如何使用 django post_save 信号

Question

我有两个模型，客户端和具有外键关系的联系人模型，我在创建客户端时使用 Django 信号创建联系人，但我从数据库中收到错误:( 1048，"Column 'client_id' cannot be null" ) 当我检查数据库时，我找到了联系人和客户行，那么如何摆脱这个错误？

models.py

class Client_Data(models.Model):
     RC = models.CharField(max_length=50)
     Raison_social = models.CharField(max_length=254)
     NIF = models.CharField(max_length=50,unique=True)
     AI = models.CharField(max_length=50,unique=True)
     NIS = models.CharField(max_length=50,unique=True)
     Banque = models.CharField(max_length=50,unique=True)
     CB = models.CharField(max_length=50)
     adresse = models.CharField(max_length=50)
     slug = models.SlugField(blank=True, unique=True)
     active = models.BooleanField(default=True)
class Contact(models.Model):
     client = models.ForeignKey(Client_Data,blank=True,on_delete=models.CASCADE)
     Nom = models.CharField(max_length=50)
     post = models.CharField(max_length=50)
     Tel = models.CharField(max_length=50)
     email = models.EmailField(max_length=255,unique=True)
     contact_type = models.CharField(default='Client_contact',max_length=50)




@receiver(post_save, sender=Client_Data)
def create_contact(sender, **kwargs):
          if kwargs['created']:
               conatact = Contact.objects.create(client=kwargs['instance'])

post_save.connect(create_contact, sender=Client_Data)

views.py

def save_client_form(request, form,Contact_form, template_name):
    data = dict()
    if request.method == 'POST':
        if form.is_valid() and Contact_form.is_valid():
            form.save()
            Contact_form.save()

            data['form_is_valid'] = True
            books = Client_Data.objects.all()
            data['html_book_list'] = render_to_string('Client_Section/partial_client_c.html', {
                'client': books
            })
        else:
            print(form.errors)
            print(Contact_form.errors)
            data['form_is_valid'] = False
    context = {'form': form,'contact_form':Contact_form}
    data['html_form'] = render_to_string(template_name, context, request=request)
    return JsonResponse(data)




def client_create(request):
    if request.method == 'POST':
        form = ClientForm(request.POST)
        contact_form = Contact_Form(request.POST)
    else:
        form = ClientForm()
        contact_form = Contact_Form()
    return save_client_form(request, form,contact_form, 'Client_Section/partial_client.html')

forms.py


class ClientForm(forms.ModelForm):
    class Meta:
        model = Client_Data
        fields = ('id', 'RC','Raison_social','NIF','AI','NIS','CB','Banque', 'adresse', 'active' ,)






class Contact_Form(forms.ModelForm):
    class Meta:
        model = Contact
        fields = ('Nom','post','Tel','email','contact_type',)

Answer 1

我觉得问题出在这里

Contact_form.save()

Contact_form 将在没有 client_id 的情况下保存到数据库。它与您的 post 保存无关。

如果您想在 Contact_form 中为您的 Contact 设置客户端，请尝试以下操作：

client = form.save()
contact = Contact_form.save(commit=False)
contact.client = client
contact.save()

Answer 2

我认为你不需要使用这个，这里你已经在使用装饰器了。

post_save.connect(create_contact, sender=Client_Data)


def create_contact(sender, **kwargs):

这里尝试添加

def create_contact(sender, instance, created, *artgs, **kwargs):

如何使用 django post_save 信号

how to use django post_save signal

django

django-3.0