Event created on Pivot Model

[Delvin-MCS]

I have problem in using Event created on pivot model, i want each time the record created the field of 'order_detail_no' is filled based on it's id. But the $orderProduct is returning all the pivot record.
I can use $orderProduct->latest()->first(), but is it good to code like this?

description:
Order table and relation many to many to Product table (intermediate table i named order_details)

In order table i have field 'order_no' and it is based on database record id.

for Order Model it is working

and there the attach code

[Delvin-MCS]

well, i guess i have to change the relationship instead of using many to many