Mongoengine: TypeError: __init__() got an unexpected keyword argument

Question

I am using flask-mongoengine extension and I have a User class like this:

class User(db.Document, UserMixin):     
    email = db.StringField(max_length=120,         


        

Answer 1

Try downgrading pymongo.

pip install pymongo==2.8

I was getting this error no matter what and the only way I fixed it was to downgrande pymongo from 3.0 to 2.8.

Answer 2

I know what happened on you code. you should use __str__ instead of using __init__ I have the same problem .now I have solved it . hope I can help you !

Answer 3

I don't know why but I was also keep getting the same error and only after downgrading pymongo from 3.0 to 2.8 it got fixed as David mentioned.

Pymongo should publish a fix for that, it is frustrating and made me waste couple of hours before realizing it.

Answer 4

This because when mongoengine get data from database then it create instance like User(**data) (there are also can be problem with id). So you haven't required password argument there:

{
    'id': ObjectId('51b349aef5ddaf191f2fb12f'), 
    u'email': u'test@test.test',
    u'password_hash': u'12345678123456781234567812345678'
}

Try next User class implementation:

class User(db.Document, UserMixin):
    email = db.StringField(max_length=120, required=True, unique=True)
    password_hash = db.StringField(max_length=80, required=True)
    active = db.BooleanField()
    fb_id = db.StringField(max_length=120, required=False)

    def __init__(self, password=None, **data):
        if password is not None:
            data['password_hash'] = md5.md5(password).hexdigest()
        super(User, self).__init__(**data)

I have next implementation for my project:

class User(db.Document, UserMixin):
    email = EmailField(unique=True, max_length=64, required=True)
    __password = StringField(db_field='password',
                             min_length=HASH_HEX_STRING_LENGTH,
                             max_length=HASH_HEX_STRING_LENGTH,
                             required=True)
    __password_salt = StringField(db_field='password_salt',
                                  min_length=DEFAULT_STRING_LENGTH,
                                  max_length=DEFAULT_STRING_LENGTH,
                                  required=True)

    def update_password(self, password):
        self.__password_salt = get_random_string(DEFAULT_STRING_LENGTH)
        self.__password = get_hash(password + self.__password_salt)
        return self

    def verify_password(self, password):
        return self.__password == get_hash(password + self.__password_salt)