在Django中，如何防止AppConfig.ready（）中的信号导入多次运行？

Question

To keep signals organised:

__init__.py

default_app_config = 'posts.apps.PostsConfig'

apps.py

from django.apps import AppConfig


class PostsConfig(AppConfig):
    name = 'posts'

    def ready(self):
        import posts.signals

How do I ensure that ready() or import posts.signals only runs once?

Answer 1

from django.apps import AppConfig


class PostsConfig(AppConfig):
    name = 'posts'
    ready_has_run = False

    def ready(self):
        if self.ready_has_run:
            return
        import posts.signals
        self.ready_has_run = True