feat: Add blog, media, and support apps, implement ride credits and image API, and remove toplist feature.

backend/apps/reviews/signals.py

@@ -0,0 +1,30 @@
+from django.db.models.signals import post_save, post_delete
+from django.dispatch import receiver
+from django.db.models import Avg
+from .models import Review
+
+@receiver(post_save, sender=Review)
+@receiver(post_delete, sender=Review)
+def update_average_rating(sender, instance, **kwargs):
+    """
+    Update the average rating of the content object when a review is saved or deleted.
+    """
+    content_object = instance.content_object
+    if not content_object:
+        # If content object doesn't exist (orphaned review?), skip
+        return
+
+    # Check if the content object has an 'average_rating' field
+    if not hasattr(content_object, 'average_rating'):
+        return
+
+    # Calculate new average
+    # We query the Review model filtering by content_type and object_id
+    avg_rating = Review.objects.filter(
+        content_type=instance.content_type,
+        object_id=instance.object_id
+    ).aggregate(Avg('rating'))['rating__avg']
+
+    # Update field
+    content_object.average_rating = avg_rating or 0  # Default to 0 if no reviews
+    content_object.save(update_fields=['average_rating'])