AttributeError: 'NoneType' object has no attribute 'drivername'
Opened this issue · 6 comments
I am testing the code on Windows 10 but I am getting the following error. Could you please tell me how to correct this issue
AttributeError: 'NoneType' object has no attribute 'drivername'
Traceback (most recent call last)
File "C:\Python38\Lib\site-packages\sqlalchemy\util\_collections.py", line 1020, in __call__
return self.registry[key]
During handling of the above exception, another exception occurred:
File "C:\Python38\Lib\site-packages\flask\app.py", line 2464, in __call__
return self.wsgi_app(environ, start_response)
File "C:\Python38\Lib\site-packages\flask\app.py", line 2450, in wsgi_app
response = self.handle_exception(e)
File "C:\Python38\Lib\site-packages\flask\app.py", line 1867, in handle_exception
reraise(exc_type, exc_value, tb)
File "C:\Python38\Lib\site-packages\flask\_compat.py", line 39, in reraise
raise value
File "C:\Python38\Lib\site-packages\flask\app.py", line 2447, in wsgi_app
response = self.full_dispatch_request()
File "C:\Python38\Lib\site-packages\flask\app.py", line 1952, in full_dispatch_request
rv = self.handle_user_exception(e)
File "C:\Python38\Lib\site-packages\flask\app.py", line 1821, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "C:\Python38\Lib\site-packages\flask\_compat.py", line 39, in reraise
raise value
File "C:\Python38\Lib\site-packages\flask\app.py", line 1950, in full_dispatch_request
rv = self.dispatch_request()
File "C:\Python38\Lib\site-packages\flask\app.py", line 1936, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "C:\Users\mrsst\Desktop\Flask_Blog\flaskblog\main\routes.py", line 11, in home
posts = Post.query.order_by(Post.date_posted.desc()).paginate(page=page, per_page=5)
File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 514, in __get__
return type.query_class(mapper, session=self.sa.session())
File "C:\Python38\Lib\site-packages\sqlalchemy\orm\scoping.py", line 78, in __call__
return self.registry()
File "C:\Python38\Lib\site-packages\sqlalchemy\util\_collections.py", line 1022, in __call__
return self.registry.setdefault(key, self.createfunc())
File "C:\Python38\Lib\site-packages\sqlalchemy\orm\session.py", line 3286, in __call__
return self.class_(**local_kw)
File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 138, in __init__
bind = options.pop('bind', None) or db.engine
File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 943, in engine
return self.get_engine()
File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 962, in get_engine
return connector.get_engine()
File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 555, in get_engine
options = self.get_options(sa_url, echo)
File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 570, in get_options
self._sa.apply_driver_hacks(self._app, sa_url, options)
File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 883, in apply_driver_hacks
if sa_url.drivername.startswith('mysql'):
AttributeError: 'NoneType' object has no attribute 'drivername'
This issue has been fixed. In the config.py file:
change the SQLALCHEMY_DATABASE_URI line with this SQLALCHEMY_DATABASE_URI = 'sqlite:///site.db'
thank you bro
Wouldn't call this a fix as such. Want to be able to read URI from an OS variable & then register with the Flask app. I can get the app to work if I make literal strings in the Config class. No so great for MAIL_USERNAME, MAIL_PASSWORD etc. os.getenv(whatever) works OK with simple print(whatever) test. app.config[] values don't seem to make it past this point app.config.from_object(Config) in init.py
I am testing the code on Windows 10 but I am getting the following error. Could you please tell me how to correct this issue
AttributeError: 'NoneType' object has no attribute 'drivername'
Traceback (most recent call last)
File "C:\Python38\Lib\site-packages\sqlalchemy\util\_collections.py", line 1020, in __call__ return self.registry[key] During handling of the above exception, another exception occurred: File "C:\Python38\Lib\site-packages\flask\app.py", line 2464, in __call__ return self.wsgi_app(environ, start_response) File "C:\Python38\Lib\site-packages\flask\app.py", line 2450, in wsgi_app response = self.handle_exception(e) File "C:\Python38\Lib\site-packages\flask\app.py", line 1867, in handle_exception reraise(exc_type, exc_value, tb) File "C:\Python38\Lib\site-packages\flask\_compat.py", line 39, in reraise raise value File "C:\Python38\Lib\site-packages\flask\app.py", line 2447, in wsgi_app response = self.full_dispatch_request() File "C:\Python38\Lib\site-packages\flask\app.py", line 1952, in full_dispatch_request rv = self.handle_user_exception(e) File "C:\Python38\Lib\site-packages\flask\app.py", line 1821, in handle_user_exception reraise(exc_type, exc_value, tb) File "C:\Python38\Lib\site-packages\flask\_compat.py", line 39, in reraise raise value File "C:\Python38\Lib\site-packages\flask\app.py", line 1950, in full_dispatch_request rv = self.dispatch_request() File "C:\Python38\Lib\site-packages\flask\app.py", line 1936, in dispatch_request return self.view_functions[rule.endpoint](**req.view_args) File "C:\Users\mrsst\Desktop\Flask_Blog\flaskblog\main\routes.py", line 11, in home posts = Post.query.order_by(Post.date_posted.desc()).paginate(page=page, per_page=5) File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 514, in __get__ return type.query_class(mapper, session=self.sa.session()) File "C:\Python38\Lib\site-packages\sqlalchemy\orm\scoping.py", line 78, in __call__ return self.registry() File "C:\Python38\Lib\site-packages\sqlalchemy\util\_collections.py", line 1022, in __call__ return self.registry.setdefault(key, self.createfunc()) File "C:\Python38\Lib\site-packages\sqlalchemy\orm\session.py", line 3286, in __call__ return self.class_(**local_kw) File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 138, in __init__ bind = options.pop('bind', None) or db.engine File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 943, in engine return self.get_engine() File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 962, in get_engine return connector.get_engine() File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 555, in get_engine options = self.get_options(sa_url, echo) File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 570, in get_options self._sa.apply_driver_hacks(self._app, sa_url, options) File "C:\Python38\Lib\site-packages\flask_sqlalchemy\__init__.py", line 883, in apply_driver_hacks if sa_url.drivername.startswith('mysql'): AttributeError: 'NoneType' object has no attribute 'drivername'
Do one thing set variables in windows environment variable and save. then close terminal close editor and restart them. It will work.
if you have correctly set the environment variable in the .bash_proflie
export EMAIL_USER='youremail@gmail.com'
export EMAIL_PASS='Yourpassword'
export SQLALCHEMY_DATABASE_URI='sqlite:///site.db'
export SECRET_KEY='secretkeyxxxxxxxxxxxxxxxx'
then try restarting your computer.
if it still fails Try to create the database in python
from your yourflaskapp import db
db.create_all()
If your app is in blueprints
use from yourapp import create_app
app = create_app()
app.app_context().push()
Always refresh your text editor and the terminal after making changes. Also try to make sure you are running your app in the right directory.
for more info visit on blueprints use
putting the following lines back into the bottom-most init file, fixed it for me:
app.config['SECRET_KEY'] = '24b85705923df...'
app.config['SQLALCHEMY_DATABASE_URI'] = 'sqlite:///site.db'