Python “迁移”；无章节：'；alembic'&引用；关于；“数据库迁移”；命令

我正在使用Flask Migrate，并试图使用db Migrate命令向数据库中添加一列。以下是设置：

from flask import Flask, render_template, request, session, flash, redirect, url_for
from flask.ext.babel import Babel
from flask.ext.mail import Mail
from flask.ext.script import Manager
from flask.ext.migrate import Migrate, MigrateCommand
from flask.ext.sqlalchemy import SQLAlchemy
from flask.ext.security import Security, SQLAlchemyUserDatastore, \
     UserMixin, RoleMixin, login_required, roles_required
from flask.ext.login import current_user
from forms import UserEditForm
import os, sys, datetime, random, math
basedir = os.path.abspath(os.path.dirname(__file__))

# Create app
application = Flask(__name__)
application.config['DEBUG'] = True
application.config['SECRET_KEY'] = 'super-secret'
application.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///' + os.path.join(basedir, 'app.db')

application.config['DEFAULT_MAIL_SENDER'] = 'info@site.com'
application.config['SECURITY_REGISTERABLE'] = True
application.config['SECURITY_CONFIRMABLE'] = True
application.config['SECURITY_RECOVERABLE'] = True

application.config.from_object('config.email')

application.config['DBPATH'] = os.path.join(basedir, 'app.db')

# Setup mail extension
mail = Mail(application)

# Setup babel
babel = Babel(application)

@babel.localeselector
def get_locale():
    override = request.args.get('lang')

    if override:
        session['lang'] = override

    rv = session.get('lang', 'en')
    return rv

# Create database connection object

db = SQLAlchemy(application)
migrate = Migrate(application, db)

manager = Manager(application)
manager.add_command('db', MigrateCommand)

# Define models
roles_users = db.Table('roles_users',
        db.Column('user_id', db.Integer(), db.ForeignKey('user.id')),
        db.Column('role_id', db.Integer(), db.ForeignKey('role.id')))

class Role(db.Model, RoleMixin):
    id = db.Column(db.Integer(), primary_key=True)
    name = db.Column(db.String(80), unique=True)
    description = db.Column(db.String(255))

class User(db.Model, UserMixin):
    id = db.Column(db.Integer, primary_key=True)
    email = db.Column(db.String(255), unique=True)
    password = db.Column(db.String(255))
    active = db.Column(db.Boolean())
    confirmed_at = db.Column(db.DateTime())
    nickname = db.Column(db.String(255))
    favcolor = db.Column(db.String(255))
    favshape = db.Column(db.String(255))
    favflower = db.Column(db.String(255))
    favband = db.Column(db.String(255)) # <<<--- NEW COLUMN

    roles = db.relationship('Role', secondary=roles_users,
                            backref=db.backref('users', lazy='dynamic'))

    def __str__(self):
        return '<User id=%s email=%s>' % (self.id, self.email)

user_datastore = SQLAlchemyUserDatastore(db, User, Role)
security = Security(application, user_datastore)

# Views
@app.route('/')
def home():
    return render_template('index.html')


if __name__ == '__main__':
    if str(sys.argv[1]) == 'run': 
        application.run(debug=True) #(host='0.0.0.0', debug=True)
    else:
        manager.run()

我也曾在

flask\Scripts

中尝试过这一点，但得到了相同的错误：

python.exe.././application.py db migrate

---

我还尝试将flask迁移到最新版本。

以防将来有人遇到此问题--

---

我没有migrations文件夹，因为我从另一个项目传输了DB文件。所以，当您没有正常运行的迁移文件夹时，就会发生这种情况

我也有这个问题。我的migrations文件夹位于与预期不同的文件夹中。通常，您只需执行以下操作，即可找到相应的目录：

migrate = Migrate(app, db, directory="/path/to/migrations_folder")

但是，如果实例化迁移对象，然后稍后使用db和应用程序进行初始化，则该对象将不起作用：

# This won't work
migrate = Migrate(directory='/path/to/migrations_folder')
migrate.init_app(app, db)

init_app

将目录重写回默认目录。因此，您需要始终在

init\u应用程序

调用中传递目录

# This will
migrate = Migrate()
migrate.init_app(app, db, directory='/path/to/migrations_folder')

---

编辑我提交了一个

你有alembic.ini文件吗？

# This will
migrate = Migrate()
migrate.init_app(app, db, directory='/path/to/migrations_folder')