How does tp5 implement a template request function based on ID and return the name of the requested ID?

Question

How to implement template request function in tp5 and return the name of the requested ID

[Product table]: product
----------------- ------
id | name
1 | PC website
2 | Mobile website
3 | Mini program
-------------- ---------

[Customer table]: client
-------------------------- ---------
id | name | product_id
1 | Customer A | ["1","2","3"]
--------- --------------------------


When rendering data in the "Customer Template" list, how to use "prodect_id" "The ID inside gets the name value corresponding to the ID in the "product" table. If it is ajax, there is a delay in returning the data. I want to get it by calling the function method directly through the template; if there are other better methods, I hope you can tell me

Answer 1

It is recommended to create a custom function directly in common.php to solve the problem