在Django中迁移后更改字段的默认值

Question

I have app in django 1.11 and I made migration. Now I have items in admin panel with 'John' in first_name and 'Smith' in last_name field. I would like to change it. Can I do this after made python manage.py migrate ?

operations = [
    migrations.AddField(
        model_name='downloadlink',
        name='company',
        field=models.CharField(default='Company', max_length=500),
        preserve_default=False,
    ),
    migrations.AddField(
        model_name='downloadlink',
        name='first_name',
        field=models.CharField(default='John', max_length=500),
        preserve_default=False,
    ),
    migrations.AddField(
        model_name='downloadlink',
        name='last_name',
        field=models.CharField(default='Smith', max_length=500),
        preserve_default=False,
    ),
]

Answer 1

Just follow these steps,

Step1 . Revert all migartions of app by python manage.py migrate app_name zero
Step2 . Edit the migration file and save
Step3 . Migrate the database again by, python manage.py migarate app_name

Answer 2

Yes. You can make the changes in the admin console, which is usually accessed at localhost:8000/admin. You will have to click on the Model in the admin console and make the changes for the instance.