Let a controller method's output be accessible as a read_only field

Is your feature request related to a problem? Please describe. I have a Review doctype, which has an owner (the default document owner than frappe creates). I want to get the owner’s full name from the API, not the owner’s email address. Something like this:

/api/resource/Review?fields=["business", "remarks", "rating", "owner_full_name"].

Describe the solution you’d like I can create a controller method (owner_full_name(self), maybe), whose output is the owner’s first name, plus their last name. I want to be able to provide this output as a read_only field.

Describe alternatives you’ve considered A linked field, for the user. The linked field could then be used with fetch_from to get one attribute from the user. The problems with it are:

• it is not normal. It would simply duplicate data in the owner field.
• it doesn’t let me get a second attribute from the linked field, or perform any computation on the linked field.
• Existing records would have to be updated, or they will return nothing.

I tried using dot notation as described here, but that didn’t work either.

[gavindsouza]

I doubt it since it’s not a real database field. but you should be able to access it via GET /api/resource/:doctype/:name after #14593

[daraul]

Can I access that age attribute through the API with something like GET /api/resource/Person?fields=["age"]?