在 Django 中创建新帖子时自动发送电子邮件

Question

When I save my post, I want to send email for user automatically. But it's not working. This is my code

signals.py

from django.db.models.signals import post_save
from django.dispatch import receiver
from mysite.models import Post, Email
from django.core.mail import send_mail
from blog.settings import EMAIL_HOST_USER

@receiver(post_save, sender=Post)
def SendEmail(sender , instance, created, **kwargs):
    if created:
        emails = list(Email.objects.values('email'))
        recepients = []
        for i in range(0, len(emails)):
            recepients.append(emails[i]['email'])
            pass
        send_mail('New post on blog', str(instance.title), EMAIL_HOST_USER, recepients, fail_silently=False)
        pass

Answer 1

If the signal itself 's not working, is because of this:
By default signals.py doesn't get automatically loaded into your app, so you have to manually import it.
Assuming your app is named post , you need to modify your app's config file ( post/apps.py ) accordingly.

This is an example how:

# post/apps.py #
from django.apps import AppConfig

class PostConfig(AppConfig):
    name = 'post'    
    def ready(self):
        print(">DEBUG::loading_signals")
        import post.signals
        # other stuff you need imported on app's startup

If you're still not receiving signals, try specifying your app's default config class inside your app's __init__.py file, like so:

# post/__init__.py #
default_app_config = "post.apps.PostConfig"

from Django docs itself:

Where should this code [signals] live?

Strictly speaking, signal handling and registration code can live anywhere you like, although it's recommended to avoid the application's root module and its models module to minimize side-effects of importing code.

In practice, signal handlers are usually defined in a signals submodule of the application they relate to. Signal receivers are connected in the ready() method of your application configuration class. If you're using the receiver() decorator, import the signals submodule inside ready() .

References:
https://docs.djangoproject.com/en/3.0/ref/applications/#django.apps.AppConfig.ready
https://docs.djangoproject.com/en/3.0/topics/signals/#connecting-receiver-functions