Working Example

app/models.py

@@ -1,9 +1,18 @@
-from werkzeug.security import generate_password_hash, check_password_hash
 from flask_login import UserMixin
-from app import login
+from werkzeug.security import check_password_hash, generate_password_hash
+
+from app import db, login
 
 
-class User(UserMixin):
+class User(UserMixin, db.Model):
+    id = db.Column(db.Integer, primary_key=True)
+    username = db.Column(db.String(64), index=True, unique=True)
+    email = db.Column(db.String(120), index=True, unique=True)
+    password_hash = db.Column(db.String(128))
+
+    def __repr__(self):
+        return "<User {}>".format(self.username)
+
     def set_password(self, password):
         self.password_hash = generate_password_hash(password)
 
@@ -13,4 +22,4 @@ class User(UserMixin):
 
 @login.user_loader
 def load_user(id):
-    return 0
+    return User.query.get(int(id))