update

apps/api/v1/signals.py

@@ -0,0 +1,102 @@
+"""
+Django signals for automatically updating statistics cache.
+
+This module contains signal handlers that invalidate the stats cache
+whenever relevant entities are created, updated, or deleted.
+"""
+
+from django.db.models.signals import post_save, post_delete
+from django.dispatch import receiver
+from django.core.cache import cache
+
+from apps.parks.models import Park, ParkReview, ParkPhoto, Company as ParkCompany
+from apps.rides.models import (
+    Ride,
+    RollerCoasterStats,
+    RideReview,
+    RidePhoto,
+    Company as RideCompany,
+)
+
+
+def invalidate_stats_cache():
+    """
+    Invalidate the platform stats cache.
+
+    This function is called whenever any entity that affects statistics
+    is created, updated, or deleted.
+    """
+    cache.delete("platform_stats")
+    # Also update the timestamp for when stats were last invalidated
+    from datetime import datetime
+
+    cache.set("platform_stats_timestamp", datetime.now().isoformat(), 300)
+
+
+# Park signals
+@receiver(post_save, sender=Park)
+@receiver(post_delete, sender=Park)
+def park_changed(sender, **kwargs):
+    """Handle Park creation/deletion."""
+    invalidate_stats_cache()
+
+
+# Ride signals
+@receiver(post_save, sender=Ride)
+@receiver(post_delete, sender=Ride)
+def ride_changed(sender, **kwargs):
+    """Handle Ride creation/deletion."""
+    invalidate_stats_cache()
+
+
+# Roller coaster stats signals
+@receiver(post_save, sender=RollerCoasterStats)
+@receiver(post_delete, sender=RollerCoasterStats)
+def roller_coaster_stats_changed(sender, **kwargs):
+    """Handle RollerCoasterStats creation/deletion."""
+    invalidate_stats_cache()
+
+
+# Company signals (both park and ride companies)
+@receiver(post_save, sender=ParkCompany)
+@receiver(post_delete, sender=ParkCompany)
+def park_company_changed(sender, **kwargs):
+    """Handle ParkCompany creation/deletion."""
+    invalidate_stats_cache()
+
+
+@receiver(post_save, sender=RideCompany)
+@receiver(post_delete, sender=RideCompany)
+def ride_company_changed(sender, **kwargs):
+    """Handle RideCompany creation/deletion."""
+    invalidate_stats_cache()
+
+
+# Photo signals
+@receiver(post_save, sender=ParkPhoto)
+@receiver(post_delete, sender=ParkPhoto)
+def park_photo_changed(sender, **kwargs):
+    """Handle ParkPhoto creation/deletion."""
+    invalidate_stats_cache()
+
+
+@receiver(post_save, sender=RidePhoto)
+@receiver(post_delete, sender=RidePhoto)
+def ride_photo_changed(sender, **kwargs):
+    """Handle RidePhoto creation/deletion."""
+    invalidate_stats_cache()
+
+
+# Review signals
+@receiver(post_save, sender=ParkReview)
+@receiver(post_delete, sender=ParkReview)
+def park_review_changed(sender, **kwargs):
+    """Handle ParkReview creation/deletion."""
+    invalidate_stats_cache()
+
+
+@receiver(post_save, sender=RideReview)
+@receiver(post_delete, sender=RideReview)
+def ride_review_changed(sender, **kwargs):
+    """Handle RideReview creation/deletion."""
+    invalidate_stats_cache()