`烧瓶数据库迁移`错误

Question

我们正在尝试运行 aflask db migrate并flask db upgrade引发以下错误：

Usage: flask db upgrade [OPTIONS] [REVISION]

Error: The file/path provided (C) does not appear to exist.  Please verify the path 

           is correct.  If app is not on PYTHONPATH, ensure the extension is .py

我们已将应用程序的目录添加到PYTHONPATH环境变量中，但仍然出现错误。任何帮助，将不胜感激。

下面是我们的__init__.py代码。我们错过了什么吗？

import logging

from flask import Flask

from flask_appbuilder import SQLA, AppBuilder

"""

 Logging configuration

"""

logging.basicConfig(format='%(asctime)s:%(levelname)s:%(name)s:%(message)s')

logging.getLogger().setLevel(logging.DEBUG)

app = Flask(__name__)

app.config.from_object('config')

db = SQLA(app)

appbuilder = AppBuilder(app, db.session)

migrate.init_app(app, db)

"""

from sqlalchemy.engine import Engine

from sqlalchemy import event

#Only include this for SQLLite constraints

@event.listens_for(Engine, "connect")

def set_sqlite_pragma(dbapi_connection, connection_record):

    # Will force sqllite contraint foreign keys

    cursor = dbapi_connection.cursor()

    cursor.execute("PRAGMA foreign_keys=ON")

    cursor.close()

"""    

from app import views

Answer 1

我想如果你像你一样使用迁移migrate.init_app(app, db)  您首先必须导入它然后声明它：from flask_migrate import Migratemigrate = Migrate()migrate.init_app(app, db)或者我认为你可以这样做：from flask_migrate import Migratemigrate = Migrate(app, db)