Adding new a CharEnumField to existing table throws OperationError upon migration

[bhch]

Steps to reproduce:

• Step 1: Create model

class MyModel(Model):
    name = fields.CharField(max_length=10)

• Step 2: Create migration and upgrade

$ aerich migrate && aerich upgrade

• Step 3: Add a new enum field on the model

class Colors(Enum):
    blue = 'blue'
    green = 'green'

class MyModel(Model):
    name = fields.CharField(max_length=10)
    color = fields.CharEnumField(max_length=5, default=Colors.blue)  # new field

• Step 4: Migrate and upgrade

$ aerich migrate && aerich upgrade

This throws this error:

tortoise.exceptions.OperationalError: value too long for type character varying(5)

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Possible causes of error

Looking at the generated migration statement, we can see that it's using the incorrect default value.

-- generated by aerich

ALTER TABLE "mymodel" ADD "color2" VARCHAR(5) NOT NULL  DEFAULT 'Colors.blue';