To encode sum types / subtyping I am attempting to use the table per class strategy, similar to the shared primary keys strategy.

However I am running into a very strange not in scope error when modeling nested inheritance:

The following works and seems to give me what I want (if a bit hacky):

Vehicle

Car
    vehicle VehicleId sql=id
    Primary vehicle

Bike
    vehicle VehicleId sql=id
    Primary vehicle

However it breaks when I append the following to the bottom:

Coupe
    car CarId sql=id
    Primary car

Sedan
    car CarId sql=id
    Primary car

With the following error:

    • Not in scope: type constructor or class ‘VehicleId’
    • In the quasi-quotation:
        [persistLowerCase|

This is with persistent-2.9.2 and persistent-template-2.6.0.