String require a length on dialect mysql

[Jasonloe]

Hi，All：
I have specified String length in ORM, but after initialization and migration, an error is reported when upgarde。
Example:
class User(db,Model):
tablename = 'user'
name = db.Column(db.String(64))
after init
in path: /migrations/versions/xxxxxxx.py
sa.Column('name', sa.String())
do flask db upgrade there is an error: sqlalchemy.exc.ComplieError: (in table 'user',column 'name'):String require a length on dialect mysql
how to fix this？Thanks

[miguelgrinberg]

This is an error in your migration script, not your model. Fix the script and you should be fine, I think.