teach we about query logic in filament

excuse me, I want to create new data but in the input for a unique code that is generated according to its own format and based on data in the database

when we make it using laravel on the controller, we still understand, but because we are still beginners to determine the query on the filament resource, please give directions to us how to make a kind of controller but on the filament

(and also to be honest because there are still a few tutorials on the internet to help us make a query logic on filament)

The following is an example of the unique code that you want to generate

from that example, how to implement at filament when create new data
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