让 django 信号在应用程序之间工作

Question

我有一个名为 receipt_printer 的 Django 应用程序，它应该在使用信号接收到订单时打印订单。这里有两个应用程序，名为：Orders 和 receipt_printer.

但是，无论何时处理订单并充满电，我都无法使用信号。为了简单起见，下面的示例只是将一些内容打印到控制台。如果我在 Orders 应用程序的 models.py 中执行所有操作，它就可以正常工作。

receipt_printer/apps.py

from django.apps import AppConfig

class ReceiptPrinterConfig(AppConfig):
    name = 'receipt_printer'

    def ready(self):
        from . import signals

receipt_printer/signals.py

from django.db import models
from saleor.order.models import Order
from django.db.models.signals import post_save

def order_fully_paid_signal(sender, instance, created, **kwargs):
    if instance.get_payment_status() == "fully-charged":
        print("This signal is working for fully paid order")
    else:
        print("This signal won't working for fully paid order")
post_save.connect(order_fully_paid_signal, sender=Order)

receipt_printer/init.py

default_app_config = 'receipt_printer.apps.ReceiptPrinterConfig'

更新，也尝试了以下 - 没有用：

@receiver(post_save, sender=Order)
def order_fully_paid_signal(sender, instance, created, **kwargs):
    if instance.get_payment_status() == "fully-charged":
        print("This signal is working for fully paid order")
    else:
        print("This signal won't working for fully paid order")

Answer 1

不完全确定这里的问题是什么，但下面是我使用的 post_save 模式，它可以跨应用工作，无需对 apps.py 或 init.py 进行任何更改：

from django.db.models.signals import post_save
from django.dispatch import receiver

@receiver(post_save, sender=<Model>, dispatch_uid='<model>_post_save')
def <model>_post_save(sender, instance, **kwargs):

    ...

Answer 2

我需要将以下行添加到订单应用程序 models.py 的底部：

from saleor.saleor_package.receipt_printer.signals import order_fully_paid_signal

让 django 信号在应用程序之间工作

Getting django signals to work between applications

python

django

django-signals

saleor