`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 loggingfrom flask import Flaskfrom 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 Enginefrom sqlalchemy import event#Only include this for SQLLite [e-mail]_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 Migrate

migrate = Migrate()

migrate.init_app(app, db)

或者我认为你可以这样做：

from flask_migrate import Migrate

migrate = Migrate(app, db)