login and register

backend/app/models.py

@@ -2,15 +2,21 @@ from datetime import datetime, timezone
 from typing import Optional
 import sqlalchemy as sa
 import sqlalchemy.orm as so
-from app import db
+from app import db, login
+from werkzeug.security import generate_password_hash, check_password_hash
+from flask_login import UserMixin
 
-class User(db.Model):
+class User(UserMixin, db.Model):
     id: so.Mapped[int] = so.mapped_column(primary_key=True)
     username: so.Mapped[str] = so.mapped_column(sa.String(64), index=True, unique=True)
     email: so.Mapped[str] = so.mapped_column(sa.String(120), index=True, unique=True)
     password_hash: so.Mapped[Optional[str]] = so.mapped_column(sa.String(256))
     posts: so.WriteOnlyMapped['Post'] = so.relationship(back_populates='author')
 
+    def set_password(self, password):
+        self.password_hash = generate_password_hash(password)
+    def check_password(self, password):
+        return check_password_hash(self.password_hash, password)
     def __repr__(self):
         return '<User {}>'.format(self.username)
 
@@ -25,3 +31,6 @@ class Post(db.Model):
         return '<Post {}>'.format(self.body)
 
 
+@login.user_loader
+def load_user(id):
+    return db.session.get(User, int(id))