python - 属性错误 : type object 'User' has no attribute 'get'

Question

我正在尝试运行我的 Flask 应用程序，但我不断收到以下错误:

AttributeError: type object 'User' has no attribute 'get'

我假设它来 self 的 Models.py 代码:

class User(db.Model):
    __tablename__ = 'users'
    __table_args__ = {'extend_existing': True} 
    id = db.Column(db.Integer, primary_key = True)
    email = db.Column(db.String(64), unique=True, index=True)
    username = db.Column(db.String(64), unique=True, index=True)
    password = db.Column(db.String(128))
    confirmed = db.Column(db.Boolean, default=False)
    #posts = db.relationship('Post', lazy='dynamic')


    def is_active(self):
        return True

    def get_id(self):
        return self.email

    def is_authenticated(self):
        return self.authenticated

    def is_anonymous(self):
        return False


    @login_manager.user_loader
    def load_user(userid):

        return User.get(User.id==userid)

玩玩之后，看起来我可能需要在某处使用以下代码块或以下代码块的变体？:

def get_object(self):
    return self.request.user

或者它的某种类型的衍生物。任何帮助将不胜感激。谢谢!

这是完整的回溯:

 form = PostForm()
[2018-07-06 11:08:23,652] ERROR in app: Exception on /index [GET]
Traceback (most recent call last):
File 
"/Users.../sqlalchemy/sql/elements.py", line 682, in __getattr__
return getattr(self.comparator, key)
AttributeError: 'Comparator' object has no attribute 'request'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "/Users/...python3.6/site-packages/flask/app.py", line 2292, in 
wsgi_app
response = self.full_dispatch_request()
File "/Users/...b/python3.6/site-packages/flask/app.py", line 1815, in 
full_dispatch_request
rv = self.handle_user_exception(e)
File "/Users/...python3.6/site-packages/flask/app.py", line 1718, in 
handle_user_exception
reraise(exc_type, exc_value, tb)
File "/Users//python3.6/site-packages/flask/_compat.py", line 35, in 
reraise
raise value
File "/Users/...python3.6/site-packages/flask/app.py", line 1813, in 
full_dispatch_request
rv = self.dispatch_request()
File "/Users/WilliamStevens//site-packages/flask/app.py", line 1799, in 
dispatch_request
return self.view_functions[rule.endpoint](**req.view_args)
 File "/Users//Documents/deplorable_snowflake/.../views.py", line 52, in 
index
return render_template('frontpage.html', form=form, posts=posts)
File "/Users/.../python3.6/site-packages/flask/templating.py", line 133, 
   in render_template
  ctx.app.update_template_context(context)
    File "/Users/W/python3.6/site-packages/flask/app.py", line 792, in 
   update_template_context
   context.update(func())
    File "/Users/.../flask_login/utils.py", line 368, in 
   _user_context_processor
   return dict(current_user=_get_user())
  File "/Users/.../python3.6/site-packages/flask_login/utils.py", line 
  335, 
  in _get_user
  current_app.login_manager._load_user()
  File "/Users/.../python3.6/site- 
  packages/flask_login/login_manager.py", 
  line 359, in _load_user
  return self.reload_user()
  File "/Users/.../lib/python3.6/site- 
  packages/flask_login/login_manager.py", line 321, in reload_user
   user = self.user_callback(user_id)
   File 
  "/Users/.../models.py", line 53, in load_user
  return User.get(User.id==userid)
  File 
 "/Users/WilliamStevens/.../models.py", line 47, in get
 return self.request.user
    File "/Users/...site-packages/sqlalchemy/sql/elements.py", line 688, 
  in 
 __getattr__
  key)
 AttributeError: Neither 'BinaryExpression' object nor 'Comparator' 
 object has an attribute 'request'

Answer 1

我刚遇到这个问题。 shmee 提出的解决方案对我有用:

1. load_user() 函数不应该是 User 类的一部分，而是它自己的独立函数。
2. load_user() 函数应该调用 User.query.get(user_id)，而不是 User.get(user_id)。
   • 我认为这种混淆是因为 Flask-Login 的文档 has it the latter way从今天开始:return User.get(user_id)。

示例代码:

class User(db.Model, UserMixin):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80), unique=True, nullable=False)
    password = db.Column(db.String(80))

    def __repr__(self):
        return '<User %r>' % self.username


@login_manager.user_loader
def load_user(user_id):
    return User.query.get(user_id)