fix: JSONField default value

[Matvey-Guzienko]

No description provided.

[henadzit]

@Matvey-Guzienko, can you please add a test case exposing the issue?

[Matvey-Guzienko]

@Matvey-Guzienko, can you please add a test case exposing the issue?

When adding a new JSONField to the table model and adding default=value, an empty field is created. This pull request solves this problem.

from tortoise import fields
from tortoise.models import Model


class TestModel(Model):
    id = fields.IntField(pk=True)

    testColumn = fields.JSONField(default={“testField”: “testValue”, “testField2”: “testValue2”})

tortoise.exceptions.OperationalError: (1064, “You have an error in your SQL syntax; check the manual that corresponds to your MariaDB server version for the right syntax to use near ‘’ at line 1”)

[henadzit]

@Matvey-Guzienko can you please add a test exposing the issue as part of the PR? Otherwise, there is a chance that the issue will come back as a regression.