first commit

portfolio/signals.py

@@ -0,0 +1,38 @@
+from django.core.cache import cache
+from django.db.models.signals import post_save, post_delete, m2m_changed
+from django.dispatch import receiver
+
+from portfolio.models import Category, Portfolio
+
+CATEGORY_LIST_CACHE_KEY = 'portfolio:category_list'
+PORTFOLIO_LIST_CACHE_KEY = 'portfolio:portfolio_list'
+
+
+def clear_category_cache(slug=None):
+    cache.delete(CATEGORY_LIST_CACHE_KEY)
+    if slug:
+        cache.delete(f"portfolio:category_detail:{slug}")
+
+
+def clear_portfolio_cache(pk=None):
+    cache.delete(PORTFOLIO_LIST_CACHE_KEY)
+    if pk:
+        cache.delete(f"portfolio:portfolio_detail:{pk}")
+
+
+@receiver(post_save, sender=Category)
+@receiver(post_delete, sender=Category)
+def clear_category_cache_on_change(sender, instance, **kwargs):
+    clear_category_cache(slug=instance.slug)
+
+
+@receiver(post_save, sender=Portfolio)
+@receiver(post_delete, sender=Portfolio)
+def clear_portfolio_cache_on_change(sender, instance, **kwargs):
+    clear_portfolio_cache(pk=instance.pk)
+
+
+@receiver(m2m_changed, sender=Portfolio.categories.through)
+def clear_portfolio_cache_on_category_change(sender, instance, action, **kwargs):
+    if action in {"post_add", "post_remove", "post_clear"}:
+        clear_portfolio_cache(pk=instance.pk)