Refactor AlertMixinSerializer to filter out outdated alerts

osidb/serializer.py

@@ -548,13 +548,21 @@ def get_parent_model(self, obj):
 class AlertMixinSerializer(serializers.ModelSerializer):
     """Serializes the alerts in models that implement AlertMixin."""
 
-    alerts = AlertSerializer(many=True, read_only=True)
+    alerts = serializers.SerializerMethodField()
 
     class Meta:
         model = AlertMixin
         abstract = True
         fields = ["alerts"]
 
+    @extend_schema_field(AlertSerializer(many=True))
+    def get_alerts(self, instance):
+        query_set = Alert.objects.filter(
+            object_id=instance.uuid, created_dt__gte=instance.last_validated_dt
+        )
+        serializer = AlertSerializer(query_set, many=True, read_only=True)
+        return serializer.data
+
 
 class AuditSerializer(serializers.ModelSerializer):