Question

我有一个用于创建和编辑模型实例的表单。但是在编辑模型实例时，表单仍会尝试创建新记录并失败，因为已存在唯一的一起字段。我在初始化表单时已经传递了实例。

views.py

def organization_course_detail(request, org_id):
    '''
    Get all courses that are associated with an organization
    '''
    template_name = 'users/organization-course-list.html'
    organization = models.Organization.objects.get(id=org_id)

    if request.method == 'POST':
        print organization.id
        form = forms.CreateOrganizationForm(request.POST, instance=organization)
        if form.is_valid():
            print 'form is valid'
            org = form.save(commit=False)
            org.save()
            return HttpResponseRedirect(
                reverse('users:org-course-list',
                        kwargs={'org_id': org_id}))
    else:
        form = forms.CreateOrganizationForm(instance=organization)

forms.py

class CreateOrganizationForm(forms.ModelForm):
    '''
    A form used to create a new organization. At the same time,
    we create a new course that is a clone of "Chalk Talk SAT"
    and associate the course with the organization and any student
    that signs up from that organization
    '''

    class Meta:
        model = models.Organization
        fields = ['name', 'country', 'acronym',]

models.py

class Organization(models.Model):
    '''
    This is a model where we will have every institution
    (test prep centers, governments, schools) that we do workshops
    at or create school accounts for
    '''
    name = models.CharField(max_length=2000)
    country = CountryField(null=True, blank='(Select Country)')
    date = models.DateTimeField(default=timezone.now)
    acronym = models.CharField(max_length=7, help_text="(Up to 7 characters)")
    expiration_date = models.DateTimeField(default=timezone.now)

    def get_org_admins(self):
        return self.admin_for_organizations.all()

    class Meta:
        unique_together = (
            ('name', 'country')
        )
    def __str__(self):
        return self.name

Answer 1

您是否查看过db表中的条目？（或者你可以发布它们吗？）

您可以尝试使用django shell并尝试手动执行代码（使用org_id查询数据库并检查结果。编辑一个字段并保存它。这有用吗？）

此外，我认为blank在这里只能是正确或错误。

country = CountryField(null=True, blank='(Select Country)')

https://docs.djangoproject.com/en/1.11/ref/models/fields/#django.db.models.Field.blank

即使实例传递，Django也不会更新现有记录

1 个答案: