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POFlask-Mail breaks Celery
 

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    <p>I've got a Flask app where celery works fine and Flask-Mail on its own works fine as well.</p> <pre><code>from celery import Celery from flask_mail import Mail, Message app = Flask(__name__) mail = Mail(app) celery = Celery('main_app', broker='mongodb://localhost', backend='mongodb://localhost') @celery.task def cel_test(): return 'cel_test' @app.route('/works_maybe') def works_maybe(): return cel_test.delay() </code></pre> <h1>SO FAR, SO GOOD</h1> <p>cel_test works fine with the celery worker; everything shows up in mongo.</p> <p>But here's where it gets weird. The "signup" plus mail method works 100% without <code>@celery.task</code>, but blows up when it becomes a task.</p> <pre><code>@celery.task def send_email(some_arg, name, email): msg = Message(…message details..) return mail.send(msg) @app.route("/signup", methods=['POST']) def signup(): return send_email.delay(...stuff for the message…) </code></pre> <h1>THE TRACE</h1> <pre><code>R = retval = fun(*args, **kwargs) File "/Users/username/pymods/virtualenvs/directory/lib/python2.7/site-packages/celery-3.0.15-py2.7.egg/celery/task/trace.py", line 415, in __protected_call__ return self.run(*args, **kwargs) File "/Users/username/pymods/directory/directory/main_app/main_app.py", line 43, in send_email something = 'a string in the Message'), File "/Users/username/pymods/virtualenvs/directory/lib/python2.7/site-packages/flask/templating.py", line 123, in render_template ctx.app.update_template_context(context) AttributeError: 'NoneType' object has no attribute 'app' </code></pre> <p>Could someone explain why in one case celery works great but when I involve mail.send(msg) it breaks?</p> <p>Perhaps there is something I need to learn with python more generally?</p> <p>Any thoughts, if at least as to approach to this type of issue would be greatly appreciated.</p>
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    1. COdo you try `app = Flask(__name__) celery = Celery(__name__) celery.conf.add_defaults(app.config)`?
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    2. COOk, we're getting somewhere. Now the worker raises: `[2013-02-23 15:59:52,093: ERROR/MainProcess] Received unregistered task of type '__main__.send_email'` And KeyError: '__main__.send_email'` Which is strange given that `print celery.tasks` shows `<@task: __main__.send_email>` Which perhaps implies it *is* registered.
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