Traceback (most recent call last):
  File "buggy.py", line 31, in <module>
    loop.run_until_complete(init())
  File "/usr/lib/python3.6/asyncio/base_events.py", line 468, in run_until_complete
    return future.result()
  File "buggy.py", line 23, in init
    result = await Tournament.filter(bool_field=True)
  File "…/Code/tortoise-orm/tortoise/queryset.py", line 479, in _execute
    self.query, custom_fields=list(self._annotations.keys())
  File "…/Code/tortoise-orm/tortoise/backends/base/executor.py", line 24, in execute_select
    raw_results = await self.connection.execute_query(str(query))
  File "…/Code/tortoise-orm/tortoise/backends/sqlite/client.py", line 23, in wrapped
    raise OperationalError(exc)
tortoise.exceptions.OperationalError: no such column: true

import asyncio
from tortoise import Tortoise
from tortoise.models import Model
from tortoise import fields

class Tournament(Model):
    id = fields.IntField(pk=True)
    bool_field = fields.BooleanField()

    def __str__(self):
        return self.name

async def init():
    await Tortoise.init(
        db_url='sqlite://:memory:',
        modules={'models': ['__main__']}
    )
    await Tortoise.generate_schemas()
    result = await Tournament.filter(bool_field=True)
    await Tortoise.close_connections()

loop = asyncio.get_event_loop()
loop.run_until_complete(init())