问：

现在我有一个 model.form，只有一个字段，仅此而已，但该模型有 3 个字段（请参阅下面的参考），其中 1 个由表单设置，其中一个默认为 false，因为它应该是，最后一个我将设置在视图中，但它无法正确执行，并且不知道为什么。

模型和形式。

class TeamMembership(models.Model):
    user = models.ForeignKey(User)
    team = models.ForeignKey(Team)
    leader = models.BooleanField(default=False)

class TeamSettings_acceptForm(forms.ModelForm):
    class Meta:
        model = TeamMembership
        fields = ('user',)

视图

@login_required
def teamsettings_accept_applications(request, team_pk):
    if request.method == 'POST':
        logged_in_user = get_object_or_404(User, pk=request.user.pk)
        requested_team = get_object_or_404(Team, pk=team_pk)
        for member in requested_team.teammembership_set.all().order_by('-leader'):
            if member.user.pk == request.user.pk and member.leader:
                formaccept = TeamSettings_acceptForm(request.POST)
                accepteduserid = formaccept.data['user']
                teamapplications = TeamApplication.objects.all().filter(from_user=accepteduserid).count()
                if teamapplications > 1:
                    messages.success(request, "Error")
                    return redirect('teamsettings_applications', team_pk=team_pk)
                else:
                    if formaccept.is_valid():
                        teamapplications = TeamApplication.objects.all().filter(from_user=accepteduserid)
                        teamapplications.update(accepted=True)
                        formaccept.team = requested_team.pk
                        formaccept.save()
                        messages.success(request, "User has now been added to your team!")
                        return redirect('teamsettings_applications', team_pk=team_pk)

它应该使用该数据创建一个新行并更新其他行。

我从 Django 得到的回报是

staff_teammembership.team_id may not be NULL