Flask - AssertionError: The sqlalchemy extension was not registered to the current application. Please make sure to call init_app() first.解决方案

flask实现创建数据库表，处理The sqlalchemy extension was not registered to the current application报错的解决文案

# 模板命令三连
python manage.py db init   
python manage.py db migrate   
python manage.py db upgrade 

 

 

 

 

先到初始化app

所以，manager = Manager(app) 

前面加上一行代码db.init_app(app)

如下：

 

 

然后删除migrations文件，重新命令三连 ； OK 成功了！