How to mark existing db entries in check_boxes list (ActiveAdmin)?

Question

Ruby on Rails

Created a mold for model "B". It has a check_boxes list and other fields.
The check_boxes values ​​are taken from table "A".
As a result, the values ​​are stored in the native table "B" (other fields) + the values ​​from check_boxes in the table "C".
How to make a check so that the check_boxes that are in the "C" table are marked in the form?

Answer 1

api.rubyonrails.org/classes/ActiveRecord/NestedAtt...