Flask REST - UPDATE user model - rest

Question

i am building a REST api with JWT authorization abstracting the user model. So these are some of the functions I define in my user model definition:
def save_to_db(self):
db.session.add(self)
db.session.commit()
def update_db(self):
db.session.commit()
def delete_from_db(self):
db.session.delete(self)
db.session.commit()
and these are the methods:
#jwt_required()
def get(self):
user = UserModel.find_by_email(current_identity.email)
if user:
return user.json(), 200
return {'message': 'User not found'}, 400
def post(self):
data = UserRegister.parser.parse_args()
if UserModel.find_by_email(data['email']):
return {"message": "User already exists"}, 400
user = UserModel(**data)
user.save_to_db()
return user.json(), 200
#jwt_required()
def put(self):
user = UserModel.find_by_email(current_identity.email)
if user:
data = UserRegister.parser.parse_args()
try:
user = UserModel(**data)
user.update_db()
return user.json(), 200
except:
return {'message': 'An error ocurred while inserting user data.'}, 400
Everything is working except the PUT method. It does not store the actual value in the database, I am wondering why.