Let the model define the database with a custom router

I'm porting a website from Django 1.6.x to 1.11 and I'm hitting a problem with my custom router. Some models define a custom attribute defining which database it will reside in:

class MyModel(models.Model):
    DATABASE_NAME = "foo"

This worked in our custom router in 1.6.x but not in 1.11. The router accesses it like:

        if hasattr(model,'DATABASE_NAME'):
            return model.DATABASE_NAME == db

Inside the allow_migrate function of my router, the custom attribute DATABASE_NAME doesn't exist in the model in 1.11 but it was there in 1.6.x, if that makes sense.

Any suggestions for a different implementation? I want my models to define the physical database they are in.

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