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auto calculation field



meirissa
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Posted 15 September 2016 - 10:16 AM

hallo. i wanna ask about function that can make auto calculation in grocery crud.

for the example : i have some column a, b, and total_a_b. i have used function callback_column but its now work perfectly, callback_column just show the result on the view page and it cant auto save to database. what the function that can refer it?

please help :(

this is my code :