I have the next requirement and I not finding any clean way in the documentation to implement it.
Basically, we need a new field © which value must be filled with the content of another two fields (A and B) under the criteria of taking A if is not empty or B otherwise.
The field C will be hidden so the editor can’t tamper with it.
There is something similar to a custom interceptor class that would allow me to change the value after the customer save the content?
Thanks for your help in advance