def post(self):
'''
Create a new user (if user exists, error response is returned) from
sent data (user object at JSON format).
'''
if UserManager.getUser():
self.return_failure("User already exists.")
else:
data = self.get_body_as_dict(expectedFields=["name"])
if data:
user = User()
user.name = data['name']
user.save()
user.key = user._id
user.save()
self.return_json(user.toJson(), 201)
else:
self.return_failure(
"Data are not correct. User has not been created.", 400)
