zulip/zerver/apps.py

import logging
from typing import Any, Dict

from django.apps import AppConfig
from django.conf import settings
from django.core.cache import cache
from django.db.models.signals import post_migrate

def flush_cache(sender: AppConfig, **kwargs: Any) -> None:
    logging.info("Clearing memcached cache after migrations")
    cache.clear()


class ZerverConfig(AppConfig):
    name = "zerver"  # type: str

    def ready(self) -> None:
        import zerver.signals

        if settings.POST_MIGRATION_CACHE_FLUSHING:
            post_migrate.connect(flush_cache, sender=self)