old_contents: from datetime import datetime
  
  from werkzeug.security import generate_password_hash, check_password_hash
  
  from . import db
  
  class User(db.Model):
    __tablename__ = 'users'
    id            = db.Column(db.Integer, primary_key=True, autoincrement=True)
    email         = db.Column(db.String(64), 
                              nullable=False, 
                              unique=True, 
                              index=True)
    username      = db.Column(db.String(64), 
                              nullable=False, 
                              unique=True, 
                              index=True)
    is_admin      = db.Column(db.Boolean)
    password_hash = db.Column(db.String(128))
    name          = db.Column(db.String(64))
    member_since  = db.Column(db.DateTime(), default = datetime.utcnow)
  
    @property
    def password(self):
      raise AttributeError('Password is not a readable attribute')
    
    @password.setter
    def password(self, password):
      self.password_hash = generate_password_hash(password)
  
    def verify_password(self, password):
      return check_password_hash(self.password_hash, password)
  
new_contents: from datetime import datetime
  
  from flask.ext.login import UserMixin
  
  from werkzeug.security import generate_password_hash, check_password_hash
  
  from . import db, login_manager
  
  class User(UserMixin, db.Model):
    __tablename__ = 'users'
    id            = db.Column(db.Integer, primary_key=True, autoincrement=True)
    email         = db.Column(db.String(64), 
                              nullable=False, 
                              unique=True, 
                              index=True)
    username      = db.Column(db.String(64), 
                              nullable=False, 
                              unique=True, 
                              index=True)
    is_admin      = db.Column(db.Boolean)
    password_hash = db.Column(db.String(128))
    name          = db.Column(db.String(64))
    member_since  = db.Column(db.DateTime(), default = datetime.utcnow)
  
    @property
    def password(self):
      raise AttributeError('Password is not a readable attribute')
  
    @login_manager.user_loader
    def load_user(user_id):
      return User.query.get(int(user_id))
    
    @password.setter
    def password(self, password):
      self.password_hash = generate_password_hash(password)
  
    def verify_password(self, password):
      return check_password_hash(self.password_hash, password)
  
subject: Add user_loader function for loading a user