def allow_migrate(self, db, app_label, **hints):
        for router in self.routers:
            try:
                method = router.allow_migrate
            except __HOLE__:
                # If the router doesn't have a method, skip to the next one.
                continue

            allow = method(db, app_label, **hints)

            if allow is not None:
                return allow
        return True
dataset/ETHPy150Open django/django/django/db/utils.py/ConnectionRouter.allow_migrate