Usage with Tornado (was: No DB associated to model)

from tortoise.models import Model
from tortoise.fields import *

class Tournament(Model):
    id = IntField(pk=True)
    name = TextField()

if __name__ == "__main__":
    from tortoise import Tortoise, run_async


    async def init():
        # Here we create a SQLite DB using file "db.sqlite3"
        #  also specify the app name of "models"
        #  which contain models from "app.models"
        await Tortoise.init(
            db_url='sqlite://otc.db',
            modules={'models': ['model']} # 传入模块名称，本模块名为 model
        )
        # Generate the schema
        await Tortoise.generate_schemas()


    run_async(init())

    async def dps():
        await Tournament.create(name='Another Tournament')

        # Now search for a record
        tour = await Tournament.filter(name__contains='Another').first()
        print(tour.name)
    run_async(dps())

==============================
tortoise.exceptions.ConfigurationError: No DB associated to model

WHY ?

Start with the posted Python example and trace the Tortoise.init configuration and model registration that lead to ConfigurationError: No DB associated to model. Confirm the cause by running the example, then verify that initialization, schema generation, creation, and lookup complete without the error.