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[英]How to know level of every child relative to main parent in django-mptt?
[英]How to fix no of child to parent in django-mptt?
我想为每个父母修复 2 个孩子。
模型.py
class CoachingRegistration(MPTTModel):
uid = models.UUIDField(unique=True, editable=False, default=uuid.uuid4)
placement_id = models.CharField(max_length=13)
parent = TreeForeignKey('self', on_delete=models.CASCADE, null=True, blank=True, related_name='children')
class MPTTMeta:
order_insertion_by = ['placement_id']
def __str__(self):
return str(self.placement_id)
请帮我解决这个问题。
您可以使用表单 form_valid function 在 createview 中修复此问题
class CoachingRegistrationCreate(LoginRequiredMixin, SuccessMessageMixin, CreateView):
model = CoachingRegistration
form_class = CoachingRegistrationForm
template_name = 'customer/form_coaching_register.html'
def form_valid(self, form):
if 2 > CoachingRegistration.objects.filter(parent=CoachingRegistration.objects.get(coaching_id=form.instance.placement_id)).count():
return super().form_valid(form)
else:
return super().form_invalid(form)
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