app\models(22).py

#...

class User(db.Model, UserMixin):
  #...
  
  def to_json(self):
    json_user = {
        "id": self.id,
        "name": self.name,
        "email": self.email,
        "about_me": self.about_me,
        "username": self.username,
        "image": self.gravatar(),
        "stream_token": self.stream_user_token()
    }

    return json_user
  
#...