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

flask實現創建數據庫表，處理The sqlalchemy extension was not registered to the current application報錯的解決文案

# 模板命令三連
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) 

前面加上一行代碼db.init_app(app)

如下：

 

 

然后刪除migrations文件，重新命令三連 ； OK 成功了！