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127.0.0.1 - - [25/Jun/2018 18:06:38] "POST /users/register HTTP/1.1" 500 -
Traceback (most recent call last):
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/app.py", line 2309, in __call__
    return self.wsgi_app(environ, start_response)
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/app.py", line 2295, in wsgi_app
    response = self.handle_exception(e)
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/app.py", line 1741, in handle_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/app.py", line 2292, in wsgi_app
    response = self.full_dispatch_request()
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/app.py", line 1815, in full_dispatch_request
    rv = self.handle_user_exception(e)
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/app.py", line 1718, in handle_user_exception
    reraise(exc_type, exc_value, tb)
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/_compat.py", line 35, in reraise
    raise value
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/app.py", line 1813, in full_dispatch_request
    rv = self.dispatch_request()
  File "/usr/bin/python3./lib/python3.6/site-packages/flask/app.py", line 1799, in dispatch_request
    return self.view_functions[rule.endpoint](**req.view_args)
  File "/root/Desktop/python_practice_price_alert/src/models/users/views.py", line 35, in register_user
    if User.register_user(email, password):
  File "/root/Desktop/python_practice_price_alert/src/models/users/user.py", line 49, in register_user
    User(email, Utils.hashed_password(password)).save_to_db()
  File "/root/Desktop/python_practice_price_alert/src/models/users/user.py", line 63, in save_to_db
    Database.insert("users", self.json)
  File "/root/Desktop/python_practice_price_alert/src/common/database.py", line 15, in insert
    Database.DATABASE[collection].insert(data)
  File "/usr/bin/python3./lib/python3.6/site-packages/pymongo/collection.py", line 2941, in insert
    check_keys, manipulate, write_concern)
  File "/usr/bin/python3./lib/python3.6/site-packages/pymongo/collection.py", line 631, in _insert
    blk.ops = [(message._INSERT, doc) for doc in gen()]
  File "/usr/bin/python3./lib/python3.6/site-packages/pymongo/collection.py", line 631, in <listcomp>
    blk.ops = [(message._INSERT, doc) for doc in gen()]
  File "/usr/bin/python3./lib/python3.6/site-packages/pymongo/collection.py", line 609, in gen
    for doc in docs:
TypeError: 'method' object is not iterable