Set default data

[koertho]

Hi, I struggled a little so set (dynamic) default data for a group widget.

Background: I have a bundle where classes define types. These types can define default data (which should be used in a group widget). When I create a new element in the backend and the type is selected, the default data should be set. After a lot of try&error I end up with following solution:

// parent group field onload callback
$request->request->set("widget-group__myField", 1);
$typeModel->myField = serialize([1 => $type->getDefaults()]);
$typeModel->save();

So I have a working solution, but it's not a very nice one. Is there a better way I did not notice?
I also tried load_callbacks, setting default values (dca) for a child group field, using the group field registry and so one.

[m-vo]

There is surely a way to support this, but it's not straightforward, I guess. A solution would need to work with any of the storage engines (including 3rd party), so we would probably need to write the raw values to the StorageInterface directly.

How would your desired solution look like? A DCA setting (like "default => …)?