How can I solve this error from flask-admin extension when creating a ModelView?

Question

I am going through the flask-admin tutorial.

As the tutorial explains, when I create an instance of ModelView for my User model by using

admin.add_view(ModelView(User, db.session))

I get an error which is: AttributeError: 'ColumnProperty' object has no attribute 'expression'

and when I create an instance of ModelView for my Account model by using:

admin.add_view(ModelView(Account, db.session))

I get an error: Exception: Model Account does not have primary key.

My User model code is:

class User(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    username = db.Column(db.String(80))
    email = db.Column(db.String(160))
    password = db.Column(db.String(100))
    account_id = db.Column(db.Integer, db.ForeignKey('account.id'))
    account = db.relationship('Account', backref=db.backref('user', lazy='dynamic'))

Account model code is:

class Account(db.Model):
    id = db.Column(db.Integer, primary_key=True)
    password = db.Column(db.String(100))

stack trace when creating User ModelView: http://pastebin.com/gf200CHp

stack trace when creating Account ModelView: http://pastebin.com/NYhGBW1Z

I am using flask-sqlalchemy for creating models. Can someone please suggest how to solve these errors?

Answer 1

I got the same Model ... does not have primary key exception, but it went away after I upgraded SQLAlchemy from 0.7.10 to 0.8.2:

sudo pip install SQLAlchemy==0.8.2

-Cheers!