fix: DatetimeField use __year report 'int' object has no attribute 'utcoffset'

[waketzheng]

Fix DatetimeField use '__year' report 'int' object has no attribute 'utcoffset'. (#1575)
When config with "use_tz": True, the bug can be reproduced.

[abondar]

Hello!

Please rebase on actual develop branch and add corresponding test, that will show that problem is gone

[waketzheng]

The bug can be reproduce by:

from datetime import datetime

from tortoise import Tortoise, fields, run_async
from tortoise.models import Model


class Event(Model):
    id = fields.IntField(pk=True)
    name = fields.TextField()
    created = fields.DatetimeField(null=True)

    class Meta:
        table = "event"

    def __str__(self):
        return self.name


async def run():
    # url = 'mysql://root:[email protected]:3306/test_year'
    url = "asyncpg://postgres:[email protected]:5432/test_year"
    await Tortoise.init(db_url=url, modules={"models": ["__main__"]}, use_tz=True)
    await Tortoise.generate_schemas()

    event = await Event.create(name="Test", created=datetime.now())
    print(event.created)

    events = await Event.filter(created__year=2024)
    print(events)


if __name__ == "__main__":
    run_async(run())

[coveralls]

Pull Request Test Coverage Report for Build 8856620005

Details

• 7 of 7 (100.0%) changed or added relevant lines in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+0.03%) to 88.469%

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Totals
Change from base Build 8850757408:	0.03%
Covered Lines:	5735
Relevant Lines:	6388

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💛 - Coveralls

[abondar]

Please add such testcase

async def test_filter_by_year(self):
        with patch.dict(os.environ, {"USE_TZ": "True"}):
            obj = await testmodels.DatetimeFields.create(datetime=datetime(year=2024, month=1, day=1))
            filtered_obj = await testmodels.DatetimeFields.filter(datetime__year=2024).first()
            assert obj == filtered_obj

to tests.fields.test_time.TestDatetimeFields

[abondar]

Seems like mssql doesn't support extract syntax, and uses some kind of CONVERT() syntax instead
I think fixing it is out of scope for this PR, so you could just exclude mssql from this testcase

[waketzheng]

@abondar done.