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Polymorphism

There are different methods to implement Polymorphism. in a relational database. To use Martin Frowler's classification:

• Single Table Inheritance: corresponds to Django's single-table model inheritance.

• Class Table Inheritance corresponds to Django's multi-table model inheritance and Lino adds some tools for using it: Multi-table inheritance.

• Concrete Table Inheritance

Lino also provides methods to make the implementation choice itself transparent (we are working on it: https://gitlab.com/lino-framework/lino/blob/master/docs/tickets/72)

Polymorphism without using MTI:

• See lino.modlib.partners for example.

• lino.core.model.Model.get_typed_instance()