Question

我想从我的芹菜工人那里访问我的postgresql数据库。

由于我正在使用工厂模式，我使用https://github.com/mattupstate/overholt/blob/master/overholt/factory.py这个链接来创建我的芹菜工人。

我正在使用celery -A xyz.jobs worker命令启动我的芹菜工作者。

jobs.py档案：

from xyz.models.user import User
from xyz.app import create_celery_app

celery = create_celery_app()

@celery.task()
def do_some_stuff():
    print(User.get_all())

当我从其中一个端点调用此任务时，出现以下错误：

[2018-04-09 10:21:39,530: ERROR/ForkPoolWorker-8] Task xyz.jobs.do_some_stuff[b3a71e41-2335-470f-89b8-f4844c6eba1c] raised unexpected: AttributeError("'NoneType' object has no attribute 'drivername'",)
Traceback (most recent call last):
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/sqlalchemy/util/_collections.py", line 999, in __call__
    return self.registry[key]
KeyError: 4320768832

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/celery/app/trace.py", line 374, in trace_task
    R = retval = fun(*args, **kwargs)
  File "/Users/user/Documents/celeryTest/xyz_backend/xyz/app.py", line 30, in __call__
    return TaskBase.__call__(self, *args, **kwargs)
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/celery/app/trace.py", line 629, in __protected_call__
    return self.run(*args, **kwargs)
  File "/Users/user/Documents/celeryTest/xyz_backend/xyz/jobs.py", line 10, in do_some_stuff
    print(User.get_all())
  File "/Users/user/Documents/celeryTest/xyz_backend/xyz/models/__init__.py", line 47, in get_all
    return db.session.query(cls).filter_by(**kwargs).all()
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/sqlalchemy/orm/scoping.py", line 153, in do
    return getattr(self.registry(), name)(*args, **kwargs)
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/sqlalchemy/util/_collections.py", line 1001, in __call__
    return self.registry.setdefault(key, self.createfunc())
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/sqlalchemy/orm/session.py", line 2950, in __call__
    return self.class_(**local_kw)
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 143, in __init__
    bind = options.pop('bind', None) or db.engine
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 877, in engine
    return self.get_engine()
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 896, in get_engine
    return connector.get_engine()
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 556, in get_engine
    self._sa.apply_driver_hacks(self._app, info, options)
  File "/Users/user/Documents/celeryTest/xyz_backend/venv/lib/python3.6/site-packages/flask_sqlalchemy/__init__.py", line 830, in apply_driver_hacks
    if info.drivername.startswith('mysql'):
AttributeError: 'NoneType' object has no attribute 'drivername'

我假设，问题出在数据库连接上，但无法解决。有什么我想念的吗？

app.py档案：

def create_celery_app(app=None):
    app = app or create_app()
    celery = Celery(__name__, broker=app.config['CELERY_BROKER_URL'])
    celery.conf.update(app.config)
    TaskBase = celery.Task

    class ContextTask(TaskBase):
        abstract = True

        def __call__(self, *args, **kwargs):
            with app.app_context():
                return TaskBase.__call__(self, *args, **kwargs)

    celery.Task = ContextTask
    return celery


def create_app():
    app = Flask(__name__)
    app.config.from_object(Config)
    register_extensions(app)
    register_api(app)

    return app


def register_extensions(app):
    CORS(app)
    db.init_app(app)
    migrate.init_app(app, db)


def register_api(app):
    from xyz.api.user import auth_api_blueprint
    app.register_blueprint(auth_api_blueprint, url_prefix='/auth')

extensions.py档案：

from flask_migrate import Migrate
from flask_sqlalchemy import SQLAlchemy

db = SQLAlchemy()
migrate = Migrate()

Celery Flask数据库连接错误

0 个答案: