Django添加模型无法数据迁移解决方法

用Django开发一款博客，按照教程一步步写下来，发现当我创建一个模型blogpost的时候，使用数据迁移

python manage.py migrate

提示

Operations to perform:
  Apply all migrations: admin, contenttypes, auth, sessions
Running migrations:
  No migrations to apply.

最后找到原因是教程中只说在admin里注册了model，但是还需要在settings.py中注册一下

INSTALLED_APPS = [
    'django.contrib.admin',
    'django.contrib.auth',
    'django.contrib.contenttypes',
    'django.contrib.sessions',
    'django.contrib.messages',
    'django.contrib.staticfiles',
    'blogpost'
]

然后执行数据迁移就正确了

Operations to perform:
  Apply all migrations: admin, blogpost, contenttypes, auth, sessions
Running migrations:
  Rendering model states... DONE
  Applying blogpost.0001_initial... OK