added print, download as pdf. no puppeteer, we'll see

backend/vehicles/serializers.py

@@ -4,4 +4,10 @@ from .models import Vehicle
 class VehicleSerializer(serializers.ModelSerializer):
     class Meta:
         model = Vehicle
-        fields = ['id', 'vehicle_number', 'trailer1_number', 'trailer2_number', 'driver_pid', 'tare', 'tare_date', 'tare_user', 'gross', 'gross_date', 'gross_user']
+        fields = ['id', 'vehicle_number', 'trailer1_number', 'trailer2_number', 'driver_pid', 'driver_name', 'tare', 'tare_date', 'tare_user', 'gross', 'gross_date', 'gross_user']
+
+    def validate(self, attrs):
+        """Require driver_name on creation only; existing vehicles may have it as NULL."""
+        if self.instance is None and not attrs.get('driver_name'):
+            raise serializers.ValidationError({'driver_name': 'This field is required.'})
+        return attrs