Sith/core/signals.py

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from django.core.cache import cache
from django.db.models.signals import m2m_changed
from django.dispatch import receiver
from core.models import User
@receiver(m2m_changed, sender=User.groups.through, dispatch_uid="user_groups_changed")
def user_groups_changed(sender, instance: User, **kwargs):
"""
Clear the cached clubs of the user
"""
# As a m2m relationship doesn't live within the model
# but rather on an intermediary table, there is no
# model method to override, meaning we must use
# a signal to invalidate the cache when a user is removed from a club
cache.delete(f"user_{instance.id}_groups")