import signal module to AppConfig

[namwooo]

Django-2-by-Example/Chapter06/bookmarks/images/apps.py

The signal module has to be imported in AppConfig.__init__() method, not AppConfig.ready() method. Otherwise, the m2m_changed signal is not triggered.

Here is Django official documentation,
https://docs.djangoproject.com/en/2.0/ref/signals/#class-prepared

[praju89]

Thank you namwoo-andreea for the information. We will update the same on our website.