Django的OneToOneField不会引用另一个表的ID字段吗？

debugcn 发表于 Dev

山禅

我认为models.OneToOneField，在这种情况下，组字段是指Group表的ID字段。但是，通过我views.py，如果我在Group's时不上传图片，则该Group会发生id == 6Group_Cover的group_id == 3情况id == 2, 3 and 4。

抱歉，我的英语很奇怪。简而言之，Django当群组的ID为6时，我以为在Group_Cover的group_id中设置了6。

models.py

@python_2_unicode_compatible
class Group(models.Model):

    #group_id = models.AutoField(primary_key=True)
    group_name = models.CharField(max_length=50, unique=False, blank=False)

    class Meta:
        db_table = traceback.extract_stack()[-2][2].lower()


@python_2_unicode_compatible
class Group_Cover(models.Model):

    group = models.OneToOneField(Group, primary_key=True)
    group_cover = models.ImageField(upload_to="static/image/group/")

    class Meta:
        db_table = traceback.extract_stack()[-2][2].lower()

views.py

@login_required(login_url='/')
def group_register(request):

    import pdb; pdb.set_trace()
    from myapp.forms import GroupRegister
    from myapp.forms import GroupCover
    formset = GroupRegister
    formcover = GroupCover

    if request.method == 'POST':
        form = formset(request.POST)
        cover = formcover(request.POST)

        if form.is_valid():
            from myapp.models import Group
            new_group = Group()
            new_group.group_name = form.cleaned_data['group_name']
            new_group.save()

            from myapp.models import Group_Cover
            new_cover = Group_Cover()
            new_cover.group_cover = request.FILES['group_cover']
            new_cover.save()

            return redirect('/myapp/group_page/{}'.format(new_group.id))

    else:
        form = formset()
        cover = formcover()

    view = { 
        'form': form,
        'cover': cover,
    }
    template = 'myapp/group/group_register.html'
    return render(request, template, view)

弗拉迪·帕拉多·克鲁兹（Vladir Parrado Cruz）

您需要将Group实例分配给该实例Group_Cover。或多或少是这样的：

   if form.is_valid():
        from myapp.models import Group
        new_group = Group()
        new_group.group_name = form.cleaned_data['group_name']
        new_group.save()

        from myapp.models import Group_Cover
        new_cover = Group_Cover()
        new_cover.group_cover = request.FILES['group_cover']

        new_cover.group = new_group # This line assigns it

        new_cover.save()

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