Flask Security, Flask Mail AttributeError: 'NoneType' object has no attribute 'send'

Question

I'm trying to implement the email function inside my Flask admin panel. I've successfully integrated it within my admin panel but the problem is when I try to send any mail, it gives me below error with traceback.

builtins.AttributeError
AttributeError: 'NoneType' object has no attribute 'send'

File 

"/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 2000, in __call__
return self.wsgi_app(environ, start_response)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1991, in wsgi_app
response = self.make_response(self.handle_exception(e))
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1567, in handle_exception
reraise(exc_type, exc_value, tb)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
raise value
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1988, in wsgi_app
response = self.full_dispatch_request()
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1641, in full_dispatch_request
rv = self.handle_user_exception(e)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1544, in handle_user_exception
reraise(exc_type, exc_value, tb)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/_compat.py", line 33, in reraise
raise value
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1639, in full_dispatch_request
rv = self.dispatch_request()
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask/app.py", line 1625, in dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask_admin/base.py", line 69, in inner
return self._run_view(f, *args, **kwargs)
File "/Library/Frameworks/Python.framework/Versions/3.5/lib/python3.5/site-packages/flask_admin/base.py", line 368, in _run_view
return fn(self, *args, **kwargs)
File "/Users/genomics/PycharmProjects/side_project_one/app/security_layer.py", line 44, in index
send_email(admin_form.subject.data, admin_form.sender.data, [i], admin_form.content.data, None)
File "/Users/genomics/PycharmProjects/side_project_one/app/views/send_email.py", line 41, in send_email
mail.send(msg)
AttributeError: 'NoneType' object has no attribute 'send'

send_email.py

mail = None
def configure_mail(app):
    # EMAIL SETTINGS
    global mail
    app.config.update(
        MAIL_SERVER='smtp.gmail.com',
        MAIL_PORT=587,
        MAIL_USE_SSL=False,
        MAIL_USERNAME='xxxx',
        MAIL_PASSWORD='xxxx',
        MAIL_USE_TLS=True,
        DEFAULT_MAIL_SENDER='Danny from DPC'
        #SECRET_KEY='abcdefd_thats_a_charming_secret_key',

    )
    mail = Mail(app)


def send_email(subject, sender, recipients, text_body, html_body):

    msg = Message(subject, sender=sender, recipients=recipients)

    msg.body = text_body
    msg.html = html_body
    mail.send(msg)

flask_security.py

from app.views.login_forms import AdminForm
from app.views.send_email import send_email

class EmailRegisterView(BaseView):

  def is_accessible(self):
     if not current_user.is_active or not current_user.is_authenticated:
         return False

     if current_user.has_role('admin_danny'):
         return True
     return False

 @expose('/', methods=['GET', 'POST'])
 def index(self):
     admin_form = AdminForm()
     if request.method == 'POST':
         if admin_form.validate_on_submit():
             recipients = [admin_form.recipient.data]
             divided_recipients = recipients[0].split(',')
             for i in divided_recipients:
                 send_email(admin_form.subject.data, admin_form.sender.data, [i], admin_form.content.data, None)
     return self.render('admin.html', form=admin_form)

Answer 1

Ok, I found a solution.

So my importing structure was wrong

Inside def configure_mail, I have mail = Mail(app) set as global variable.

And that mail variable was not doing anything. So what I did is, inside my app.init

app.config.update(
MAIL_SERVER='smtp.gmail.com',
MAIL_PORT=587,
MAIL_USE_SSL=False,
MAIL_USERNAME='something',
MAIL_PASSWORD='xxxxxx',
MAIL_USE_TLS=True,
DEFAULT_MAIL_SENDER='Danny from DPC'
# SECRET_KEY='abcdefd_thats_a_charming_secret_key',

)

mail = Mail(app)

and I called this above mail into send_email.py and everything is working fine. I still can't figure out what the exact error was but this did the trick.