解决Django migrate: Your models in app(s): ‘Mymodelclassname‘ have changes that are not yet reflected

### 执行python manage.py migrate报错
### Django migrate: Your models in app(s): ‘Mymodelclassname‘ have changes that are not yet reflected

### 解决 备份自己的db.sqlite3  重命名为其他名称，再次执行python manage.py migrate就解决了