类型错误：在0x7f86789f9bf8 sqlalchemy.orm.attributes.InstrumentedAttribute对象不是JSON序列化

我使用烧瓶瓶，登录用户认证。烧瓶SQLAlchemy中存储这些车型在SQLite数据库：类型错误：在0x7f86789f9bf8 sqlalchemy.orm.attributes.InstrumentedAttribute对象不是JSON序列化

ROLE_USER = 0 
ROLE_ADMIN = 1 

class Anonymous(AnonymousUserMixin): 
    def __init__(self): 
    self.username = 'Guest' 

lm.anonymous_user = Anonymous 

class User(UserMixin, db.Model): 
__tablename__ = "users" 
id = db.Column(db.Integer, primary_key = True) 
username = db.Column(db.String(64), index = True, unique = True) 
password = db.Column(db.String(20), index = False, unique = True) 
email = db.Column(db.String(120), index = True, unique = True) 
registered_on = db.Column('registered_on' , db.DateTime) 
role = db.Column(db.SmallInteger, default = ROLE_USER) 

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

def get_id(self): 
    return User.id 


class PostVote(db.Model): 
__tablename__ = "postvotes" 
post_id = db.Column(db.Integer, db.ForeignKey('posts.id'), primary_key = True) 
user_id = db.Column(db.Integer, default = 0) 
type = db.Column(db.Boolean, default = True) 

class Post(db.Model): 
__tablename__ = "posts" 
id = db.Column(db.Integer, primary_key = True) 
body = db.Column(db.String(320)) 
points = db.Column(db.Integer, default = 0) 
votes = db.relationship(PostVote) 
timestamp = db.Column(db.DateTime) 
user_id = db.Column(db.Integer, db.ForeignKey('users.id')) 

def __repr__(self): 
    return '<Post %r>' % self.body

我的登录代码：

@app.route('/login', methods = ['GET', 'POST']) 
def init_login(): 
form = LoginForm() 
if request.method == 'GET': 
    return render_template('login/index.html', form = form, active = 'login') 
if form.validate(): 
    uname = form.username.data 
    passw = form.password.data 
    print('DBG: Loginning ' + uname) #for debug purposes 
    registered_user = User.query.filter_by(username = uname).first() 
    if registered_user is None: 
     flash('User not found') 
     return render_template('/login/index.html', form=form, 
     msgtype = 'alert-warning', active = 'login') 
    if check_passw(passw, registered_user.password): 
     login_user(registered_user) 
     session['username'] = uname 
     return redirect(url_for('init_login_success')) 
    else: 
     flash('Incorrect password') 
     return render_template('/login/index.html', form=form, 
     msgtype = 'alert-danger', active = 'login') 
return render_template('login/index.html', form = form, active = 'login')

当我试图登录，SQLAlchemy的触发错误，您可以在文章标题（TypeError: <sqlalchemy.orm.attributes.InstrumentedAttribute object at 0x7f86789f9bf8> is not JSON serializable）见。 AFAIK，InstumentedAttribute用于关系，但它没有帮助我。
我还发现发生该错误则（）执行login_user。登录无需登录即可正常工作。
我怎样才能解决这个问题？

来源

2016-12-26 NeoCortex

这是不是你的问题，但我想提一提的是：默认情况下，支持每个烧瓶取景功能'GET'方法，这样你就不用写'如果request.method ==“GET'' – metmirr

眼下get_id()在文档同时返回一个整数：

get_id()
This method must return a unicode that uniquely identifies this user, and can be used to load the user from the user_loader callback. Note that this must be a unicode - if the ID is natively an int or some other type, you will need to convert it to unicode.

我写了这个要解决的问题：

def get_id(self): 
     return str(self.id)

来源

2016-12-26 13:02:03 NeoCortex

确实提到了，原来是返回类属性'User.id'代替实例属性，因此整个麻烦与InstrumentedA ttribute';它没有返回一个整数。 –

我忘记说了。谢谢。 – NeoCortex

类型错误：在0x7f86789f9bf8 sqlalchemy.orm.attributes.InstrumentedAttribute对象不是JSON序列化

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