Mongoengine AttributeError

Question

我正在尝试使用Flask-Mongoengine和Flask-Login为应用程序编写授权代码。我得到了一个奇怪的错误：

File "/usr/lib/python3.5/site-packages/mongoengine/base/document.py", line 188, in __setattr__
    super(BaseDocument, self).__setattr__(name, value)
  File "/usr/lib/python3.5/site-packages/mongoengine/base/fields.py", line 132, in __set__
    if instance._initialised:
AttributeError: _initialised

我的models.py：

from app import app, db
from flask.ext.login import LoginManager


login_manager = LoginManager()
login_manager.init_app(app)


class User(db.Document):
    email = db.StringField(required=True)
    first_name = db.StringField(max_lenght=40, required=True)
    last_name = db.StringField(max_lenght=40, required=True)
    password = db.StringField(required=True)

    def __init__(self, email, first_name, last_name, password):
        self.email = email
        self.first_name = first_name
        self.last_name = last_name
        self.password = password

    def is_authenticated(self):
        return True

    def is_active(self):
        return True

    def is_anonymous(self):
        return False

   def get_id(self):
        return self.email

我试着提高这门课的成绩，但没用。

https://github.com/MongoEngine/flask-mongoengine/issues/156

Answer 1

Mongoengine不需要你定义一个__init__。

class User(db.Document):
    email = db.StringField(required=True)
    first_name = db.StringField(max_lenght=40, required=True)
    last_name = db.StringField(max_lenght=40, required=True)
    password = db.StringField(required=True)

    def clean(self):
        # clean will be called when you call .save()
        # You can do whatever you'd like to clean data before save
        self.password = str(self.password)

那么你所要做的就是

user = User(email='email@gmail', first_name='hello', last_name='there', password=2342143213)
user.save()
print(user.id)

Answer 2

这个问题的修复方法是，您需要像这样调用超类的构造函数

class User(db.Document):
    email = db.StringField(required=True)
    first_name = db.StringField(max_lenght=40, required=True)
    last_name = db.StringField(max_lenght=40, required=True)
    password = db.StringField(required=True)

    def __init__(self, email, first_name, last_name, password, *args, **kwargs):
        super(User, self).__init__(*args, **kwargs)
        self.email = email
        self.first_name = first_name
        self.last_name = last_name
        self.password = password

    def is_authenticated(self):
        return True

    def is_active(self):
        return True

    def is_anonymous(self):
        return False

   def get_id(self):
        return self.email

Answer 3

未来的读者应该比在knittledan answer中更清楚，clean()是在每次 save()调用之前调用的，所以如果它被用来散列模型中的密码字段，例如：

def clean(self):
    self.password = bcrypt.generate_password_hash(self.password).decode('utf-8')

密码将不断被覆盖，这不是我们所希望的。一种解决方法是使用附加字段，例如：password_hashed = db.BooleanField(default=False)

def clean(self):
    if not self.password_hashed:
        self.password        = bcrypt.generate_password_hash(self.password).decode('utf-8')
        self.password_hashed = True