Getting Relationship before DO is created?

Hi, I am wondering if there is a better solution for the following:
- TourPage has_many Routes has_many Places.
- when clicking on "Create a new Place" the object does not exists yet (it does not have an ID/HasManyID (until it is saved to the database)

Is it possible to get the RouteID within the Place getCMSFields() (that is being called during the form scaffolding before the DO is saved/created)?

As of now I am asking the user to save the object first before showing the relationship dependent fields.

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