Forms: How to change data before saving - across ALL form fields?

[Estigy]

Package

Panel builder

Package Version

v4

How can we help you?

I have a form where the value of a field (let's call it "A") in the main form is dependent on the value of a field within a 1:1 relationship (let's call it "B") in such a way that the value of field "A" needs to be adopted before saving.
(Field "A" is a multiselect, and if field "B" has a certain value, "A" shall store one more value in the DB that would not be accessible otherwise. This setup was not my decision ;-) )

My form has a section() that handles the relationship, and this works flawlessly, with the only caveat being that I don't know how to access the value of field "B" in order to change the value of field "A" before it's being stored:

1. When I call dehydrateStateUsing() on form element "B", I only see the section's data for the 1:1 relationship.
2. When I add mutateFormDataBeforeSave() to the Edit page of the entity, I only see the main form's data.

Another solution I could think of would be to not use the "relation" feature of the Section at all, and use handleRecordUpdate() to handle the 1:1 relationship by myself. But if there was a more "filamenty" solution, I would of course prefer that ;-)

(I really need to have the correct value before the entity is being saved, because the DB has a trigger that listens for the stored value. So I can't simply add one value and later save it again with another one.)

Please could somebody point me in the right direction? :-)

[Estigy]

Nevermind... I can access the relationship's form fields by injecting the Get $get parameter into dehydrateStateUsing() and using dot-notation to access the field like so: $get('relation.field')

Most of the times the solutions pop up right after sending the call for help ;-)