INFO [alembic.env] No changes in schema detected.

使用Flask-Migrate的flask db migrate命令后，并没有按照我预想的那样，生成对应的版本文件，反而给了这么一条信息。

我的模型文件

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True, autoincrement=True, nullable=False)
    name = db.Column(db.String(128), nullable=False)
    password = db.Column(db.String(128), nullable=False)

    def __str__(self):
        return f'用户名是：{self.username}，密码是：{self.password}'

我的app文件

from apps import create_app
from flask_migrate import Migrate
from extend import db

app = create_app()
migrate = Migrate(app=app, db=db)


@app.route('/')
def hello_world():  # put application's code here
    return 'Hello World!'


if __name__ == '__main__':
    app.run()

尝试

PS E:\Projects-Pycharm\flaskProject1> flask db init   
Creating directory E:\Projects-Pycharm\flaskProject1\migrations ...  done
Creating directory E:\Projects-Pycharm\flaskProject1\migrations\versions ...  done
Generating E:\Projects-Pycharm\flaskProject1\migrations\alembic.ini ...  done
Generating E:\Projects-Pycharm\flaskProject1\migrations\env.py ...  done
Generating E:\Projects-Pycharm\flaskProject1\migrations\README ...  done
Generating E:\Projects-Pycharm\flaskProject1\migrations\script.py.mako ...  done
Please edit configuration/connection/logging settings in 'E:\\Projects-Pycharm\\flaskProject1\\migrations\\alembic.ini' before proceeding.
PS E:\Projects-Pycharm\flaskProject1> flask db migrate
INFO  [alembic.runtime.migration] Context impl MySQLImpl.
INFO  [alembic.runtime.migration] Will assume non-transactional DDL.
INFO  [alembic.env] No changes in schema detected.

 migration文件夹生成了，但当我准备迁移同步的时候，却没有效果

解决方式

 重点重点重点，模型类写完后需要导入到app文件中

from apps.user.model import User      # 重点，写了模型之后，需要导入

虽然在Pycharm中这个导入语句是灰色的，但必不可少！