'application not registered on db instance' 用户 table 截断后

Question

我在测试期间删除了用户 table 中的所有信息。现在，当我尝试运行一个 manage.py 命令来重新创建管理员用户时，我得到 RuntimeError: application not registered on db instance and no application bound to current context。我一直在阅读有关 Flask 上下文的信息，尤其是 What is the purpose of Flask's context stacks?，但我不清楚如何解决这个问题。我该如何解决这个错误？

$ python manage.py db create_admin
Traceback (most recent call last):
  File "manage.py", line 58, in <module>
    manager.add_command("create_admin", create_admin())
  File "manage.py", line 47, in create_admin
    confirmed_on=datetime.datetime.now()
  File "c:\envs\virtalenvs\flask_mini\lib\site-packages\sqlalchemy\orm\scoping.py", line 150, in do
    return getattr(self.registry(), name)(*args, **kwargs)
  File "c:\envs\virtalenvs\flask_mini\lib\site-packages\sqlalchemy\util\_collections.py", line 878, in __call__
    return self.registry.setdefault(key, self.createfunc())
  File "c:\envs\virtalenvs\flask_mini\lib\site-packages\flask_sqlalchemy\__init__.py", line 704, in create_session
    return SignallingSession(self, **options)
  File "c:\envs\virtalenvs\flask_mini\lib\site-packages\flask_sqlalchemy\__init__.py", line 149, in __init__
    self.app = db.get_app()
  File "c:\envs\virtalenvs\flask_mini\lib\site-packages\flask_sqlalchemy\__init__.py", line 845, in get_app
    raise RuntimeError('application not registered on db '
RuntimeError: application not registered on db instance and no application bound to current context

manage.py:

import os
from flask_script import Manager
from myflaskapp.app import create_app
from myflaskapp.models.user import User
from myflaskapp.database import db

manager = Manager(app)

@manager.command
def create_admin():
    db.session.add(User(
        username="admin1",
        email="ad@min.com",
        password="admin",
        admin=True,
        confirmed=True,
        confirmed_on=datetime.datetime.now()
    ))
    db.session.commit()

manager.add_command("create_admin", create_admin())
manager.run()

Answer 1

您正在使用 @manager.command，因此您不应同时使用 manager.add_command。完全删除行 manager.add_command('create_admin', create_admin()).

如果您想使用 add_command，请删除 @manager.command 并使用 manager.add_command('create_admin', Command(create_admin))。

您收到错误是因为应用程序上下文仅在管理器运行时处于活动状态，但您过早地调用了该函数。

'application not registered on db instance' 用户 table 截断后

'application not registered on db instance' after user table truncation

python

flask

flask-sqlalchemy

flask-script