D:\envs\mtb>python manage.py makemigrations
It is impossible to add a non-nullable field 'password' to info without specifying a default. This is because the database needs something to populate existing row
s.
Please select a fix:
1) Provide a one-off default now (will be set on all existing rows with a null value for this column)
2) Quit and manually define a default value in models.py.
Select an option:
在输入数据库迁移指令时，提示字段没有默认值，而且没有设置可以为空，会有提示
1）在终端输入默认值
2）自己创建
Select an option: 1
Please enter the default value as valid Python.
The datetime and django.utils.timezone modules are available, so it is possible to provide e.g. timezone.now as a value.
Type 'exit' to exit this prompt
>>> ''
It is impossible to add a non-nullable field 'username' to info without specifying a default. This is because the database needs something to populate existing row
s.
选择1，进入Python，输入一个完整的引号，中级不带空格
Migrations for 'base':
apps\base\migrations\0002_remove_info_name_info_password_info_username.py
- Remove field name from info
- Add field password to info
- Add field username to info
继续执行数据库迁移指令
D:\envs\mtb>python manage.py migrate
Operations to perform:
Apply all migrations: base
Running migrations:
Applying base.0002_remove_info_name_info_password_info_username... OK