运行时错误：在应用程序上下文之外工作。 在我的烧瓶应用程序中

Question

I'm trying to schedule sending email from my flask application with this function :

from apscheduler.scheduler import Scheduler
scheduler = Scheduler()
scheduler.start()

def email_job_scheduling():
    to="abdellah.ala@gmail.com"
    subject="summary projects"
    message="your summary projects"
    send_email(to,subject,message)

scheduler.add_cron_job(email_job_scheduling, day_of_week='tue', hour=12, minute=55)

this is how i declare app in my file init .py, is there any relationship or must i add schedule function in this file.

login_manager = LoginManager()
db = SQLAlchemy()
mail = Mail()

def create_app(config_name):
    app = Flask(__name__, instance_relative_config=True)
    app.config.from_object(app_config[config_name])
    app.config.from_pyfile('config.py')
    app.permanent_session_lifetime = timedelta(minutes=10)

    db.init_app(app)
    mail.init_app(app)
    login_manager.init_app(app)
    return app

but I receive this error,

Debug mode: off * Running on http://127.0.0.1:5000/ (Press CTRL+C to quit) Job "email_job_scheduling (trigger: cron[day_of_week='wed', hour='9', minute='57'], next run at: 2019-12-11 09:57:00)" raised an exception Traceback (most recent call last): File "/home/abdellah/Documents/venv/lib64/python3.6/site-packages/apscheduler/scheduler.py", line 512, in _run_job retval = job.func(*job.args, **job.kwargs) File "/home/abdellah/Documents/SUPPORT-STS/project/app/admin/views.py", line 29, in email_job_scheduling send_email(to,subject,message) File "/home/abdellah/Documents/SUPPORT-STS/project/app/emails.py", line 11, in send_email mail.send(msg) File "/home/abdellah/Documents/venv/lib64/python3.6/site-packages/flask_mail.py", line 491, in send with self.connect() as connection: File "/home/abdellah/Documents/venv/lib64/python3.6/site-packages/flask_mail.py", line 508, in connect return Connection(app.extensions['mail']) File "/home/abdellah/Documents/venv/lib64/python3.6/site-packages/werkze ug/local.py", line 348, in getattr return getattr(self._get_current_object(), name) File "/home/abdellah/Documents/venv/lib64/python3.6/site-packages/werkzeug/local.py", line 307, in _get_current_object return self.__local() File "/home/abdellah/Documents/venv/lib64/python3.6/site-packages/flask/globals.py", line 52, in _find_app raise RuntimeError(_app_ctx_err_msg) RuntimeError: Working outside of application context.

This typically means that you attempted to use functionality that needed to interface with the current application object in some way. To solve this, set up an application context with app.app_context(). See the documentation for more information.

Answer 1

Yes if you have not specified an application context you should create it. This is because it is necessary to define all the necessary resources within the Flask application. The documentation explains perfectly in which cases and how you should use a context application in Flask.

https://flask.palletsprojects.com/en/1.0.x/appcontext/

If you post more code I could be more helpful.

I will try to find a solution by the way:

from flask import g

def email_job_scheduling():
    a = "abdellah.ala@gmail.com"
    subject = "summary projects"
    message = "your summary projects"
    send_email (to, subject, message)

def get_scheduler():
    if "scheduler" is not in g:
    g.scheduler = Scheduler()
    g.scheduler.start()
    returns g.scheduler

with app.app_context(): #add the necessary resources
    scheduler = get_scheduler()
    #add another code if you need to set another resource

#This piece of code I think is in the main
scheduler.add_cron_job (email_job_scheduling, day_of_week = 'tue', now = 12, minute = 55)