The case is:
I want to fill the default value for some fields in the Settings (any settings page/form) which originally (when create new-site) are empty.
But the field may be changed later by user.
So my problems are:
How to check if the field is empty because it is original or because it is intended to be empty by user.
I know that to check if a doc is saved or not we can use __islocal.
But it seems it can’t be used to check the status of singles doctype. Is there any equivalent to __islocal for Singles?
What trigger for the method to set_value should I use?
I can use refresh, onload, or setup if I can check the status of the single doctype. Otherwise it always back to the set_value value when the page is reloaded.
I’m thinking of something equivalent to after_install so only set once.