old_contents: """SQLAlchemy models for users"""
  
  
  import flask_user
  
  import backend
  
  db = backend.db
  
  
  class User(db.Model, flask_user.UserMixin):
      """A user account for either a learner or a mentor."""
      __tablename__ = 'users'
  
      id = db.Column(db.Integer, primary_key=True, nullable=False)
      active = db.Column(db.Boolean, nullable=False, default=False, index=True)
      username = db.Column(db.String, nullable=False, unique=True, index=True)
      password = db.Column(db.String, nullable=False, default='', index=True)
  
      name = db.Column(db.String, nullable=True)
      email = db.Column(db.String, nullable=True)
      description = db.Column(db.String, nullable=True)
      avatar_url = db.Column(db.String, nullable=True)
  
      answers = db.relationship("Answer", backref="creator")
  
      missions = db.relationship("Mission", backref="user")
      quests = db.relationship("Quest", backref="user")
      organizations_created = db.relationship("Organization", backref="user")
  
      @property
      def url(self):
          """URL for the resource."""
          return backend.api.url_for(backend.user_views.User, user_id=self.id)
  
new_contents: """SQLAlchemy models for users"""
  
  
  import flask_user
  
  import backend
  
  db = backend.db
  
  
  DEFAULT_AVATAR_URL = 'http://s3.amazonaws.com/%s/default-avatar.jpg' % (
          backend.app.config['S3_BUCKET'])
  
  
  class User(db.Model, flask_user.UserMixin):
      """A user account for either a learner or a mentor."""
      __tablename__ = 'users'
  
      id = db.Column(db.Integer, primary_key=True, nullable=False)
      active = db.Column(db.Boolean, nullable=False, default=False, index=True)
      username = db.Column(db.String, nullable=False, unique=True, index=True)
      password = db.Column(db.String, nullable=False, default='', index=True)
  
      name = db.Column(db.String, nullable=True)
      email = db.Column(db.String, nullable=True)
      description = db.Column(db.String, nullable=True)
      avatar_url = db.Column(
              db.String, nullable=False, default=DEFAULT_AVATAR_URL)
  
      answers = db.relationship("Answer", backref="creator")
  
      missions = db.relationship("Mission", backref="user")
      quests = db.relationship("Quest", backref="user")
      organizations_created = db.relationship("Organization", backref="user")
  
      @property
      def url(self):
          """URL for the resource."""
          return backend.api.url_for(backend.user_views.User, user_id=self.id)
  
subject: add a default avatar url