@manager.command
def deploy():
    """执行部署任务"""
    from flask_migrate import upgrade
    from app.models import Role, User
    # 把数据库迁移到最新修订版本
    upgrade()
    # 创建用户角色
    Role.insert_roles()
    # 让所有用户都关注此用户
    User.add_self_follows()

class ProductionConfig(Config):
    SQLALCHEMY_DATABASE_URI = os.environ.get(‘DATABASE_URL‘) or ‘sqlite:///‘ + os.path.join(basedir,‘data.sqlite‘)

    @classmethod
    def init_app(cls,app):
        Config.init_app(app)

        # 把错误通过电子邮件发送给管理员
        import logging
        from logging.handlers import SMTPHandler
        credentials = None
        secure = None
        if getattr(cls,‘MAIL_USERNAME‘,None) is not None:
            credentials = (cls.MAIL_USERNAME,cls.MAIL_PASSWORD)
            if getattr(cls,‘MAIL_USE_TLS‘,None):
                secure=()
        mail_handler = SMTPHandler(
            mailhost=(cls.MAIL_SERVER,cls.MAIL_PORT),
            fromaddr=cls.FLASKY_MAIL_SENDER,
            toaddrs=[cls.FLASKY_ADMIN],
            subject=cls.FLASKY_MAIL_SUBJECT_PREFIX+‘Application Error‘,
            credentials=credentials,
            secure=secure
        )
        mail_handler.setLevel(logging.ERROR)
        app.logger.addHandler(mail_handler)