发送者AUTH_USER_MODEL的post_save信号在登录时触发

Question

做了什么

我有一个名为User的自定义MyUser模型，正如文档中的full example for an custom user model所述，以及UserProfile所谓的MyUser在Django文档中描述的关于如何One-to-one relationship的extend an existing user model之类的内容。

Customizing authentication的文档是how to connect a post_save signal with the existing User model的示例。

通过这样做，我将一个测试接收器放在一个由我的apps.py文件加载的signals.py中，就像它在this SO回答中描述的那样。

配置

signal.py

def post_save_receiver(sender, instance, created, **kwargs):
    send_mail('Testing', "Just testing...", 'hell@earth.tld', ['admin@heaven.tld'], fail_silently=False)

post_save.connect(post_save_receiver, sender=settings.AUTH_USER_MODEL)

models.py

class MyUserManager(BaseUserManager):
    def create_user(self, email, password=None):
    """
        Creates and saves a User with the given email and password.
        """
        if not email:
            raise ValueError('Users must have an email address')

        user = self.model(
            email=self.normalize_email(email),
        )

        user.set_password(password)
        user.save(using=self._db)
        return user

    def create_superuser(self, email, password):
        """
        Creates and saves a superuser with the given email and password.
        """
        user = self.create_user(email,
            password=password,
        )
        user.is_admin = True
        user.save(using=self._db)
        return user




class MyUser(AbstractBaseUser):
    email = models.EmailField(
        verbose_name='email address',
        max_length=255,
        unique=True,
    )
    is_active = models.BooleanField(default=True)
    is_admin = models.BooleanField(default=False)

    objects = MyUserManager()

    USERNAME_FIELD = 'email'

    def get_full_name(self):
        # The user is identified by their email address
        return self.email

    def get_short_name(self):
        # The user is identified by their email address
        return self.email

    def __str__(self):              # __unicode__ on Python 2
        return self.email

    def has_perm(self, perm, obj=None):
        "Does the user have a specific permission?"
        # Simplest possible answer: Yes, always
        return True

    def has_module_perms(self, app_label):
        "Does the user have permissions to view the app `app_label`?"
        # Simplest possible answer: Yes, always
        return True

    @property
    def is_staff(self):
        "Is the user a member of staff?"
        # Simplest possible answer: All admins are staff
        return self.is_admin

views.py

def UserLogin(request):
    if request.user.is_authenticated():
        return HttpResponseRedirect("http://www.heaven.tld/account")
    else:
        if request.method == 'POST':
            form = UserLoginForm(request.POST)
            if form.is_valid():
                username = form.cleaned_data['username']
                password = form.cleaned_data['password']
                user = authenticate(username=username, password=password)
                if user is not None and user.is_active:
                    login(request, user)
                    return HttpResponseRedirect("http://www.heaven.tld/account")
                else:
                    error_msg = 'Please try again!'
                    return render(request, "development",
                        {'form':form,
                        'error_msg':error_msg,
                         })
            else:
                error_msg = "Please try again!"
                return render(request, "development",
                    {'form':form,
                    'error_msg':error_msg,
                    })
        else:
            form = UserLoginForm()
            return render(request, "development", {'form': form})

问题

现在，如果我登录，我总是收到这封邮件，但我只想在创建用户时才想要它。

Answer 1

登录会导致更新last_login时间戳，从而触发保存。

正如其他人所说，你只需要使用created参数，你的信号会收到这个参数，但你现在忽略了。

Answer 2

尝试：

def post_save_receiver(sender, instance, created, **kwargs):
    if created:
        send_mail('Testing', "Just testing...", 'hell@earth.tld',     ['admin@heaven.tld'], fail_silently=False)


post_save.connect(post_save_receiver, sender=settings.AUTH_USER_MODEL)

Answer 3

我无法理解您登录时会保存的内容。您可以使用ipdb来跟踪它。顺便说一句，如果你在send_mail函数之前设置了创建的条件，那么问题就应该解决了。

angular.module('myApp')
  .directive('myDirective', myDirective);

function myDirective() {
  return function(scope, iElement) {
    function onClick() {
      alert('clicked!');
    }
    iElement.on('click', onClick);
    scope.$on('$destroy', function() {
      iElement.off('click', onClick);
    });
  }
}