Question

我的Django应用程序中有一个用户注册表，它在用户尝试注册时收集其他数据，例如地址，城市，国家，电话号码等。

此数据通过post_save信号保存在帐户模型类中。用户创建过程如下：

# Function to Create user Account/Profile
def create_user_account(sender, instance, created, **kwargs):
    if created:
      models.Account.objects.create(user=instance)

# Create User / User Registration
def UserRegistration(request):
    if request.method == 'POST':
        username = request.POST['fn'].capitalize() + ' ' + request.POST['ln'].capitalize()
        # CREATE USER
        newuser = User.objects.create_user(username=username, email=request.POST['email'], password=request.POST['pw'])
        newuser.first_name = request.POST['fn'].capitalize()
        newuser.last_name = request.POST['ln'].capitalize()
        newuser.save()
    return HttpResponse(username)

#Post Save handler to create user Account/Profile
post_save.connect(create_user_account, sender=User)

当用户发布表单时调用UserRegistration函数，在此函数下，我可以获取POST数据，我想要的是将该数据传递给create_user_account方法，以便它填充在Account模型的字段中。

现在，我确实看到在数据库中创建了Account个对象，但除用户字段之外的所有字段都是空的。显然，因为POST变量没有传递给create_user_account方法。

Answer 1

我所做的是为实例设置一些'_attrs'，然后在信号处理程序中使用它们。

我想你的情况可能是：

# Function to Create user Account/Profile
def create_user_account(sender, instance, created, **kwargs):
    if created:
        attrs_needed = ['_language', '_field', '_otherfield']
        if all(hasattr(instance, attr) for attr in attr_needed):
            models.Account.objects.create(
                user=instance, 
                language=instance._language, 
                field=instance._field,
                otherfield=instance._otherfield)

# Create User / User Registration
def UserRegistration(request):
  if request.method == 'POST':
    username = request.POST['fn'].capitalize() + ' ' + request.POST['ln'].capitalize()
    # CREATE USER
    newuser = User.objects.create_user(
        username=username, email=request.POST['email'],
        password=request.POST['pw'])
    newuser.first_name = request.POST['fn'].capitalize()
    newuser.last_name = request.POST['ln'].capitalize()

    # Set some extra attrs to the instance to be used in the handler.
    newuser._language = request.POST['language']
    newuser._field = request.POST['field']
    newuser._otherfield = request.POST['otherfield']
    newuser.save()


  return HttpResponse(username)

#Post Save handler to create user Account/Profile
post_save.connect(create_user_account, sender=User)

我讨厌这样做，我想它可能会以可怕的方式破解，有时难以调试，也没有严格的方法来强制处理程序所需的数据，可以定义{{1}定义特定实例的信号处理程序所需的数据。

我没有尝试的一个不错的选择是使用实例的方法作为信号的处理程序，也许我们可以使用更结构化的方式来传递数据。

再见。

Answer 2

User.objects.create_user和User.objects.create都会立即触发post_save处理程序，因为save UserManager中会调用create_user。所以我无法想象Jorge的答案是如何起作用的（至少如果你想要只触发一次保存 - 为什么你会触发它两次？）。你想要做的是研究create_user做了什么，剖析它，这样你可以真正控制save被调用的时间：

# Function to Create user Account/Profile
def create_user_account(sender, instance, created, **kwargs):
    if created:
        attrs_needed = ['_language', '_field', '_otherfield']
        if all(hasattr(instance, attr) for attr in attr_needed):
            models.Account.objects.create(
                user=instance, 
                language=instance._language, 
                field=instance._field,
                otherfield=instance._otherfield)

# Create User / User Registration
def UserRegistration(request):
  if request.method == 'POST':
    username = request.POST['fn'].capitalize() + ' ' + request.POST['ln'].capitalize()
    # CREATE USER
    newuser = User(
        username=username,
        email=request.POST['email'],
        first_name=request.POST['fn'].capitalize()
        last_name = request.POST['ln'].capitalize()
    )
    newuser.set_password(request.POST['pw'])

    # Set some extra attrs to the instance to be used in the handler.
    newuser._language = request.POST['language']
    newuser._field = request.POST['field']
    newuser._otherfield = request.POST['otherfield']
    newuser.save()  # Now this will be really the first save which is called

  return HttpResponse(username)

#Post Save handler to create user Account/Profile
post_save.connect(create_user_account, sender=User, weak=False)

请注意，当我挂钩处理程序时，我也使用weak=False。

将其他参数传递给post_save信号

2 个答案: