的行new.k = v，它起作用了。不知道有什么区别...

Answer 1

done（） 函数应该改用 setattr：

def done(self, form_list, **kwargs):
    new = Business()
    new.user = self.request.user
    for form in form_list:
        for k,v in form.cleaned_data.iteritems():
            setattr(new, k, v)
    new.save()
    return redirect('/')

Answer 2

深入研究django.forms.models后，我建议使用方便的construct_instance方法将数据从多个表单保存到单个实例：

from django.contrib.formtools.wizard.views import SessionWizardView
from django.forms.models import construct_instance

class YourFormWizard(SessionWizardView):
    def done(self, form_list, **kwargs):
        new = Business()
        new.user = self.request.user
        for form in form_list:
            new = construct_instance(form, new, form._meta.fields, form._meta.exclude)
        new.save()
        return redirect('/')